subroutine cscal(n,ca,cx,incx)
c
c scales a vector by a constant.
c jack dongarra, linpack, 3/11/78.
c modified 3/93 to return if incx .le. 0.
c modified 12/3/93, array(1) declarations changed to array(*)
c
complex ca,cx(*)
integer i,incx,n,nincx
c
if( n.le.0 .or. incx.le.0 )return
if(incx.eq.1)go to 20
c
c code for increment not equal to 1
c
nincx = n*incx
do 10 i = 1,nincx,incx
cx(i) = ca*cx(i)
10 continue
return
c
c code for increment equal to 1
c
20 do 30 i = 1,n
cx(i) = ca*cx(i)
30 continue
return
end
