NAME

DLAZRO - initialize a 2-D array A to BETA on the diagonal and ALPHA on the offdiagonals

SYNOPSIS

SUBROUTINE DLAZRO(
M, N, ALPHA, BETA, A, LDA )

INTEGER LDA, M, N

DOUBLE PRECISION ALPHA, BETA

DOUBLE PRECISION A( LDA, ∗ )

PURPOSE

DLAZRO initializes a 2-D array A to BETA on the diagonal and ALPHA on the offdiagonals. 
 

ARGUMENTS

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       (output) DOUBLE PRECISION array, dimension (LDA,N)
On exit, the leading m by n submatrix of A is set such that A(i,j) = ALPHA,  1 <= i <= m, 1 <= j <= n, i <> j A(i,i) = BETA,   1 <= i <= min(m,n).

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

  —  LAPACK version 1.1  —  02 April 1993