Source module last modified on Thu, 2 Jul 1998, 23:17;
HTML image of Fortran source automatically generated by
for2html on Sun, 23 Jun 2002, 15:10.
double complex function zdotc(n,zx,incx,zy,incy)
#
# forms the dot product of a vector.
# jack dongarra, 3/11/78.
# modified 12/3/93, array(1) declarations changed to array(*)
#
double complex zx(*),zy(*),ztemp
integer i,incx,incy,ix,iy,n
ztemp = (0.0d0,0.0d0)
zdotc = (0.0d0,0.0d0)
if(n<=0)return
if(incx==1&&incy==1)go to 20
#
# code for unequal increments or equal increments
# not equal to 1
#
ix = 1
iy = 1
if(incx<0)ix = (-n+1)*incx + 1
if(incy<0)iy = (-n+1)*incy + 1
do 10 i = 1,n
ztemp = ztemp + dconjg(zx(ix))*zy(iy)
ix = ix + incx
iy = iy + incy
10 continue
zdotc = ztemp
return
#
# code for both increments equal to 1
#
20 do 30 i = 1,n
ztemp = ztemp + dconjg(zx(i))*zy(i)
30 continue
zdotc = ztemp
return
end