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

NAME

dscal - Compute y := alpha * y

SYNOPSIS

  SUBROUTINE DSCAL( N, ALPHA, Y, INCY)
  INTEGER N, INCY
  DOUBLE PRECISION ALPHA
  DOUBLE PRECISION Y(*)

  SUBROUTINE DSCAL_64( N, ALPHA, Y, INCY)
  INTEGER*8 N, INCY
  DOUBLE PRECISION ALPHA
  DOUBLE PRECISION Y(*)

F95 INTERFACE

  SUBROUTINE SCAL( [N], ALPHA, Y, [INCY])
  INTEGER :: N, INCY
  REAL(8) :: ALPHA
  REAL(8), DIMENSION(:) :: Y

  SUBROUTINE SCAL_64( [N], ALPHA, Y, [INCY])
  INTEGER(8) :: N, INCY
  REAL(8) :: ALPHA
  REAL(8), DIMENSION(:) :: Y

C INTERFACE

#include <sunperf.h>

void dscal(int n, double alpha, double *y, int incy);

void dscal_64(long n, double alpha, double *y, long incy);

PURPOSE

dscal 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 subroutine 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.