slaset.f (3)

Functions/Subroutines

subroutine slaset (UPLO, M, N, ALPHA, BETA, A, LDA)

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

subroutine slaset (characterUPLO, integerM, integerN, realALPHA, realBETA, real, dimension( lda, * )A, integerLDA)

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

Purpose:

 SLASET initializes an m-by-n matrix A to BETA on the diagonal and
 ALPHA on the offdiagonals.

Parameters:

UPLO

          UPLO is CHARACTER*1
          Specifies the part of the matrix A to be set.
          = 'U':      Upper triangular part is set; the strictly lower
                      triangular part of A is not changed.
          = '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

          M is INTEGER
          The number of rows of the matrix A.  M >= 0.

N

          N is INTEGER
          The number of columns of the matrix A.  N >= 0.

ALPHA

          ALPHA is REAL
          The constant to which the offdiagonal elements are to be set.

BETA

          BETA is REAL
          The constant to which the diagonal elements are to be set.

A

          A is REAL array, dimension (LDA,N)
          On exit, the leading m-by-n submatrix of A is set as follows:

          if UPLO = 'U', A(i,j) = ALPHA, 1<=i<=j-1, 1<=j<=n,
          if UPLO = 'L', A(i,j) = ALPHA, j+1<=i<=m, 1<=j<=n,
          otherwise,     A(i,j) = ALPHA, 1<=i<=m, 1<=j<=n, i.ne.j,

          and, for all UPLO, A(i,i) = BETA, 1<=i<=min(m,n).

LDA

          LDA is INTEGER
          The leading dimension of the array A.  LDA >= max(1,M).

Author:

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Date:

September 2012

Definition at line 111 of file slaset.f.

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