unmpiswitch_corn.f90

基于linux操作下的fortran快速付立变换的程序

        subroutine unmpiswitch_corn(j3,n1dfft,Jp2stf,J2stf,lot,n1,md2,nd3,nproc,zw,zmpi1)
        implicit real*8 (a-h,o-z)
        dimension zmpi1(2,n1/2,md2/nproc,nd3/nproc,nproc),zw(2,lot,n1)
! WARNING: Assuming that high frequencies are in the corners
!          and that n1 is multiple of 4

        mfft=0
        do 300,Jp2=Jp2stf,nproc
        do 200,J2=J2stf,md2/nproc
        mfft=mfft+1
        if (mfft.gt.n1dfft) then
        Jp2stf=Jp2
        J2stf=J2
        return
        endif
        do 100,I1=n1/4+1,3*n1/4
        zmpi1(1,I1-n1/4,J2,j3,Jp2)=zw(1,mfft,I1)
        zmpi1(2,I1-n1/4,J2,j3,Jp2)=zw(2,mfft,I1)
100     continue
200     continue
        J2stf=1
300     continue
        end