LAPACK  3.5.0
LAPACK: Linear Algebra PACKage
 All Classes Files Functions Variables Typedefs Macros
dlaset.f File Reference

Go to the source code of this file.

Functions/Subroutines

subroutine dlaset (UPLO, M, N, ALPHA, BETA, A, LDA)
 DLASET initializes the off-diagonal elements and the diagonal elements of a matrix to given values. More...
 

Function/Subroutine Documentation

subroutine dlaset ( character  UPLO,
integer  M,
integer  N,
double precision  ALPHA,
double precision  BETA,
double precision, dimension( lda, * )  A,
integer  LDA 
)

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

Download DLASET + dependencies [TGZ] [ZIP] [TXT]
Purpose:
 DLASET initializes an m-by-n matrix A to BETA on the diagonal and
 ALPHA on the offdiagonals.
Parameters
[in]UPLO
          UPLO is 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.
[in]M
          M is INTEGER
          The number of rows of the matrix A.  M >= 0.
[in]N
          N is INTEGER
          The number of columns of the matrix A.  N >= 0.
[in]ALPHA
          ALPHA is DOUBLE PRECISION
          The constant to which the offdiagonal elements are to be set.
[in]BETA
          BETA is DOUBLE PRECISION
          The constant to which the diagonal elements are to be set.
[in,out]A
          A is 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).
[in]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 111 of file dlaset.f.

Here is the call graph for this function: