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zdscal.f
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1996-09-28
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662b
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31 lines
subroutine zdscal(n,da,zx,incx)
c
c scales a vector by a constant.
c jack dongarra, 3/11/78.
c modified to correct problem with negative increment, 8/21/90.
c
double complex zx(1)
double precision da
integer i,incx,ix,n
c
if(n.le.0)return
if(incx.eq.1)go to 20
c
c code for increment not equal to 1
c
ix = 1
if(incx.lt.0)ix = (-n+1)*incx + 1
do 10 i = 1,n
zx(ix) = dcmplx(da,0.0d0)*zx(ix)
ix = ix + incx
10 continue
return
c
c code for increment equal to 1
c
20 do 30 i = 1,n
zx(i) = dcmplx(da,0.0d0)*zx(i)
30 continue
return
end