Latex Equation Compiler eqc

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EQC NEWS -- history of user-visible changes.  12 May 2018

Copyright (C) 2001-2018 Jan Rheinlaender
See the end for copying conditions.

Please send EQC bug reports to jrheinlaender@users.sourceforge.net
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Version 1.4.20
  * Avoid unnecessary conversion of numerics to floats when searching for values of expressions
  * Avoid crashes when printing non-commutative symbols, functions, vectors and matrices
  * Fix bug in ceil() and floor() functions that did not allow a parameter of 0 digits
  * Add support for GiNaC 1.7
  * Ensure that QUANTITY always reduces numbers to floating point values (which VAL does not necessarily do)
  * Add missing keywords \diff and \pdiff which immediately (partially) differentiate an expression to the given variable
  * Miscellaneous bug fixes
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Version 1.4.18
  * Enhance SOLVE keyword to handle matrices and linear systems
  * Enhance ifelse() function to interpret integer values (false=0, true=!false, -1=not able to evaluate)
  * Improve mindex() function for vectors
  * Add conjugate() function
  * Allow defining real and positive variables (that is, not complex, greater than zero). Currently for iMath only
  * Fix bug in printing degenerated complex numbers (where the imaginary part is zero)
  * Fix bug in the algorithm for solving quartic equations, for the case where the depressed form is biquadratic
  * Add option showlabels (currently only used by iMath)
  * Print conjugate(p) as bar{p} in imath_print context
  * Fix bug in round() function that did not allow rounding to 0 digits
  * Added function charpoly to calculate characteristic polynomial of a matrix
  * Improve CONSTDEF so that constant values do not get automatically evaluated to floats
  * Fix option suppress_units in iMath by replacing all units with 1 in the GiNaC expression before printing
  * Fix bug that did not clear the expression splitting cache in eqc::clear
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Version 1.4.16
  * Return real positive nth roots as the result of VAL() instead of the root on the principal branch (which is complex for negative bases)
  * Added option to control evaluation of nth roots to either real values or the principal branch value
  * Fixed bug when printing expressions with complex floating-point numbers
  * Fixed bug when printing powers of negative numbers
  * Added function det() to calculate determinants of matrices
  * Added internal function setsymprops() to allow changing symbols to vectors or matrices
  * Added internal method get_string() to access the content of a stringex object
  * Improved handling of matrices
  * Skip library equations when searching for values
  * Fix several bugs in det(), vmin() and vmax() functions
  * Improve handling of powers of differentials. Two rules for working with differentials
    - Always use DIFFERENTIATE instead of DIFFERENTIAL whenever possible, e.g. DIFFERENTIATE(f(x), x, 1) instead of DIFFERENTIAL(f(x))/DIFFERENTIAL(x)
    - When using DIFFERENTIAL, make sure that the grade in numerator and denominator match, e.g. DIFFERENTIAL(f(x), 2) = x^2 DIFFERENTIAL(x,2)
  * Add specialised printing method for factorials
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Version 1.4.14
  * Improve evaluation of integrals by expanding expressions first to get a
  * sum of simpler expressions
  * Added method to find precedence of an expression
  * Enabled eqc::clearall() to persist symbols across compilation runs
  * Removed version.h which was superfluous
  * Added method to dump all variables with their values and assignments
  * Enhanced ifelse() function to handle quantities (numerics plus units)
  * Added option suppress_units to suppress printing of units
  * Some enhancements to sum function: Implement differentiation. Remove
  * brackets if the argument of the function is a mul
  * Enhance unsafe simplifications to combine powers with same basis and
  * different exponents
  * Improve printing of functions with multiple arguments. Add spaces to fix
  * formatting error when subscripts are in used in the argument list.
  * Change the argument delimiter if the de
  * Improve printing of polynomials with complex coefficients
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Version 1.4.13
  * Print abs() without brackets around the argument (only vertical bars)
  * Handle imathprint print contecxt in func::print()
  * Completely reworked and enhanced symbolic integration for func objects
  * Fix bug in all hard-coded functions in func.cpp that introduced the LaTeX 
    names for iMath funcs
  * Removed pointless *_deriv() functions in func.cpp
  * Reworked integral support with a new class extintegral
  * Replaced \diff() function with new class differential
  * Enabled functions as integration variable for integrals
  * Moved hash functions into utils.cpp
  * Enabled hash calculation for ncsymbol objects
  * Fixed some bugs in printing.cpp
  * Print differentials nicely by matching numerators and denominators
  * Fix bugs in printing of integrals and differentials
  * Fix bugs in formatting of diff types line and dot
  * Fix bugs concerning partial differentiation
  * Added PKGBUILD file for archlinux, thanks to Cristóbal Tapia
  * Fixed bug in multiple differentiation
  * Fixed bug in func::print_diff_line()
  * Fixed printing format errors for exp() and ln()
  * Fixed printing format error for trigonometric functions unknown to Office
  * Fixed bug in printing of sums with differentials
  * Fixed bug that broke collect-common for terms that contain a differential
  * Fixed bug in evaluation of partial differentials
  * Print sums under an integral with brackets
  * Enhance the differential() function to take a second argument, the grade of the differential
  * Implemented ITERVAL keyword
  * Added functionality to return domain and range of functions
  * Avoid formatting an expression as a polynomial if the variable of the polynomial is not obvious
  * Add missing functionality to multiply two equations (multiplying LHS and RHS of each)
  * Fixed bug in printing of polynomials where last coefficient is negative
  * Added keyword EQCOLLECT
  * Fixed printing of imaginary numbers with too many brackets
  * Fixed printing format error for negative fractions
  * Added functions for direct partial differentiation of expressions and equations
  * Reject function definitions with non-symbolic arguments
  * Added option 'underflow' to control whether CLN should throw a floating point underflow exception
  * Fixed some bugs when dealing with inequalities
  * Avoid conversion from cl_N to double if possible
  * Reduce space between partial sign and symbol
  * Ignore errors like division by zero when searching for values with VAL()  
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Version 1.4.12
  * Fixed bug that caused problems with variables shadowed by functions with
    the same name
  * Added explanation and functions for temperature unit conversions
  * Fixed bug that crashed iMath when RHS is a func
  * Fixed bug that crashed EQC when called without arguments
  * Handle fderivative objects that might be introduced by diff()
  * Properly print exp(x) as e^x
  * Print abs() without brackets around the argument (only vertical bars)
  * Handle imathprint print contecxt in func::print()
  * Completely reworked and enhanced symbolic integration for func objects
  * Fix bug in all hard-coded functions in func.cpp that introduced the
    LaTeX names for iMath funcs
  * Removed pointless *_deriv() functions in func.cpp
  * Reworked integral support with a new class extintegral
  * Replaced \diff() function with new class differential
  * Enabled functions as integration variable for integrals
  * Moved hash functions into utils.cpp
  * Enabled hash calculation for ncsymbol objects
  * Fixed some bugs in printing.cpp
  * Print differentials nicely by matching numerators and denominators
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Version 1.4.11
  * Fixed bug in eqc-tour.tex
  * Fixed some stuff found by cppcheck
  * Replaced deprecated YYPARSE_PARAM with %parse-param
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Version 1.4.10
  * Fixed bug that mixed ln and log when used with iMath
  * Allow argument lists in \usepackage options
  * Fixed bug that did not print the '%' sign as a unit in iMath
  * Integrated imathprint code and fixed some bugs in it as well
  * Fixed bug that always printed the imaginary unit in brackets
  * Fixed bug when printing adds with all negative components in iMath
  * Fixed bug that sometimes printed real numbers in brackets
  * Removed all throw() specifications from function definitions
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Version 1.4.9
  * Fixed bug that ignored user formatting (option eqraw) for \constant
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Version 1.4.8
  * Fixed bug for operator* which refused to multiply expression with zero
  * Fixed bug for \integral which tried to raw-print it
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Version 1.4.7
  * Fixed bug where the RHS of "x = [m]^3" was not recognized as a quantity
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Version 1.4.6
  * Added string data type
  * Added "exponent" option to set a fixed exponent for printing floats
  * Added vmin and vmax functions
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Version 1.4.5
  * Reworked eqraw formatting completely
  * Parse unicode superscripts, subscripts and fraction characters
  * Minor changes for iMath 2.0.0

Version 1.4.4
  * Rebuilt for libginac2
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Version 1.4.3
  * Better matrix support
  * Output file cleaning with option cleancomments
  * Controlling debug output with option debug
  * Switching between \tg and \tan with option tan_is_tg
  * Unicode support
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Version 1.4.2
  * Minor changes
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Version 1.4.1
  * Minor changes
  * Changed class Unit to use a factory for creating Unit objects
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Version 1.4.0
  * Split code into libeqc and the eqc program
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Version 1.3.1
  * Removed most globals to make linking as a shared library easier
  * Added support for symbolic integrals
  * Upgraded to use libginac1.5
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Version 1.3.0
  * Added support for matrices
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Version 1.2.1
  * Upgrade to use libginac1.4 and libcln5         
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Version 1.2.0
  *  Minor bug fixes.
  * Any equations that do not have a user-defined label are not
    considered any more for finding values, except if they are a direct
    assignment to a symbol.
  * Added keywords \valwith, quantitywith, numvalwith and unitswith.
  * Some beautification for the LaTeX printing routine output.
  * Added simplification type gather-sqrt to combine single
    square roots into one root symbol.
  * Added option eqsplit and eqsplittext to split a
    long equation at a given operator.
  * Added option vecautosize to automatically size a vector
    (if the step count is given as 0).
  * Switched to using pkg-config instead of AM_PATH_GINAC, as
    required by ginac >= 1.3.7
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Version 1.1.0
  * Minor bug squashes
  * Added keywords ceil and \floor.
  * In equations, i is now recognized as the imaginary unit (square root of -1).
  * Sorted out some autoconf/automake problems and updated the documentation. 
    Cross-compiling to Windows now works with the configure/make commands (see that
    section for details).
  * \eqsolve now handles problems with denominators not equal to one.
  *  Added command-line parsing of options for unix version (see eqc --help)
  * Combined all option keywords into the common syntax \eqcoptions {'key' = 'val'}
  * Automatic aligning of equations (formerly eqautoalign) is now always on. It can be
    overriden by specifying a certain alignment type, e.g. \eq[eqalign=none]{...}.
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Version 1.0.0
  * First production release

  * Vectors can now be created with the syntax begin:end:step.
  * Port to gcc3.3.
  * Added wildcard function wild().
  * Made differentiation of functions work and print better.
  * Added keyword \diff to create derivatives. They can be evaluated (that
    is, the derivative can be explicitly calculated) by \eqsimpf{...}{diff}.
  * Added factorial function '!'.
  * Added the sum function \sum. It can be explicitly calculated by
    \eqsimpf{...}{diff}
  * Added keyword \eqevalp to evaluate functions given in parameter form.
  * Added keyword \eqwrite to save equations to a file and reuse them in another
    document.
  * Added taylor series creation of an expression with \tseries.
  * Optimized the value finding code for faster execution. 
  * Added the AM_PATH_GINAC macro to configure.in.in. This needs a patch
      to ginac.m4 on my system (see section Compilation and Installation)
  * Cross-compiled EQC to windows (see section Compilation and Installation)
  * Added Digits = 12 globally to aleviate problems of expressions
    evaluating to things like x^(0.99999999999999995)
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Version 0.9.0
  *  Updated and enhanced release
  
  *  Removed bug which did not print muls inside muls and adds inside
     adds.
  *  Removed automatic expansion and normalization after divisions,
      this must be done manually now using \eqsimpf.
  *  Changed \preferred_units to \preferredunits for LaTeX conformity. 
  *  Introduced dummy macros in eqc.sty to enable the raw tex file to
     be passed through LaTeX without generating too many errors. This
     allows the use of preview-latex in emacs, for example.
  *  Added keyword \eqfunc to apply a function to both sides of the
     equation.
  *  Added simplification type unsafe.  
  *  Added keyword \printoptions, this now replaces \autoalign.
     \raw and \eqc are now printing options eqraw and eqnoraw.
  *  Trigonometric functions now evaluate automatically if possible
      (for example, \cos(\pi) becomes 0).
  *  Made equation a subclass of GiNaC::relational and expression of
     GiNaC::ex, which allows a great deal of simplifications in the
     grammar.  
  *  Removed bug which prevented \val[\degree]{...} from working
     correctly.  
  *  Removed bug which prevented substitutions of user-defined
     functions from working correctly.  
  *  Changed the func::eval() routine so that it takes advantage of the
     simplification rules defined for GiNaC's hard-coded functions,
     e.g. \tan\arctan{x} = x.
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Version 0.8.0

* Updated and enhanced release
        
* Added keywords \aligneq, \autoalign, \noautoalign and \dumpeq
* The amsmath keywords \tfrac and \dfrac are now recognized (but
  not printed in eqc output)
* Implemented keyword nesting (e.g., \eqsubst{z = x^2}{\eqadd{x-y = 4}{y}}, 
  which would result in z = (4+y)^2)
* Merged the equation and the file parser to simplify the code.
* Implemented operators +, -, *, / and ^ for equations (e.g. \eqrev{"prev" + 3y}).
* Enabled operators +, -, * and / between two equations (e.g. 
  \eqrev{"prev" + "eq:other"} ).
* Added simplification type collect_common.
* Added keywords \denom and \numer.
* Added keyword \eqsolve
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Version 0.7

* First Debian release
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