38 lines
894 B
Fortran
38 lines
894 B
Fortran
complex function cdotuf(n,cx,incx,cy,incy)
|
|
c
|
|
c forms the dot product of two vectors.
|
|
c jack dongarra, linpack, 3/11/78.
|
|
c modified 12/3/93, array(1) declarations changed to array(*)
|
|
c
|
|
complex cx(*),cy(*),ctemp
|
|
integer i,incx,incy,ix,iy,n
|
|
c
|
|
ctemp = (0.0,0.0)
|
|
cdotuf = (0.0,0.0)
|
|
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
|
|
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
|
|
ctemp = ctemp + cx(ix)*cy(iy)
|
|
ix = ix + incx
|
|
iy = iy + incy
|
|
10 continue
|
|
cdotuf = ctemp
|
|
return
|
|
c
|
|
c code for both increments equal to 1
|
|
c
|
|
20 do 30 i = 1,n
|
|
ctemp = ctemp + cx(i)*cy(i)
|
|
30 continue
|
|
cdotuf = ctemp
|
|
return
|
|
end
|