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NAME
     dlaset - initialize an m-by-n matrix A to BETA on the diago-
     nal and ALPHA on the offdiagonals

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

     CHARACTER UPLO

     INTEGER LDA, M, N

     DOUBLE PRECISION ALPHA, BETA

     DOUBLE PRECISION A( LDA, * )



     #include <sunperf.h>

     void dlaset(char uplo, int m, int n,  double  alpha,  double
               dbeta, double *da, int lda) ;

PURPOSE
     DLASET initializes an m-by-n matrix A to BETA on the  diago-
     nal 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) 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         (input/output) 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).

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

Партнёры:

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