Contents

• NAME
• SYNOPSIS
  • F95 INTERFACE
  • C INTERFACE
• PURPOSE
• ARGUMENTS

NAME

     zscal - Compute y := alpha * y

SYNOPSIS

     SUBROUTINE ZSCAL(N, ALPHA, Y, INCY)

     DOUBLE COMPLEX ALPHA
     DOUBLE COMPLEX Y(*)
     INTEGER N, INCY

     SUBROUTINE ZSCAL_64(N, ALPHA, Y, INCY)

     DOUBLE COMPLEX ALPHA
     DOUBLE COMPLEX Y(*)
     INTEGER*8 N, INCY

  F95 INTERFACE
     SUBROUTINE SCAL([N], ALPHA, Y, [INCY])

     COMPLEX(8) :: ALPHA
     COMPLEX(8), DIMENSION(:) :: Y
     INTEGER :: N, INCY

     SUBROUTINE SCAL_64([N], ALPHA, Y, [INCY])

     COMPLEX(8) :: ALPHA
     COMPLEX(8), DIMENSION(:) :: Y
     INTEGER(8) :: N, INCY

  C INTERFACE
     #include <sunperf.h>

     void zscal(int n, doublecomplex  *alpha,  doublecomplex  *y,
               int incy);

     void zscal_64(long n,  doublecomplex  *alpha,  doublecomplex
               *y, long incy);

PURPOSE

     zscal Compute y := alpha * y where alpha is a scalar  and  y
     is an n-vector.

ARGUMENTS

     N (input)
               On entry, N specifies the number  of  elements  in
               the  vector.   N must be at least one for the sub-
               routine to have any visible effect.  Unchanged  on
               exit.

     ALPHA (input)
               On  entry,  ALPHA  specifies  the  scalar   alpha.
               Unchanged on exit.

     Y (input/output)
               ( 1 + ( n - 1 )*abs( INCY  )  ).   On  entry,  the
               incremented  array Y must contain the vector y. On
               exit, Y is overwritten by the updated vector y.

     INCY (input)
               On entry, INCY specifies  the  increment  for  the
               elements  of  Y. INCY must not be zero.  Unchanged
               on exit.