DLASET(3f)

NAME
DLASET - an m-by-n matrix A to BETA on the diagonal and ALPHA on the offdiagonals

SYNOPSIS

SUBROUTINE DLASET(
    UPLO, M, N, ALPHA, BETA, A, LDA )

CHARACTER
    UPLO

INTEGER
    LDA, M, N

DOUBLE
    PRECISION ALPHA, BETA

DOUBLE
    PRECISION A( LDA, * )

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

ARGUMENTS

UPLO    (input) 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       (input) INTEGER
    The number of rows of the matrix A. M >= 0.

N       (input) INTEGER
    The number of columns of the matrix A. N >= 0.

ALPHA   (input) DOUBLE PRECISION
    The constant to which the offdiagonal elements are to be set.

BETA    (input) DOUBLE PRECISION
    The constant to which the diagonal elements are to be set.

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