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dhfwt2dsws_.F

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00001 c dhfwt2dsws_.F
00002 c*********************************************************************
00003 c*          (c) Copyright 1994-2002 Brown Deer Technology, LLC.
00004 c*                        All rights reserved.
00005 c*********************************************************************
00006 
00007         subroutine dhfwt2dsws(Sizef2d,ns,size,sdata,wdata,ws,iflag)
00008 
00009         implicit none
00010 
00011 c       ****************************************
00012 c       ***** COMMON BLOCKS AND PARAMETERS *****
00013 c       ****************************************
00014 
00015 #include "stormdef.h"
00016         double precision INVSQRT2
00017         parameter( INVSQRT2 = STORMDEF_MATHCONST_INVSQRT2d0 )
00018 
00019 c       *******************************
00020 c       ***** VARIABLES EXCHANGED *****
00021 c       *******************************
00022 
00023         integer Sizef2d 
00024         integer ns
00025         integer size
00026         double precision sdata(Sizef2d,Sizef2d)
00027         double precision wdata(Sizef2d,Sizef2d)
00028         double precision ws(2*Sizef2d)
00029         integer iflag
00030 
00031 c       ***************************
00032 c       ***** LOCAL VARIABLES *****
00033 c       ***************************
00034 
00035         integer i,j,ii,jj
00036         integer size1,size2
00037 
00038 c       ******************************
00039 c       ***** EXTERNAL FUNCTIONS *****
00040 c       ******************************
00041 
00042 #ifdef STORM_FWT_FCHECKUSAGE
00043         if (size.lt.ns) then
00044            iflag=1
00045            return
00046         endif
00047 #endif
00048 
00049         do i=1,size
00050            do j=1,size
00051               wdata(i,j)=sdata(i,j)
00052            enddo
00053         enddo
00054 
00055         if (size.eq.ns) then
00056            iflag=0
00057            return
00058         endif
00059 
00060         size1=size
00061 
00062 10      continue
00063 
00064         size2=size1/2
00065 
00066 c ##### index 1 #####
00067         do j=1,size1
00068 
00069               do i=1,size1
00070                  ws(i)=wdata(i,j)
00071               enddo
00072 
00073               do i = 1,size2
00074                  ii = 2*i - 1
00075                  ws(Sizef2d+i) = ( ws(ii) + ws(ii+1) ) * INVSQRT2
00076                  ws(Sizef2d+size2+i) = ( ws(ii) - ws(ii+1) ) * INVSQRT2
00077               enddo
00078 
00079               do i=1,size1
00080                  wdata(i,j)=ws(Sizef2d+i)
00081               enddo
00082 
00083         enddo
00084 
00085 c ##### index 2 #####
00086         do i=1,size1
00087 
00088               do j=1,size1
00089                  ws(j)=wdata(i,j)
00090               enddo
00091 
00092               do j = 1, size2
00093                  jj = 2*j - 1
00094                  ws(Sizef2d+j) = ( ws(jj) + ws(jj+1) ) * INVSQRT2
00095                  ws(Sizef2d+size2+j) = ( ws(jj) - ws(jj+1) ) * INVSQRT2
00096               enddo
00097 
00098               do j=1,size1
00099                 wdata(i,j)=ws(Sizef2d+j)
00100               enddo
00101 
00102         enddo
00103 
00104         size1=size2
00105 
00106         if (size1.gt.ns) then
00107            goto 10
00108         endif
00109 
00110 #ifdef STORM_FWT_FCHECKUSAGE
00111         if (size1.ne.ns) then
00112            iflag=2
00113            return
00114         endif
00115 #endif
00116 
00117         iflag=0
00118 
00119         return
00120         end
00121 

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