?laset

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: All of the matrix A is set.

m

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

n

INTEGER. The number of columns of the matrix A.

n≥ 0.

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).

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_ij = beta, 1≤i≤min(m, n).