integer i,incx,ix,n if(n.le.0)return if(incx.eq.1)go to 20 c code for increment not equal to 1 ix = 1 if(incx.lt.0)ix = (-n+1)*incx + 1 do 10 i = 1,n zx(ix) = za*zx(ix) ix = ix + incx 10 continue return c code for increment equal to 1 20 do 30 i = 1,n zx(i) = za*zx(i) 30 continue return end