Math Vector Library
Programming Reference Manual C/C++
Version 1.1 DD-00002-011

15.6 vsmul - Vector scalar multiplication αx

#include <mvec.h> 
 
void vsmul (int n, double *restrict y, int incy, const double *restrict x, int incx, double a); 
void vsmulf(int n, float *restrict y, int incy, const float *restrict x, int incx, float a); 
 
void vsmul_64 (long n, double *restrict y, long incy, double *restrict x, long incx, double a); 
void vsmulf_64(long n, float *restrict y, long incy, float *restrict x, long incx, float a);

Given an input vector x  and a scalar constant α and a result vector y  , this function computes:

y= αx

15.6.1 Parameters

N - INTEGER

ENTRY: Number of elements of x  and y  .
CONSTRAINT: n ≥1  .

Y - ARRAY OF REAL

EXIT: Result vector y  .
CONSTRAINT: Must contain n× incy  elements.
CONSTRAINT: Must not overlap with array x  .

INCY - INTEGER

ENTRY: Stride for the vector y  .
CONSTRAINT: incy̸= 0  .
BEHAVIOR: A negative stride will traverse the array in reverse.

X - ARRAY OF REAL

ENTRY: Input vector x  .
CONSTRAINT: Must contain n× incx  elements.
CONSTRAINT: Must not overlap with array y  .

INCX - INTEGER

ENTRY: Stride for the vector x  .
CONSTRAINT: incx̸= 0  .
BEHAVIOR: A negative stride will traverse the array in reverse.

A - REAL

ENTRY: Scalar constant α .