SRC/slaset.f(3)

NAME
SRC/slaset.f

SYNOPSIS

  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.

Function/Subroutine Documentation

  subroutine slaset (character uplo, integer m, integer n, real alpha, real beta, real, dimension( lda, * ) a, integer lda)

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.

Definition at line 109 of file slaset.f.

Author

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