p?scal

Developer Reference for Intel® oneAPI Math Kernel Library for C

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ID 766684

Date 10/15/2026

Version

Public

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

DOUBLE PRECISION for pdscal and pzdscal COMPLEX for pcscal DOUBLE COMPLEX for pzscal Specifies the scalar a .

x

(local)

DOUBLE PRECISION for pdscal COMPLEX for pcscal and pcsscal DOUBLE COMPLEX for pzscal and pzdscal 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)

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Developer Reference for Intel® oneAPI Math Kernel Library for C

p?scal

Syntax

Include Files

Description

Input Parameters

Output Parameters