Developer Reference for Intel® oneAPI Math Kernel Library for C

ID 766684
Date 12/16/2022
Public

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p?laset

Initializes the offdiagonal elements of a matrix to alpha and the diagonal elements to beta.

Syntax

void pslaset (char *uplo , MKL_INT *m , MKL_INT *n , float *alpha , float *beta , float *a , MKL_INT *ia , MKL_INT *ja , MKL_INT *desca );

void pdlaset (char *uplo , MKL_INT *m , MKL_INT *n , double *alpha , double *beta , double *a , MKL_INT *ia , MKL_INT *ja , MKL_INT *desca );

void pclaset (char *uplo , MKL_INT *m , MKL_INT *n , MKL_Complex8 *alpha , MKL_Complex8 *beta , MKL_Complex8 *a , MKL_INT *ia , MKL_INT *ja , MKL_INT *desca );

void pzlaset (char *uplo , MKL_INT *m , MKL_INT *n , MKL_Complex16 *alpha , MKL_Complex16 *beta , MKL_Complex16 *a , MKL_INT *ia , MKL_INT *ja , MKL_INT *desca );

Include Files
  • mkl_scalapack.h
Description

The p?lasetfunction initializes an m-by-n distributed matrix sub(A) denoting A(ia:ia+m-1, ja:ja+n-1) to beta on the diagonal and alpha on the offdiagonals.

Input Parameters
uplo

(global)

Specifies the part of the distributed matrix sub(A) to be set:

if uplo = 'U': upper triangular part; the strictly lower triangular part of sub(A) is not changed;

if uplo = 'L': lower triangular part; the strictly upper triangular part of sub(A) is not changed.

Otherwise: all of the matrix sub(A) is set.

m

(global)

The number of rows in the distributed matrix sub(A). (m0).

n

(global)

The number of columns in the distributed matrix sub(A). (n0).

alpha

(global).

The constant to which the offdiagonal elements are to be set.

beta

(global).

The constant to which the diagonal elements are to be set.

Output Parameters
a

(local).

Pointer into the local memory to an array of size lld_a * LOCc(ja+n-1).

This array contains the local pieces of the distributed matrix sub(A) to be set. On exit, the leading m-by-n matrix sub(A) is set as follows:

if uplo = 'U', A(ia+i-1, ja+j-1) = alpha, 1≤ij-1, 1≤jn,

if uplo = 'L', A(ia+i-1, ja+j-1) = alpha, j+1≤im, 1≤jn,

otherwise, A(ia+i-1, ja+j-1) = alpha, 1≤im, 1≤jn, ia+ija+j, and, for all uplo, A(ia+i-1, ja+i-1) = beta, 1≤i≤min(m,n).

ia, ja

(global)

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

desca

(global and local)

Array of size dlen_. The array descriptor for the distributed matrix A.

See Also