?laset

Developer Reference for Intel® oneAPI Math Kernel Library for C

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ID 766684

Date 11/07/2023

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?laset

Initializes the off-diagonal elements and the diagonal elements of a matrix to given values.

Syntax

lapack_int LAPACKE_slaset (int matrix_layout , char uplo , lapack_int m , lapack_int n , float alpha , float beta , float * a , lapack_int lda );

lapack_int LAPACKE_dlaset (int matrix_layout , char uplo , lapack_int m , lapack_int n , double alpha , double beta , double * a , lapack_int lda );

lapack_int LAPACKE_claset (int matrix_layout , char uplo , lapack_int m , lapack_int n , lapack_complex_float alpha , lapack_complex_float beta , lapack_complex_float * a , lapack_int lda );

lapack_int LAPACKE_zlaset (int matrix_layout , char uplo , lapack_int m , lapack_int n , lapack_complex_double alpha , lapack_complex_double beta , lapack_complex_double * a , lapack_int lda );

Include Files

mkl.h

Description

The routine initializes an m-by-n matrix A to beta on the diagonal and alpha on the off-diagonals.

Input Parameters

A <datatype> placeholder, if present, is used for the C interface data types in the C interface section above. See C Interface Conventions for the C interface principal conventions and type definitions.

matrix_layout

Specifies whether matrix storage layout is row major (LAPACK_ROW_MAJOR) or column major ( LAPACK_COL_MAJOR ).

uplo

Specifies the part of the matrix A to be set.

If uplo = 'U', upper triangular part is set; the strictly lower triangular part of A is not changed.

If uplo = 'L': lower triangular part is set; the strictly upper triangular part of A is not changed.

Otherwise: All of the matrix A is set.

m

The number of rows of the matrix A. m≥ 0.

n

The number of columns of the matrix A.

n≥ 0.

alpha, beta

The constants to which the off-diagonal and diagonal elements are to be set, respectively.

a

Array, size at least max(1, lda*n) for column major and max(1, lda*m) for row major layout.

The array a contains the m-by-n matrix A.

lda

The leading dimension of the array a.

lda≥ max(1,m) for column major layout and lda ≥ max(1,n) for row major layout.

Output Parameters

a

On exit, the leading m-by-n submatrix of A is set as follows:

if uplo = 'U', A_ij = alpha, 1≤i≤j-1, 1≤j≤n,

if uplo = 'L', A_ij = alpha, j+1≤i≤m, 1≤j≤n,

otherwise, A_ij = alpha, 1≤i≤m, 1≤j≤n, i≠j,

and, for all uplo, A_ii = beta, 1≤i≤min(m, n).

Return Values

This function returns a value info.

If info = 0, the execution is successful.

If info = i< 0, the i-th parameter had an illegal value.

If info = -1011, memory allocation error occurred.

Parent topic: LAPACK Auxiliary Routines

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Developer Reference for Intel® oneAPI Math Kernel Library for C

?laset

Syntax

Include Files

Description

Input Parameters

Output Parameters

Return Values