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dg1ifwt_.F

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00001 c dg1ifwt_.F
00002 c*********************************************************************
00003 c*          (c) Copyright 1994-2002 Brown Deer Technology, LLC.
00004 c*                        All rights reserved.
00005 c*********************************************************************
00006 
00007         subroutine dg1ifwt(Sizef,ns,size,wdata,sdata,iflag)
00008 
00009         implicit none
00010 
00011 c       ****************************************
00012 c       ***** COMMON BLOCKS AND PARAMETERS *****
00013 c       ****************************************
00014 
00015 #include "stormdef.h"
00016         double precision H00,H10,H11
00017         parameter( H00 = STORMDEF_MATHCONST_GHB1H00d0 )
00018         parameter( H10 = STORMDEF_MATHCONST_GHB1H10d0 )
00019         parameter( H11 = STORMDEF_MATHCONST_GHB1H11d0 )
00020 
00021 c       *******************************
00022 c       ***** VARIABLES EXCHANGED *****
00023 c       *******************************
00024 
00025         integer Sizef
00026         integer ns
00027         integer size
00028         double precision wdata(0:1,Sizef)
00029         double precision sdata(0:1,Sizef)
00030         integer iflag
00031 
00032 c       ***************************
00033 c       ***** LOCAL VARIABLES *****
00034 c       ***************************
00035 
00036         integer i,size1,size2
00037         double precision xx(0:1,Sizef)
00038 
00039 c       ******************************
00040 c       ***** EXTERNAL FUNCTIONS *****
00041 c       ******************************
00042 
00043 #ifdef STORM_FWT_FCHECKUSAGE
00044         if (size.lt.ns) then 
00045            iflag=1
00046            return
00047         endif
00048 #endif
00049 
00050         if (size.eq.ns) then
00051            do i=1,size
00052               sdata(0,i)=wdata(0,i)
00053               sdata(1,i)=wdata(1,i)
00054            enddo
00055            iflag=0
00056            return
00057         endif
00058 
00059         do i=1,size
00060            xx(0,i)=wdata(0,i)
00061            xx(1,i)=wdata(1,i)
00062         enddo
00063 
00064         size1=ns
00065 
00066 10      continue
00067         size2=size1
00068         size1=2*size1
00069         do i = 1,size2
00070            sdata(0,2*i-1)=H00*xx(0,i)+H11*xx(0,size2+i)+H10*xx(1,i)
00071            sdata(1,2*i-1)=-H10*xx(0,size2+i)+H11*xx(1,i)+H00*xx(1,size2+i)
00072            sdata(0,2*i)=H00*xx(0,i)-H11*xx(0,size2+i)-H10*xx(1,i)
00073            sdata(1,2*i)= -H10*xx(0,size2+i)+H11*xx(1,i)-H00*xx(1,size2+i)
00074         enddo
00075 
00076         if (size1.lt.size) then
00077            do i=1,size1
00078                xx(0,i)=sdata(0,i)
00079                xx(1,i)=sdata(1,i)
00080            enddo
00081            goto 10
00082         endif
00083 
00084 #ifdef STORM_FWT_FCHECKUSAGE
00085         if (size1.ne.size) then
00086            iflag=2
00087            return
00088         endif
00089 #endif
00090 
00091         iflag=0
00092 
00093         return
00094         end
00095 

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