Developer Reference for Intel® oneAPI Math Kernel Library for Fortran

ID 766686
Date 6/24/2024
Public

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p?scal

Computes a product of a distributed vector by a scalar.

Syntax

call psscal(n, a, x, ix, jx, descx, incx)

call pdscal(n, a, x, ix, jx, descx, incx)

call pcscal(n, a, x, ix, jx, descx, incx)

call pzscal(n, a, x, ix, jx, descx, incx)

call pcsscal(n, a, x, ix, jx, descx, incx)

call pzdscal(n, a, x, ix, jx, descx, 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) INTEGER. The length of distributed vector sub(x), n0.

a

(global) REAL for psscal and pcsscal

DOUBLE PRECISION for pdscal and pzdscal

COMPLEX for pcscal

DOUBLE COMPLEX for pzscal

Specifies the scalar a.

x

(local) REAL for psscal

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) INTEGER. 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) INTEGER array of dimension 9. The array descriptor of the distributed matrix X.

incx

(global) INTEGER. 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)