subroutine csscal(n,sa,cx,incx) c c scales a complex vector by a real 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 cx(*) real sa 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) = cmplx(sa*real(cx(i)),sa*aimag(cx(i))) 10 continue return c c code for increment equal to 1 c 20 do 30 i = 1,n cx(i) = cmplx(sa*real(cx(i)),sa*aimag(cx(i))) 30 continue return end