slaset(3S)

NAME
     SLASET - initialize an m-by-n matrix A to BETA on the diagonal and ALPHA
     on the offdiagonals

SYNOPSIS
     SUBROUTINE SLASET( UPLO, M, N, ALPHA, BETA, A, LDA )

         CHARACTER      UPLO

         INTEGER        LDA, M, N

         REAL           ALPHA, BETA

         REAL           A( LDA, * )

IMPLEMENTATION
     These routines are part of the SCSL Scientific Library and can be loaded
     using either the -lscs or the -lscs_mp option.  The -lscs_mp option
     directs the linker to use the multi-processor version of the library.

     When linking to SCSL with -lscs or -lscs_mp, the default integer size is
     4 bytes (32 bits). Another version of SCSL is available in which integers
     are 8 bytes (64 bits).  This version allows the user access to larger
     memory sizes and helps when porting legacy Cray codes.  It can be loaded
     by using the -lscs_i8 option or the -lscs_i8_mp option. A program may use
     only one of the two versions; 4-byte integer and 8-byte integer library
     calls cannot be mixed.

PURPOSE
     SLASET initializes an m-by-n matrix A to BETA on the diagonal and ALPHA
     on the offdiagonals.

ARGUMENTS
     UPLO    (input) 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.

     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) REAL
             The constant to which the offdiagonal elements are to be set.

     BETA    (input) REAL
             The constant to which the diagonal elements are to be set.
     A       (input/output) 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).

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

SEE ALSO
     INTRO_LAPACK(3S), INTRO_SCSL(3S)

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