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  • Committer: Bazaar Package Importer
  • Author(s): Torsten Werner
  • Date: 2002-03-21 16:57:43 UTC
  • Revision ID: james.westby@ubuntu.com-20020321165743-e9mv12c1tb1plztg
Tags: upstream-2.6
Import upstream version 2.6

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routines/signal/r4tx.f
 
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      subroutine r4tx(nthpo, cr0, cr1, cr2, cr3, ci0, ci1, ci2, ci3)
 
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c!
 
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c subroutine:  r4tx
 
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c sous-programme d'iteration en base 4
 
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c!
 
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      double precision cr0(*), cr1(*), cr2(*), cr3(*),
 
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     & ci0(*), ci1(*), ci2(*), ci3(*)
 
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      double precision r1,r2,r3,r4,fi1,fi2,fi3,fi4
 
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c
 
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      do 10 k=1,nthpo,4
 
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      r1=cr0(k)+cr2(k)
 
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      r2=cr0(k)-cr2(k)
 
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      r3=cr1(k)+cr3(k)
 
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      r4=cr1(k)-cr3(k)
 
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      fi1=ci0(k)+ci2(k)
 
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      fi2=ci0(k)-ci2(k)
 
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      fi3=ci1(k)+ci3(k)
 
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      fi4=ci1(k)-ci3(k)
 
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      cr0(k)=r1+r3
 
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      ci0(k)=fi1+fi3
 
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      cr1(k)=r1-r3
 
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      ci1(k)=fi1-fi3
 
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      cr2(k)=r2-fi4
 
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      ci2(k)=fi2+r4
 
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      cr3(k)=r2+fi4
 
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      ci3(k)=fi2-r4
 
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  10  continue
 
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      return
 
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      end