LAPACK 3.11.0
LAPACK: Linear Algebra PACKage

◆ slaset()

subroutine slaset ( character  UPLO,
integer  M,
integer  N,
real  ALPHA,
real  BETA,
real, dimension( lda, * )  A,
integer  LDA 
)

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

Download SLASET + dependencies [TGZ] [ZIP] [TXT]

Purpose:
 SLASET 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 REAL
          The constant to which the offdiagonal elements are to be set.
[in]BETA
          BETA is REAL
          The constant to which the diagonal elements are to be set.
[out]A
          A is 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).
[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.