zlaset (3)

Functions/Subroutines

subroutine zlaset (UPLO, M, N, ALPHA, BETA, A, LDA)

ZLASET initializes the off-diagonal elements and the diagonal elements of a matrix to given values.

subroutine zlaset (characterUPLO, integerM, integerN, complex*16ALPHA, complex*16BETA, complex*16, dimension( lda, * )A, integerLDA)

ZLASET initializes the off-diagonal elements and the diagonal elements of a matrix to given values.

Purpose:

 ZLASET initializes a 2-D array 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 lower triangle
                      is unchanged.
          = 'L':      Lower triangular part is set. The upper triangle
                      is unchanged.
          Otherwise:  All of the matrix A is set.

M

          M is INTEGER
          On entry, M specifies the number of rows of A.

N

          N is INTEGER
          On entry, N specifies the number of columns of A.

ALPHA

          ALPHA is COMPLEX*16
          All the offdiagonal array elements are set to ALPHA.

BETA

          BETA is COMPLEX*16
          All the diagonal array elements are set to BETA.

A

          A is COMPLEX*16 array, dimension (LDA,N)
          On entry, the m by n matrix A.
          On exit, A(i,j) = ALPHA, 1 <= i <= m, 1 <= j <= n, i.ne.j;
                   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.

Date:

September 2012

Definition at line 107 of file zlaset.f.

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