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.
subroutine srot (n,sx,incx,sy,incy,c,s)
#
# applies a plane rotation.
# jack dongarra, linpack, 3/11/78.
# modified 12/3/93, array(1) declarations changed to array(*)
#
real sx(*),sy(*),stemp,c,s
integer i,incx,incy,ix,iy,n
#
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
stemp = c*sx(ix) + s*sy(iy)
sy(iy) = c*sy(iy) - s*sx(ix)
sx(ix) = stemp
ix = ix + incx
iy = iy + incy
10 continue
return
#
# code for both increments equal to 1
#
20 do 30 i = 1,n
stemp = c*sx(i) + s*sy(i)
sy(i) = c*sy(i) - s*sx(i)
sx(i) = stemp
30 continue
return
end