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strtri (3)
  • >> strtri (3) ( Solaris man: Библиотечные вызовы )
  • 
    NAME
         strtri - compute the inverse of a real upper or  lower  tri-
         angular matrix A
    
    SYNOPSIS
         SUBROUTINE STRTRI( UPLO, DIAG, N, A, LDA, INFO )
    
         CHARACTER DIAG, UPLO
    
         INTEGER INFO, LDA, N
    
         REAL A( LDA, * )
    
    
    
         #include <sunperf.h>
    
         void strtri(char uplo, char diag, int n, float *sa, int lda,
                   int *info) ;
    
    PURPOSE
         STRTRI computes the inverse of a real upper  or  lower  tri-
         angular matrix A.
    
         This is the Level 3 BLAS version of the algorithm.
    
    
    ARGUMENTS
         UPLO      (input) CHARACTER*1
                   = 'U':  A is upper triangular;
                   = 'L':  A is lower triangular.
    
         DIAG      (input) CHARACTER*1
                   = 'N':  A is non-unit triangular;
                   = 'U':  A is unit triangular.
    
         N         (input) INTEGER
                   The order of the matrix A.  N >= 0.
    
         A         (input/output) REAL array, dimension (LDA,N)
                   On entry, the triangular matrix A.  If UPLO = 'U',
                   the  leading  N-by-N  upper triangular part of the
                   array A contains the upper triangular matrix,  and
                   the  strictly  lower  triangular  part of A is not
                   referenced.  If UPLO =  'L',  the  leading  N-by-N
                   lower  triangular part of the array A contains the
                   lower triangular matrix, and  the  strictly  upper
                   triangular part of A is not referenced.  If DIAG =
                   'U', the diagonal  elements  of  A  are  also  not
                   referenced  and are assumed to be 1.  On exit, the
                   (triangular) inverse of the  original  matrix,  in
                   the same storage format.
    
         LDA       (input) INTEGER
                   The leading dimension of  the  array  A.   LDA  >=
                   max(1,N).
    
         INFO      (output) INTEGER
                   = 0: successful exit
                   < 0: if INFO = -i, the i-th argument had an  ille-
                   gal value
                   > 0: if INFO = i, A(i,i)  is  exactly  zero.   The
                   triangular  matrix is singular and its inverse can
                   not be computed.
    
    
    
    


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