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dlauu2 (3)
  • >> dlauu2 (3) ( Solaris man: Библиотечные вызовы )
  • 
    NAME
         dlauu2 - compute the product U * U' or L'  *  L,  where  the
         triangular  factor  U  or  L is stored in the upper or lower
         triangular part of the array A
    
    SYNOPSIS
         SUBROUTINE DLAUU2( UPLO, N, A, LDA, INFO )
    
         CHARACTER UPLO
    
         INTEGER INFO, LDA, N
    
         DOUBLE PRECISION A( LDA, * )
    
    
    
         #include <sunperf.h>
    
         void dlauu2(char uplo, int  n,  double  *da,  int  lda,  int
                   *info) ;
    
    PURPOSE
         DLAUU2 computes the product U * U' or L' * L, where the tri-
         angular  factor  U or L is stored in the upper or lower tri-
         angular part of the array A.
    
         If UPLO = 'U' or 'u' then the upper triangle of  the  result
         is stored, overwriting the factor U in A.
         If UPLO = 'L' or 'l' then the lower triangle of  the  result
         is stored, overwriting the factor L in A.
    
         This is the unblocked form of the algorithm, calling Level 2
         BLAS.
    
    
    ARGUMENTS
         UPLO      (input) CHARACTER*1
                   Specifies whether the triangular factor stored  in
                   the array A is upper or lower triangular:
                   = 'U':  Upper triangular
                   = 'L':  Lower triangular
    
         N         (input) INTEGER
                   The order of the triangular factor U or L.   N  >=
                   0.
    
         A         (input/output) DOUBLE PRECISION  array,  dimension
                   (LDA,N)
                   On entry, the triangular factor U or L.  On  exit,
                   if  UPLO  =  'U',  the  upper  triangle  of  A  is
                   overwritten with the upper triangle of the product
                   U  * U'; if UPLO = 'L', the lower triangle of A is
                   overwritten with the lower triangle of the product
                   L' * L.
    
         LDA       (input) INTEGER
                   The leading dimension of  the  array  A.   LDA  >=
                   max(1,N).
    
         INFO      (output) INTEGER
                   = 0: successful exit
                   < 0: if INFO = -k, the k-th argument had an  ille-
                   gal value
    
    
    
    


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