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SUBROUTINE ZSCAL(N,ZA,ZX,INCX)
* .. Scalar Arguments ..
DOUBLE COMPLEX ZA
INTEGER INCX,N
* ..
* .. Array Arguments ..
DOUBLE COMPLEX ZX(*)
* ..
*
* Purpose
* =======
*
* ZSCAL scales a vector by a constant.
*
* Further Details
* ===============
*
* jack dongarra, 3/11/78.
* modified 3/93 to return if incx .le. 0.
* modified 12/3/93, array(1) declarations changed to array(*)
*
* =====================================================================
*
* .. Local Scalars ..
INTEGER I,IX
* ..
IF (N.LE.0 .OR. INCX.LE.0) RETURN
IF (INCX.EQ.1) GO TO 20
*
* code for increment not equal to 1
*
IX = 1
DO 10 I = 1,N
ZX(IX) = ZA*ZX(IX)
IX = IX + INCX
10 CONTINUE
RETURN
*
* code for increment equal to 1
*
20 DO 30 I = 1,N
ZX(I) = ZA*ZX(I)
30 CONTINUE
RETURN
END
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