?laset

Developer Reference for Intel® oneAPI Math Kernel Library for Fortran

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ID 766686

Date 10/15/2026

Version

Public

?laset

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

Syntax

call slaset(uplo, m, n, alpha, beta, a, lda)
call dlaset(uplo, m, n, alpha, beta, a, lda)
call claset(uplo, m, n, alpha, beta, a, lda)
call zlaset(uplo, m, n, alpha, beta, a, lda)

Include Files

mkl.fi

Description

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

Input Parameters

The data types are given for the Fortran interface.

uplo

CHARACTER*1 . 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: A ll of the matrix A is set.

m: INTEGER. The number of rows in the matrix A. The value of m must be at least zero.

n: INTEGER. The number of columns in the matrix A. The value of n must be at least zero.

alpha , beta: REAL for slaset DOUBLE PRECISION for dlaset COMPLEX for claset DOUBLE COMPLEX for zlaset . The constants to which the off-diagonal and diagonal elements are to be set, respectively.
a: REAL for slaset DOUBLE PRECISION for dlaset COMPLEX for claset DOUBLE COMPLEX for zlaset . Array, DIMENSION ( lda , n ). 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

INTEGER . The leading dimension of the array a .

lda ≥ max(1, m ) .

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

No return value.

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Developer Reference for Intel® oneAPI Math Kernel Library for Fortran

?laset

Syntax

Include Files

Description

Input Parameters

Output Parameters

Return Values