--- rpl/lapack/blas/zscal.f	2017/06/17 10:53:46	1.13
+++ rpl/lapack/blas/zscal.f	2023/08/07 08:38:46	1.16
@@ -27,6 +27,32 @@
 *>    ZSCAL scales a vector by a constant.
 *> \endverbatim
 *
+*  Arguments:
+*  ==========
+*
+*> \param[in] N
+*> \verbatim
+*>          N is INTEGER
+*>         number of elements in input vector(s)
+*> \endverbatim
+*>
+*> \param[in] ZA
+*> \verbatim
+*>          ZA is COMPLEX*16
+*>           On entry, ZA specifies the scalar alpha.
+*> \endverbatim
+*>
+*> \param[in,out] ZX
+*> \verbatim
+*>          ZX is COMPLEX*16 array, dimension ( 1 + ( N - 1 )*abs( INCX ) )
+*> \endverbatim
+*>
+*> \param[in] INCX
+*> \verbatim
+*>          INCX is INTEGER
+*>         storage spacing between elements of ZX
+*> \endverbatim
+*
 *  Authors:
 *  ========
 *
@@ -35,8 +61,6 @@
 *> \author Univ. of Colorado Denver
 *> \author NAG Ltd.
 *
-*> \date December 2016
-*
 *> \ingroup complex16_blas_level1
 *
 *> \par Further Details:
@@ -52,10 +76,9 @@
 *  =====================================================================
       SUBROUTINE ZSCAL(N,ZA,ZX,INCX)
 *
-*  -- Reference BLAS level1 routine (version 3.7.0) --
+*  -- Reference BLAS level1 routine --
 *  -- Reference BLAS is a software package provided by Univ. of Tennessee,    --
 *  -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
-*     December 2016
 *
 *     .. Scalar Arguments ..
       COMPLEX*16 ZA
@@ -70,7 +93,11 @@
 *     .. Local Scalars ..
       INTEGER I,NINCX
 *     ..
-      IF (N.LE.0 .OR. INCX.LE.0) RETURN
+*     .. Parameters ..
+      COMPLEX*16 ONE
+      PARAMETER (ONE= (1.0D+0,0.0D+0))
+*     ..
+      IF (N.LE.0 .OR. INCX.LE.0 .OR. ZA.EQ.ONE) RETURN
       IF (INCX.EQ.1) THEN
 *
 *        code for increment equal to 1
@@ -88,4 +115,7 @@
          END DO
       END IF
       RETURN
+*
+*     End of ZSCAL
+*
       END