dlaset.f (3)

Functions/Subroutines

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

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

subroutine dlaset (characterUPLO, integerM, integerN, double precisionALPHA, double precisionBETA, double precision, dimension( lda, * )A, integerLDA)

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

Purpose:

 DLASET 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 DOUBLE PRECISION
          The constant to which the offdiagonal elements are to be set.

BETA

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

A

          A is DOUBLE PRECISION 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 dlaset.f.

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