Mercurial > octave-nkf
view libcruft/blas/zswap.f @ 8924:3c3cbe8f18e0 ss-3-1-54
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author | John W. Eaton <jwe@octave.org> |
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date | Sat, 07 Mar 2009 13:28:03 -0500 |
parents | bac14003d9bb |
children |
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subroutine zswap (n,zx,incx,zy,incy) c c interchanges two vectors. c jack dongarra, 3/11/78. c modified 12/3/93, array(1) declarations changed to array(*) c double complex zx(*),zy(*),ztemp integer i,incx,incy,ix,iy,n c if(n.le.0)return if(incx.eq.1.and.incy.eq.1)go to 20 c c code for unequal increments or equal increments not equal c to 1 c ix = 1 iy = 1 if(incx.lt.0)ix = (-n+1)*incx + 1 if(incy.lt.0)iy = (-n+1)*incy + 1 do 10 i = 1,n ztemp = zx(ix) zx(ix) = zy(iy) zy(iy) = ztemp ix = ix + incx iy = iy + incy 10 continue return c c code for both increments equal to 1 20 do 30 i = 1,n ztemp = zx(i) zx(i) = zy(i) zy(i) = ztemp 30 continue return end