SRC/dlaset.f(3)

NAME
SRC/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 (character uplo, integer m, integer n, double precision alpha, double precision beta, double precision, dimension( lda, * ) a, integer lda)

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.

Definition at line 109 of file dlaset.f.

Author

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