JP2011186771A - Arithmetic unit and program - Google Patents

Abstract

An object of the present invention is to improve the learning effect of a user by making it possible to evaluate whether or not the solution unit of a calculation formula is a correct physical unit.
A storage unit that stores a proper unit table that stores a predetermined unit as a proper unit, a display unit that displays a numerical value or character with a unit as a constituent element, and a display unit that displays the calculation unit. If the CPU 11 obtains the solution of the calculated expression by calculation and the unit of the solution of the calculation expression obtained by the CPU 11 does not match any appropriate unit stored in the appropriate unit table 71, this is displayed. And a display unit 15.
[Selection] Figure 2

Description

The present invention relates to an arithmetic device and a program.

  2. Description of the Related Art In recent years, a small electronic computer called a scientific calculator that can perform various types of calculation processing such as function calculation has been used for learning of calculation.

  As a technique related to the scientific calculator, a physical unit corresponding to each of the left side and the right side of an equation consisting of a character expression (character expression used in the field of physics) is obtained from a table in which the character expression and the physical unit are associated, A technique for determining whether an equation is correct or not by determining whether or not they match is known (see, for example, Patent Document 1).

JP 2000-163381 A

  However, in the technique of the above-mentioned Patent Document 1, it is possible to determine whether a character expression is correct or incorrect by matching or mismatching of physical units. However, when a calculation formula with physical units is input, the physical unit of the solution is appropriate. It was not possible to evaluate whether it was a physical unit.

  Here, in the field of education (especially in the fields of physics and chemistry), a correct understanding of physical units is very important. However, some users (students) do not have a correct understanding of physical units. Such a user may enter an incorrect calculation formula into the scientific calculator. For example, in the calculation of gravity, a calculation formula of 3 [kg] × 9.8 [m / s ^ 2] (^ indicates a power with the following numerical value as an exponent) is input. It is also conceivable that an incorrect calculation formula (for example, 3 [kg] ÷ 9.8 [m / s ^ 2]) is input. In this case, the physical unit [kg · s ^ 2 / m] of the solution of the calculation formula input by the user is not an appropriate physical unit to be obtained (the appropriate physical unit is [kg · m / s ^ 2]).

  In such a case, the conventional technique evaluates whether or not the physical unit of the solution of the calculation formula is an appropriate physical unit, and based on the evaluation, the user determines that the input calculation formula is incorrect. There is no function to inform. For this reason, the user cannot notice an error in the input of the calculation formula, and cannot obtain an opportunity to acquire correct knowledge about the physical unit. That is, the user's learning effect could not be enhanced.

  An object of the present invention is to provide an arithmetic device and a program capable of enhancing a user's learning effect by enabling evaluation of whether a physical unit of a solution of a calculation formula is an appropriate physical unit. Objective.

In order to solve the above problems, an arithmetic device according to claim 1 is provided:
An appropriate unit storage means for storing a predetermined unit as an appropriate unit;
Formula display means for displaying a calculation formula including a numerical value or a character with a unit as a constituent element;
A calculation means for calculating a solution of the calculation formula displayed on the formula display means;
When the unit of the solution of the calculation formula obtained by the calculation means does not match any appropriate unit stored by the appropriate unit storage means, a determination result display means for displaying the fact is provided.

According to a second aspect of the present invention, in the arithmetic device according to the first aspect,
A conversion means for converting a unit other than the SI unit system into an SI unit when the calculation formula includes a unit other than the SI unit system;
A conversion expression creating means for creating a conversion expression including the SI unit converted by the conversion means;
A conversion formula calculation means for calculating a solution of the conversion formula created by the conversion formula creation means;
Conversion formula solution display means for displaying a solution of the conversion formula obtained by the conversion formula calculation means.

The invention according to claim 3 is the arithmetic unit according to claim 2,
When the calculation formula includes a unit other than the SI unit system, a calculation formula calculation means for calculating a solution of the calculation formula without converting a unit other than the SI unit system into an SI unit;
Solution display means for displaying the solution of the calculation formula obtained by the calculation formula calculation means and the solution of the conversion formula calculated by the conversion formula calculation means.

According to a fourth aspect of the present invention, in the arithmetic device according to the second or third aspect,
When at least one of the solution of the calculation formula and the solution of the conversion formula includes an assembly unit in which a basic unit of the SI unit system is assembled, the assembly unit is converted into a unit having a unique name representing the assembly unit. Unit conversion means;
Specific name display means for displaying a unit consisting of the unique name converted by the unit conversion means.

The invention according to claim 5 is the arithmetic device according to claim 3 or 4,
The unit of solution of the calculation formula does not match any appropriate unit stored by the appropriate unit storage means, and the unit element of the solution of the calculation formula is the same as the unit element of the unit stored in the appropriate unit storage means In the case of the configuration, a candidate display unit is provided for displaying the calculation formula candidate in which the unit of the solution of the calculation formula is an appropriate physical unit.

The invention according to claim 6 is the arithmetic device according to any one of claims 1 to 5,
Input means for selectively inputting at least one of a unit included in the calculation formula, a dimension corresponding to the unit, and a prefix corresponding to the unit.

The program of the invention described in claim 7 is:
Computer
An appropriate unit storage means for storing a predetermined unit as an appropriate unit;
Formula display means for displaying a calculation formula including a numerical value or a character with a unit as a component,
Calculation means for obtaining a solution of the calculation formula displayed on the expression display means by calculation,
When the unit of the solution of the calculation formula obtained by the calculation means does not match any appropriate unit stored by the appropriate unit storage means, a determination result display means for displaying that effect,
To function as.

  ADVANTAGE OF THE INVENTION According to this invention, a user's learning effect can be heightened by enabling evaluation of whether the physical unit of the solution of a formula is an appropriate physical unit.

It is a figure which shows schematic structure of the scientific calculator of embodiment which concerns on this invention. It is a figure which shows the internal structure of a scientific calculator. It is a figure which shows a unit call table. It is a figure which shows SI unit conversion table. It is a figure which shows a prefix table. It is a figure which shows an assembly unit conversion table. It is a figure which shows an appropriate unit table. It is a flowchart which shows the flow of a unit discrimination | determination process. It is a flowchart which shows the flow of a calculation formula input process. It is a flowchart which shows the flow of a solution output process. It is FIG. (1) which shows the display operation accompanying a unit discrimination | determination process. It is FIG. (2) which shows the display operation accompanying a unit discrimination | determination process. FIG. 10 is a diagram (No. 3) illustrating a display operation associated with unit determination processing. It is FIG. (4) which shows the display operation accompanying a unit discrimination | determination process. It is FIG. (5) which shows the display operation accompanying a unit discrimination | determination process. It is FIG. (6) which shows the display operation accompanying a unit discrimination | determination process. It is a figure which shows the display operation when a character type | formula is input.

  Hereinafter, an example of an embodiment according to the present invention will be described in detail with reference to the accompanying drawings. However, the scope of the invention is not limited to the illustrated examples.

  Embodiments according to the present invention will be described with reference to FIGS. First, with reference to FIG. 1, the schematic of the scientific calculator 1 as an arithmetic unit which concerns on this invention is demonstrated. As shown in FIG. 1, the scientific calculator 1 includes an input key group 2 having various key groups and a display 3.

  The input key group 2 is a key group for receiving an input operation of a mathematical expression component such as a numerical value or an arithmetic symbol from a user or an instruction operation of various processes, and a plurality of keys each assigned a unique function. Has a key.

The display 3 is an LCD (Liquid Crystal Display) or ELD (Electronic).
Luminescent Display). Specifically, the display 3 displays various data necessary for using the scientific calculator 1 in addition to characters, symbols, mathematical expressions, and calculation results according to the operation of an input pen (not shown) or the input key group 2. indicate. In addition, the display 3 is integrally provided with a touch panel 14F (see FIG. 2) over the entire display screen.

  Next, the internal configuration of the scientific calculator 1 will be described with reference to FIG. The scientific calculator 1 includes a CPU (Central Processing Unit) 11 that is a control unit, a RAM (Random Access Memory) 12 that is a main storage unit, a storage unit 13, an input unit 14, and a display unit 15. It is configured.

  The CPU 11 centrally controls each part of the scientific calculator 1. Specifically, the CPU 11 expands a program specified from the system program and various application programs stored in the storage unit 13 in the RAM 12 and performs various processes in cooperation with the program expanded in the RAM 12. Execute.

  Specifically, the CPU 11 obtains a solution of the calculation formula displayed on the display unit 15 by calculation in cooperation with a program for performing unit determination processing described later, and the solution of the calculated calculation formula is an appropriate unit. If it does not match any of the appropriate units stored in the table 71, a message to that effect (for example, an error display as shown in FIG. 14 (h) or FIG. 15 (b) described later) is displayed on the display unit 15.

  The RAM 12 is a volatile memory that temporarily stores information, and has a plurality of work areas that store various programs to be executed and data related to these various programs.

  The storage unit 13 is a non-volatile memory configured by a ROM (Read Only Memory) or the like. The storage unit 13 stores various data including various processing programs 13A and a unit table 13B. The various processing programs 13A include a program (see FIG. 8) for performing unit determination processing described later. The unit table 13B includes a unit call table 31, an SI unit conversion table 41, a prefix table 51, an assembly unit conversion table 61, and an appropriate unit table 71. Detailed description of each table will be described later (see FIGS. 3 to 7).

  The input unit 14 includes the input key group 2 described above, and outputs an operation signal corresponding to the pressed key to the CPU 11. Specifically, the input unit 14 includes a function key 14A, numeric / character keys 14B, an enter key 14C, a cursor key 14D, an AC key 14E, and a touch panel 14F.

  The function key 14 </ b> A is a key that receives an input operation of an instruction to use various functions of the scientific calculator 1. The number / character key 14B is a key for receiving an operation of inputting numbers or characters. The determination key 14 </ b> C is a key that receives a process execution instruction or a determination instruction input operation. The cursor key 14D is a key that receives an input operation of an instruction to move the cursor indicating the editing target position or the selection target position in the display 3 in a predetermined movement direction. The AC key 14E is a key that receives an input operation of an instruction to clear the storage area of the storage unit 13.

  The touch panel 14F detects a contact position of an input pen (not shown) or the like that contacts the display screen (display screen of the display 3), and outputs the information to the CPU 11. Specifically, the touch panel 14F is provided on the display screen of the display unit 15 or on the inner side of the display screen, for example, and the position of the contact position on the display screen is determined by a method such as an electromagnetic induction method, a magnetostriction method, or a pressure sensitive method. XY coordinates are detected and the information is output to the CPU 11.

  The display unit 15 includes the display 3 described above, and performs screen display according to a display signal from the CPU 11. The display unit 15 is configured integrally with the touch panel 14F.

  Next, each table stored in the storage unit 13 will be described with reference to FIGS. First, the unit call table 31 will be described with reference to FIG. As shown in FIG. 3, the unit call table 31 has “dimension” indicating what physical quantity it is, “unit” indicating physical unit, and “reading / meaning” indicating reading and meaning. These are stored in association with each other. For example, a dimension “length”, a unit “m”, and a reading / meaning “meter” are stored in association with each other. Hereinafter, the term “unit” also refers to “physical unit”.

  Next, the SI unit conversion table 41 will be described with reference to FIG. As shown in FIG. 4, the SI unit conversion table 41 is obtained by multiplying the “dimension”, “unit” indicating a unit other than the SI unit system, and a basic unit of the SI unit system by a predetermined numerical value. Conversion "and each of them is stored in association with each other. For example, the dimension “length”, the unit “y”, and the SI unit conversion “0.9144m” are stored in association with each other. The SI unit system is also called an international unit system, and is a unit system that can be used legally in most countries and is required to be used in many countries. Therefore, it is meaningful to convert units other than the SI unit system into units of the SI unit system (hereinafter also simply referred to as “SI units”).

Next, the prefix table 51 will be described with reference to FIG. As shown in FIG. 5, the prefix table 51 includes a “prefix” indicating a prefix of a physical unit and “10 ⁿ ” that is a value that the prefix means. It is remembered. For example, the prefix “n” and 10 ⁿ “10 ⁻⁹ ” are stored in association with each other.

  Next, the assembly unit conversion table 61 will be described with reference to FIG. As shown in FIG. 6, the assembly unit conversion table 61 includes an “assembly unit” in which basic units of a plurality of SI unit systems are assembled, and a “unique name” that is a unit including a unique name representing the assembly unit. Each of which is stored in association with each other. For example, the assembly unit “kg · m / s ^ 2” and the unique name “N” are stored in association with each other.

  Next, the appropriate unit table 71 will be described with reference to FIG. As shown in FIG. 7, the appropriate unit table 71 stores appropriate units. As appropriate units, physically meaningful physical units obtained as solutions in normal calculations including physical units are stored in advance. In particular, it may be limited to a simple physical unit obtained as a solution for calculation performed by a learning beginner.

  Next, with reference to FIG. 8 to FIG. 16, a unit determination process executed by the scientific calculator 1 will be described. The unit determination process is a process of calculating a calculation formula input by the user, determining whether the calculated solution unit is an appropriate physical unit, and displaying the determination result on the display unit 15. Hereinafter, a case where a mathematical formula is input as a calculation formula will be described. In addition, it is assumed that a selection screen in which a plurality of modes (unit determination mode, which will be described later, a mode for executing normal calculation, etc.) to be executed on the scientific calculator 1 can be selected in advance is displayed on the display unit 15.

  First, a mode selection input from the user is accepted (step S1). After execution of step S1, it is determined whether or not the mode input in step S1 is the unit verify mode (unit determination mode) (step S2). The unit verify mode is a mode for determining whether or not the unit of the solution of the calculation formula is a unit stored in the appropriate unit table 71.

  If it is determined in step S2 that the unit verify mode has not been selected (step S2; NO), normal calculation in another mode in the scientific calculator 1 is executed, and thus description thereof is omitted.

  If it is determined in step S2 that the unit verify mode has been selected (step S2; YES), calculation formula input processing is executed (step S3). For example, when it is determined that the unit verify mode is selected, the characters “Unit Verify: ON” are displayed on the display unit 15 as shown in FIG.

  Here, the calculation formula input process executed in step S3 will be described with reference to FIG. First, numerical values / operators are displayed according to the input (step S11). For example, when the numerical value “14200” is input via the input unit 14, the numerical value “14200” is displayed on the display unit 15 as illustrated in FIG.

  After execution of step S11, it is determined whether or not a unit call operation has been performed by the user via the input unit 14 (step S12). The unit call operation refers to an operation for reading an input numerical unit from the unit call table 31 stored in the storage unit 13 and displaying the read unit on the display unit 15.

  If it is determined in step S12 that the unit call operation has not been performed (step S12; NO), the process proceeds to step S20 described later. If it is determined in step S12 that the unit call operation has been performed (step S12; YES), it is determined whether or not the current cursor position is a position where unit input is possible (step S13). The position where unit input is possible refers to the position immediately after the numerical value or the character representing the scalar quantity. For example, as shown in FIG. 11B, when the current cursor position (underbar position) is located immediately after the numerical value “14200”, it is determined that the cursor is a position where unit input is possible.

  If it is determined in step S13 that the unit input is not possible (step S13; NO), Error display (error display) is performed (step 14). For example, when the cursor position is immediately after the operator, unit input is not possible, and therefore an error indicating that the cursor position is a position where unit input is not possible is displayed on the display unit 15.

  If it is determined in step S13 that the unit can be input (step S13; YES), the dimensions are read from the unit call table 31, and the read dimensions are displayed as a list on the display unit 14 ( Step S15).

  When the dimension is displayed as a list in step S15, a user's desired dimension selection input is accepted by an input operation via the input unit 14 by the user (step S16).

  When a dimension selection input is received in step S16, the prefix and the unit of the selected dimension are displayed in a list (step S17). Specifically, the prefix is read from the prefix table 51, and the unit corresponding to the dimension selected in step S16 is read from the unit call table 31. Then, the read prefix and the read unit are displayed in a list on the display unit 15. At this time, for example, as shown in FIG. 11C, dimensions, prefixes, and units are displayed in a list on the display unit 15.

  After execution of step S17, a prefix and unit selection reception is executed (step S18). Specifically, the user's input operation via the input unit 14 accepts a user-desired prefix and unit selection input from among the prefixes and units displayed in a list in step 17. For example, as shown in FIG. 11C, when the dimension: length, prefix: none, and unit: m “meter” are selected and input by the user, selection reception is executed, and the selected and input location is reversed. Is displayed.

  After execution of step S18, the selected prefix and unit are displayed (step S19). For example, when dimension: length, prefix: none, unit: m “meter” is selected and input by the user, unit: m is displayed as shown in FIG.

  After execution of step S19, it is determined whether or not there has been a calculation execution operation (step S20). Specifically, it is determined whether or not an input operation (calculation execution operation) for performing an operation on the input calculation formula is accepted by an input operation via the input unit 14 by the user.

If it is determined in step S20 that there is no operation execution operation (step S20; NO), the process returns to step S11. In step S20, when it is determined that there has been a calculation execution operation (step S20; YES), the calculation formula input process is terminated and the process returns to the unit determination process.
For example, when the operator “÷” is input from the state of FIG. 11D, it is determined that there is no operation execution operation (step S20; NO), and the operator “÷” is displayed according to the input ( Step S11). Thereafter, the above processing is repeated, and when it is determined that there has been an operation execution operation in a state where the calculation formula shown in FIG. 12E is input (step S20; YES), the calculation formula input processing is terminated.

  Returning to the unit determination process shown in FIG. 8, the solution output process is executed (step S4). Here, with reference to FIG. 10, the solution output process executed in step S4 of the mathematical expression calculation process will be described.

  First, it is determined whether or not there is a unit other than the SI unit system in the calculation formula input in the calculation formula input process (step S31). Specifically, the unit of the input calculation formula and the SI unit conversion table 41 are referred to, and whether or not the unit stored in the SI unit conversion table 41 exists in the unit of the input calculation formula. Determined. For example, when the calculation formula shown in FIG. 12E is input, the calculation formula includes “h” that is a unit stored in the SI unit conversion table 41. In this case, YES is determined in this step.

  If it is determined in step S31 that there is no unit other than the SI unit system in the calculation formula (step S31; NO), the process proceeds to step S33 described later. If it is determined in step S31 that there is a unit other than the SI unit system in the calculation formula (step S31; YES), a conversion formula in which the corresponding part is converted into the SI unit system is created (step S32). That is, the unit (corresponding part) stored in the SI unit conversion table 41 is converted to the SI unit system unit (SI unit) associated in the table, and a conversion formula including the converted SI unit is created. Is done.

  For example, in the case of the equation shown in FIG. 12E, the unit “h” is a unit stored in the SI unit conversion table 41, and therefore “h” is a corresponding portion. In this case, “3600 s” stored in association with the unit “h” in the SI unit conversion table 41 is read out, and the read out “3600 s” and the numerical value of the unit “h” “2”. And multiplication is performed. That is, as shown in FIG. 11B (f), a conversion formula 14200 [m] ÷ 4 [s] ÷ 7200 [s] obtained by converting the calculation formula 14200 [m] ÷ 4 [s] ÷ 2 [h] is created. The At this time, the conversion formula may not be displayed on the display unit 15.

After execution of step S32, calculation is performed for each formula (step S33). For example, in the case of FIG. 12F, the calculation formulas 14200 [m] ÷ 4 [s] ÷ 2 [h] and the conversion formulas 14200 [m] ÷ 4 [s] ÷ 7200 [s] are respectively calculated. Executed. Thereby, the solution of the calculation formula and the solution of the conversion formula are obtained by calculation.
The calculation performed at this time is performed separately for numerical values (may be characters) and units. That is, taking FIG. 12 (f) as an example, of the calculation formula 14200 [m] ÷ 4 [s] ÷ 2 [h], the numerical portion calculation 14200 ÷ 4 ÷ 2 is executed, and the numerical portion 1775 of the solution. Is calculated. Further, the unit part calculation m ÷ s ÷ h is executed, and the unit part [m · (s · h)] of the solution is calculated. Then, 1775 [m / (h · s)] combining these is obtained as a solution.

  After execution of step S33, it is determined whether there is an assembly unit having a unique name (step S34). Specifically, the solution unit obtained in step S33 and the assembly unit conversion table 61 are compared, and the assembly unit of the assembly conversion table 61 is included in at least one of the solution of the calculation formula and the solution of the conversion formula. Whether or not this step is determined is determined depending on whether or not.

For example, it is assumed that the calculation formula shown in FIG. In this case, as shown in FIG. 16B, a conversion formula 1000 [kg] × (10 × 0.9144) [m / s ^ obtained by converting the calculation formula 1 [t] × 10 [y / s ^ 2]. 2] is created. Then, calculation of each formula is executed.
At this time, the unit [kg · m / s ^ 2] included in the solution 9144 [kg · m / s ^ 2] matches the assembly unit [kg · m / s ^ 2] of the assembly unit conversion table 61. The solution of the conversion formula includes the assembly unit of the assembly unit conversion table 61. In this case, YES is determined in this step.

  If it is determined in step S34 that there is no assembly unit having a unique name (step S34; NO), the process proceeds to step S36 described later. If it is determined in step S34 that there is an assembly unit having a unique name (step S34; YES), unit conversion is executed (step S35). That is, the assembly unit is converted into a unique name. For example, as shown in FIG. 16B, the solution 9144 [kg · m / s ^ 2] of the conversion formula includes an assembly unit [kg · m / s ^ 2]. In this case, the unique name “N” stored in association with the assembly unit [kg · m / s ^ 2] in the assembly unit conversion table 61 is read, and the assembly unit [kg · m / s ^ 2] is The unit is converted to the unique name “N”. FIG. 16B shows the case where the conversion unit includes an assembly unit. However, when the calculation solution includes an assembly unit, the assembly unit included in the calculation solution is converted into a unique name. Is done.

  After the execution of step S35, it is determined whether or not the solution unit matches the unit of the appropriate unit table (step S36). Specifically, the solution unit of the calculation formula and the solution unit of the conversion formula are compared with the proper unit stored in the proper unit table 71, and the solution unit of the calculation formula or the solution unit of the conversion formula is determined. It is determined whether any one of the proper units stored in the proper unit table 71 matches. In this step, if it is determined that the solution unit matches the unit stored in the appropriate unit table 71, the solution unit is determined to be an appropriate physical unit. If it is determined that the solution unit and the unit stored in the appropriate unit table 71 do not match, it is determined that the solution unit is not an appropriate physical unit.

  If it is determined in step S36 that the solution unit matches the unit in the appropriate unit table (step S36; YES), the result is output (step S37). At this time, if a conversion formula has been created, the solution of the conversion formula and the solution of the calculation formula are displayed on the display unit 15 in an identifiable manner. That is, the display unit 15 displays the solution of the conversion formula and the solution obtained by calculation without converting units other than the SI unit system to SI units. For example, as shown in FIG. 12 (g), the solution 0.5 [m / s ^ 2] of the conversion formula and the solution 1775 [m / (h · s)] of the calculation formula are displayed on the display unit 15. The solution of the calculation formula is displayed in parentheses. Further, as shown in FIG. 16C, the conversion formula solution 9144 [N] and the calculation formula solution 10 [t · m / s ^ 2] are displayed on the display unit 15, and the calculation formula solution is Displayed with parentheses. After executing step S37, the process returns to the unit determination process.

  If it is determined in step S36 that the unit of the solution does not match the unit of the appropriate unit table (step S36; NO), whether or not there is a unit composed of the same unit elements as the unit of the solution in the appropriate unit table. Is discriminated (step S38). That is, it is determined whether the unit element of the solution unit of the calculation formula has the same configuration as the unit element of the appropriate unit stored in the appropriate unit table 71. For example, the screen displays as shown in FIGS. 13A to 13D and FIGS. 13E to 13F are executed in order, and then 3 [kg] /9.8 [9.8] shown in FIG. Assume that calculation of m / s ^ 2] is executed. In this case, the unit [kg · m / s ^ 2] composed of the same unit elements as the unit [kg · s ^ 2 / m] of the calculation result is included in the appropriate unit table 71. In this case, YES is determined in this step.

In step S38, when it is determined that a unit composed of the same unit element as the solution unit is in the appropriate unit table (step S38; YES), the calculation formula is calculated so that an appropriate physical unit is calculated together with the error display. Are displayed as candidates (step S39). That is, along with an error display (error display) indicating that the calculation formula is incorrect, a calculation formula candidate in which the solution unit of the calculation formula is an appropriate physical unit is displayed. For example, as shown in FIG. 14 (h), an error display (error display) “Invalid Unit Calculation ERROR!” Is displayed, and calculation is performed so that an appropriate physical unit is calculated as a solution unit of the calculation formula. 3 [kg] × 9.8 [m / s ^ 2] in which the operator of the expression is changed is displayed as a candidate with “?” Added.
In addition, when the conversion formula is created, there may be a case where it is determined that the unit composed of the same unit element as the solution unit of the conversion formula is in the appropriate unit table 71. Here, it is important for the user to learn the unit calculation to know where the input calculation formula is wrong. For this reason, when it is determined that the unit composed of the same unit element as the solution unit of the conversion formula is in the appropriate unit table 71, a calculation formula candidate that is an appropriate physical unit is displayed as the solution of the calculation formula. Is done. In other words, the same operator change as when the operator of the conversion formula is changed so that the unit of the solution of the conversion formula is the unit in the appropriate unit table is reflected in the calculation formula, It is displayed as a candidate for a calculation formula that becomes a physical unit. After execution of step S39, the process returns to the unit determination process.

  If it is determined in step S38 that a unit composed of the same unit elements as the unit of the calculation result is not in the appropriate unit table (step S38; NO), an error display is displayed (step S40). For example, when the calculation of the calculation formula shown in FIG. 13A is executed, the unit composed of the same unit elements as the unit [kg · s ^ 3 / m] of the calculation result is stored in the appropriate unit table 71. not exist. Therefore, as shown in FIG. 15B, an error message “Invalid Unit Calculation ERROR!” Is displayed. After executing step S40, the process returns to the unit determination process.

  Returning to the unit determination process shown in FIG. 8, the unit determination process ends.

  As described above, according to the present embodiment, it is determined whether the solution unit of the calculation formula does not match any of the proper units stored in the proper unit table 71. Therefore, the solution unit of the calculation formula is appropriate. It is possible to evaluate whether or not it is a physical unit. In addition, even when an incorrect calculation formula is input, the display unit indicates that the calculation formula is incorrect (for example, an error display as shown in FIG. 14 (h) or FIG. 15 (b)). 15, the user can notice an error in the calculation formula. Thereby, the user can obtain an opportunity to acquire correct knowledge of the unit system, and the learning effect of the user can be enhanced.

  Further, since the solution of the conversion equation is calculated and the calculated solution of the conversion equation is displayed on the display unit 15, the user can refer to the solution expressed in SI units which are normal units.

  Further, since the solution of the calculation formula and the solution of the conversion formula are displayed on the display unit 15, the user can compare the solution of the calculation formula with the solution of the conversion formula. In addition, the user can enhance the learning effect on the conversion to the SI unit by comparing the solution of the calculation formula and the solution of the conversion formula.

  Further, when an assembly unit is included in at least one of the solution of the calculation formula and the solution of the conversion formula, the assembly unit is converted into a unique name and displayed on the display unit 15, so that the user is regular and concise. It is possible to refer to the solution.

  Also, if the appropriate unit and the solution unit of the formula do not match and the unit element of the solution unit of the formula is the same as the unit element of the appropriate unit, the unit of the solution of the formula is the appropriate physical unit The calculation formula candidates to be displayed are displayed on the display unit 15. Thereby, even if the input calculation formula is wrong, the user can know where the calculation formula is wrong and can know a candidate for the correct calculation formula.

  The user can also select and input units, dimensions, and prefixes. Thereby, the user can input a desired mathematical expression. In addition, for example, even when the unit notation is the same (for example, the unit “m” is the same as “m” but has the same meaning as meter or minute), the user has the same meaning. The desired unit dimension can be selected.

  The description in the above embodiment is an example of a computer and a program according to the present invention, and the present invention is not limited to this.

  For example, in the above-described embodiment, the mathematical formula calculation process in the case where a mathematical formula is input as a calculation formula has been described, but the present invention is not limited to this. For example, as shown in FIG. 17A, similar processing is executed even when a character expression is input. When the character formula shown in FIG. 17A is input, a conversion formula is created, and the created conversion formula and calculation formula are calculated (see FIG. 17B). Then, the calculation result 0.9144 mgh [J] of the conversion formula and the calculation result mgh [kg · m · y / s ^ 2] of the calculation formula are displayed on the display unit 15 (see FIG. 17C).

Further, when the number of characters in a unit included in the solution of the calculation formula becomes a certain number or more, it may be determined that the solution of the calculation formula is not an appropriate physical unit. Here, the number of characters of a unit means the number of characters constituting a physical unit in the solution of the calculation formula displayed on the display unit. For example, the number of characters in the unit in FIG. 16C is “1” for “N” and “t · m / s ^ 2” for “t”, “m”, and “s”. 3 ”.
The invention according to the present embodiment is intended to deepen the understanding of units, particularly for beginners of unit calculation, and therefore, a complicated calculation formula in which the number of characters of units included in the correct answer exceeds a certain number is used. It is hard to think about giving. Therefore, it is effective to use such a determination method.
In this case, for example, when “6” is defined as the reference (reference unit) of the number of characters of the unit included in the solution of the calculation formula, the number of characters of the unit included in the calculation formula solution does not exceed “6”. In this case, the unit included in the solution of the calculation formula is an appropriate physical unit. If the number of characters of the unit included in the solution of the calculation formula exceeds “6”, the unit included in the solution of the calculation formula is an appropriate physical unit. It may be determined that it is not a unit.

  In addition, it goes without saying that the detailed configuration and detailed operation of each component of the scientific calculator 1 in the above embodiment can be changed as appropriate without departing from the spirit of the present invention.

1 Scientific calculator 2 Input key group 11 CPU
12 RAM
13 Storage Unit 14 Input Unit 15 Display Unit 13A Various Processing Programs 13B Unit Table 31 Unit Call Table 41 Unit Conversion Table 51 Prefix Table 61 Assembly Unit Conversion Table 71 Appropriate Unit Table

Claims (7)

An appropriate unit storage means for storing a predetermined unit as an appropriate unit;
Formula display means for displaying a calculation formula including a numerical value or a character with a unit as a constituent element;
A calculation means for calculating a solution of the calculation formula displayed on the formula display means;
When the unit of the solution of the calculation formula obtained by the calculation means does not match any appropriate unit stored by the appropriate unit storage means, a determination result display means for displaying that fact;
An arithmetic device comprising: A conversion means for converting a unit other than the SI unit system into an SI unit when the calculation formula includes a unit other than the SI unit system;
A conversion expression creating means for creating a conversion expression including the SI unit converted by the conversion means;
A conversion formula calculation means for calculating a solution of the conversion formula created by the conversion formula creation means;
Conversion formula solution display means for displaying a solution of the conversion formula obtained by the conversion formula calculation means;
The arithmetic device according to claim 1, comprising: When the calculation formula includes a unit other than the SI unit system, a calculation formula calculation means for calculating a solution of the calculation formula without converting a unit other than the SI unit system into an SI unit;
Solution display means for displaying a solution of the calculation formula obtained by the calculation formula calculation means and a solution of the conversion formula calculated by the conversion formula calculation means;
The arithmetic device according to claim 2 provided. When at least one of the solution of the calculation formula and the solution of the conversion formula includes an assembly unit in which a basic unit of the SI unit system is assembled, the assembly unit is converted into a unit having a unique name representing the assembly unit. Unit conversion means;
Unique name display means for displaying a unit consisting of the unique name converted by the unit conversion means;
The arithmetic unit according to claim 2 or 3.   The unit of solution of the calculation formula does not match any appropriate unit stored by the appropriate unit storage means, and the unit element of the solution of the calculation formula is the same as the unit element of the unit stored in the appropriate unit storage means 5. The arithmetic device according to claim 1, further comprising: a candidate display unit configured to display a candidate for the calculation formula in which a unit of a solution of the calculation formula is an appropriate physical unit.   The input unit for selecting and inputting at least one of a unit included in the calculation formula, a dimension corresponding to the unit, and a prefix corresponding to the unit, according to claim 1. Arithmetic unit. Computer
An appropriate unit storage means for storing a predetermined unit as an appropriate unit;
Formula display means for displaying a calculation formula including a numerical value or a character with a unit as a component,
Calculation means for obtaining a solution of the calculation formula displayed on the expression display means by calculation,
When the unit of the solution of the calculation formula obtained by the calculation means does not match any appropriate unit stored by the appropriate unit storage means, a determination result display means for displaying that effect,
Program to function as.

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