dlaset.f(3)

NAME
dlaset.f -

SYNOPSIS

  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.

Function/Subroutine Documentation

  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.

Author

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