SLASET - initialize an m-by-n matrix A to BETA on the
diagonal and ALPHA on the offdiagonals
SYNOPSIS
SUBROUTINE SLASET( UPLO, M, N, ALPHA, BETA, A, LDA )
CHARACTER UPLO
INTEGER LDA, M, N
REAL ALPHA, BETA
REAL A( LDA, * )
PURPOSE
SLASET initializes an m-by-n matrix A to BETA on the diag
onal 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) REAL
The constant to which the offdiagonal elements are
to be set.
BETA (input) REAL
The constant to which the diagonal elements are to
be set.
A (input/output) 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).
The leading dimension of the array A. LDA >=
max(1,M).
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