p?scal

Developer Reference for Intel® oneAPI Math Kernel Library for C

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ID 766684

Date 12/16/2022

Version

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p?scal

Computes a product of a distributed vector by a scalar.

Syntax

void psscal (const MKL_INT *n , const float *a , float *x , const MKL_INT *ix , const MKL_INT *jx , const MKL_INT *descx , const MKL_INT *incx );

void pdscal (const MKL_INT *n , const double *a , double *x , const MKL_INT *ix , const MKL_INT *jx , const MKL_INT *descx , const MKL_INT *incx );

void pcscal (const MKL_INT *n , const MKL_Complex8 *a , MKL_Complex8 *x , const MKL_INT *ix , const MKL_INT *jx , const MKL_INT *descx , const MKL_INT *incx );

void pzscal (const MKL_INT *n , const MKL_Complex16 *a , MKL_Complex16 *x , const MKL_INT *ix , const MKL_INT *jx , const MKL_INT *descx , const MKL_INT *incx );

void pcsscal (const MKL_INT *n , const float *a , MKL_Complex8 *x , const MKL_INT *ix , const MKL_INT *jx , const MKL_INT *descx , const MKL_INT *incx );

void pzdscal (const MKL_INT *n , const double *a , MKL_Complex16 *x , const MKL_INT *ix , const MKL_INT *jx , const MKL_INT *descx , const MKL_INT *incx );

Include Files

mkl_pblas.h

Description

The p?scal routines multiplies a n-element distributed vector sub(x) by the scalar a:

sub(x) = a*sub(x),

where sub(x) denotes X(ix, jx:jx+n-1) if incx=m_x, and X(ix: ix+n-1, jx) if incx= 1.

Input Parameters

n

(global) The length of distributed vector sub(x), n≥0.

a

(global) and pcsscal

Specifies the scalar a.

x

(local)

Array, size (jx-1)*m_x + ix+(n-1)*abs(incx)).

This array contains the entries of the distributed vector sub(x).

ix, jx

(global) The row and column indices in the distributed matrix X indicating the first row and the first column of the submatrix sub(X), respectively.

descx

(global and local) array of dimension 9. The array descriptor of the distributed matrix X.

incx

(global) Specifies the increment for the elements of sub(x). Only two values are supported, namely 1 and m_x. incx must not be zero.

Output Parameters

x: Overwritten by the updated distributed vector sub(x)

Parent topic: PBLAS Level 1 Routines

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Developer Reference for Intel® oneAPI Math Kernel Library for C

p?scal