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dlaset (3)
  • >> dlaset (3) ( Solaris man: Библиотечные вызовы )
  • 
    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).
    
    
    
    


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