DLAZRO (3lapack)

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).