[go: up one dir, main page]
Menu ▾ ▴

[r34]: / common / dierckx / fpgivs.f  Maximize  Restore  History

Download this file

21 lines (20 with data), 497 Bytes 

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
      subroutine fpgivs(piv,ww,cos,sin)

c  subroutine fpgivs calculates the parameters of a givens

c  transformation .

c  ..

c  ..scalar arguments..

      real piv,ww,cos,sin

c  ..local scalars..

      real dd,one,store

c  ..function references..

      real abs,sqrt

c  ..

      one = 0.1e+01

      store = abs(piv)

      if(store.ge.ww) dd = store*sqrt(one+(ww/piv)**2)

      if(store.lt.ww) dd = ww*sqrt(one+(piv/ww)**2)

      cos = ww/dd

      sin = piv/dd

      ww = dd

      return

      end