Mercurial > octave-nkf
view libcruft/blas/zaxpy.f @ 5210:996a08a3eb06 ss-2-9-0
[project @ 2005-03-15 20:46:03 by jwe]
author | jwe |
---|---|
date | Tue, 15 Mar 2005 20:46:03 +0000 |
parents | bac14003d9bb |
children |
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subroutine zaxpy(n,za,zx,incx,zy,incy) c c constant times a vector plus a vector. c jack dongarra, 3/11/78. c modified 12/3/93, array(1) declarations changed to array(*) c double complex zx(*),zy(*),za integer i,incx,incy,ix,iy,n double precision dcabs1 if(n.le.0)return if (dcabs1(za) .eq. 0.0d0) return if (incx.eq.1.and.incy.eq.1)go to 20 c c code for unequal increments or equal increments c not equal 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 zy(iy) = zy(iy) + za*zx(ix) ix = ix + incx iy = iy + incy 10 continue return c c code for both increments equal to 1 c 20 do 30 i = 1,n zy(i) = zy(i) + za*zx(i) 30 continue return end