subroutine zmf4kf ( lot, ido, l1, na, cc, im1, in1, ch, im2, in2, wa ) !*****************************************************************************80 ! !! ZMF4KF is an FFTPACK5 auxiliary routine. ! ! ! ! Modified: ! ! 26 Ausust 2009 ! ! Author: ! ! Original complex single precision by Paul Swarztrauber, Richard Valent. ! Complex double precision version by John Burkardt. ! ! Reference: ! ! Paul Swarztrauber, ! Vectorizing the Fast Fourier Transforms, ! in Parallel Computations, ! edited by G. Rodrigue, ! Academic Press, 1982. ! ! Paul Swarztrauber, ! Fast Fourier Transform Algorithms for Vector Computers, ! Parallel Computing, pages 45-63, 1984. ! ! Parameters: ! implicit none integer ( kind = 4 ) ido integer ( kind = 4 ) in1 integer ( kind = 4 ) in2 integer ( kind = 4 ) l1 real ( kind = 8 ) cc(2,in1,l1,ido,4) real ( kind = 8 ) ch(2,in2,l1,4,ido) real ( kind = 8 ) ci2 real ( kind = 8 ) ci3 real ( kind = 8 ) ci4 real ( kind = 8 ) cr2 real ( kind = 8 ) cr3 real ( kind = 8 ) cr4 integer ( kind = 4 ) i integer ( kind = 4 ) im1 integer ( kind = 4 ) im2 integer ( kind = 4 ) k integer ( kind = 4 ) lot integer ( kind = 4 ) m1 integer ( kind = 4 ) m1d integer ( kind = 4 ) m2 integer ( kind = 4 ) m2s integer ( kind = 4 ) na real ( kind = 8 ) sn real ( kind = 8 ) ti1 real ( kind = 8 ) ti2 real ( kind = 8 ) ti3 real ( kind = 8 ) ti4 real ( kind = 8 ) tr1 real ( kind = 8 ) tr2 real ( kind = 8 ) tr3 real ( kind = 8 ) tr4 real ( kind = 8 ) wa(ido,3,2) m1d = ( lot - 1 ) * im1 + 1 m2s = 1 - im2 if ( 1 < ido ) then do k = 1, l1 m2 = m2s do m1 = 1, m1d, im1 m2 = m2 + im2 ti1 = cc(2,m1,k,1,1)-cc(2,m1,k,1,3) ti2 = cc(2,m1,k,1,1)+cc(2,m1,k,1,3) tr4 = cc(2,m1,k,1,2)-cc(2,m1,k,1,4) ti3 = cc(2,m1,k,1,2)+cc(2,m1,k,1,4) tr1 = cc(1,m1,k,1,1)-cc(1,m1,k,1,3) tr2 = cc(1,m1,k,1,1)+cc(1,m1,k,1,3) ti4 = cc(1,m1,k,1,4)-cc(1,m1,k,1,2) tr3 = cc(1,m1,k,1,2)+cc(1,m1,k,1,4) ch(1,m2,k,1,1) = tr2+tr3 ch(1,m2,k,3,1) = tr2-tr3 ch(2,m2,k,1,1) = ti2+ti3 ch(2,m2,k,3,1) = ti2-ti3 ch(1,m2,k,2,1) = tr1+tr4 ch(1,m2,k,4,1) = tr1-tr4 ch(2,m2,k,2,1) = ti1+ti4 ch(2,m2,k,4,1) = ti1-ti4 end do end do do i = 2, ido do k = 1, l1 m2 = m2s do m1 = 1, m1d, im1 m2 = m2 + im2 ti1 = cc(2,m1,k,i,1)-cc(2,m1,k,i,3) ti2 = cc(2,m1,k,i,1)+cc(2,m1,k,i,3) ti3 = cc(2,m1,k,i,2)+cc(2,m1,k,i,4) tr4 = cc(2,m1,k,i,2)-cc(2,m1,k,i,4) tr1 = cc(1,m1,k,i,1)-cc(1,m1,k,i,3) tr2 = cc(1,m1,k,i,1)+cc(1,m1,k,i,3) ti4 = cc(1,m1,k,i,4)-cc(1,m1,k,i,2) tr3 = cc(1,m1,k,i,2)+cc(1,m1,k,i,4) ch(1,m2,k,1,i) = tr2+tr3 cr3 = tr2-tr3 ch(2,m2,k,1,i) = ti2+ti3 ci3 = ti2-ti3 cr2 = tr1+tr4 cr4 = tr1-tr4 ci2 = ti1+ti4 ci4 = ti1-ti4 ch(1,m2,k,2,i) = wa(i,1,1)*cr2+wa(i,1,2)*ci2 ch(2,m2,k,2,i) = wa(i,1,1)*ci2-wa(i,1,2)*cr2 ch(1,m2,k,3,i) = wa(i,2,1)*cr3+wa(i,2,2)*ci3 ch(2,m2,k,3,i) = wa(i,2,1)*ci3-wa(i,2,2)*cr3 ch(1,m2,k,4,i) = wa(i,3,1)*cr4+wa(i,3,2)*ci4 ch(2,m2,k,4,i) = wa(i,3,1)*ci4-wa(i,3,2)*cr4 end do end do end do else if ( na == 1 ) then sn = 1.0D+00 / real ( 4 * l1, kind = 8 ) do k = 1, l1 m2 = m2s do m1 = 1, m1d, im1 m2 = m2 + im2 ti1 = cc(2,m1,k,1,1)-cc(2,m1,k,1,3) ti2 = cc(2,m1,k,1,1)+cc(2,m1,k,1,3) tr4 = cc(2,m1,k,1,2)-cc(2,m1,k,1,4) ti3 = cc(2,m1,k,1,2)+cc(2,m1,k,1,4) tr1 = cc(1,m1,k,1,1)-cc(1,m1,k,1,3) tr2 = cc(1,m1,k,1,1)+cc(1,m1,k,1,3) ti4 = cc(1,m1,k,1,4)-cc(1,m1,k,1,2) tr3 = cc(1,m1,k,1,2)+cc(1,m1,k,1,4) ch(1,m2,k,1,1) = sn*(tr2+tr3) ch(1,m2,k,3,1) = sn*(tr2-tr3) ch(2,m2,k,1,1) = sn*(ti2+ti3) ch(2,m2,k,3,1) = sn*(ti2-ti3) ch(1,m2,k,2,1) = sn*(tr1+tr4) ch(1,m2,k,4,1) = sn*(tr1-tr4) ch(2,m2,k,2,1) = sn*(ti1+ti4) ch(2,m2,k,4,1) = sn*(ti1-ti4) end do end do else sn = 1.0D+00 / real ( 4 * l1, kind = 8 ) do k = 1, l1 do m1 = 1, m1d, im1 ti1 = cc(2,m1,k,1,1)-cc(2,m1,k,1,3) ti2 = cc(2,m1,k,1,1)+cc(2,m1,k,1,3) tr4 = cc(2,m1,k,1,2)-cc(2,m1,k,1,4) ti3 = cc(2,m1,k,1,2)+cc(2,m1,k,1,4) tr1 = cc(1,m1,k,1,1)-cc(1,m1,k,1,3) tr2 = cc(1,m1,k,1,1)+cc(1,m1,k,1,3) ti4 = cc(1,m1,k,1,4)-cc(1,m1,k,1,2) tr3 = cc(1,m1,k,1,2)+cc(1,m1,k,1,4) cc(1,m1,k,1,1) = sn*(tr2+tr3) cc(1,m1,k,1,3) = sn*(tr2-tr3) cc(2,m1,k,1,1) = sn*(ti2+ti3) cc(2,m1,k,1,3) = sn*(ti2-ti3) cc(1,m1,k,1,2) = sn*(tr1+tr4) cc(1,m1,k,1,4) = sn*(tr1-tr4) cc(2,m1,k,1,2) = sn*(ti1+ti4) cc(2,m1,k,1,4) = sn*(ti1-ti4) end do end do end if return end