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spotri (3)
  • >> spotri (3) ( Solaris man: Библиотечные вызовы )
  • 
    NAME
         spotri - compute the inverse of a  real  symmetric  positive
         definite  matrix  A  using  the  Cholesky  factorization A =
         U**T*U or A = L*L**T computed by SPOTRF
    
    SYNOPSIS
         SUBROUTINE SPOTRI( UPLO, N, A, LDA, INFO )
    
         CHARACTER UPLO
    
         INTEGER INFO, LDA, N
    
         REAL A( LDA, * )
    
    
    
         #include <sunperf.h>
    
         void spotri(char uplo, int n, float *sa, int lda, int *info)
                   ;
    
    PURPOSE
         SPOTRI computes the inverse of  a  real  symmetric  positive
         definite  matrix  A  using  the  Cholesky  factorization A =
         U**T*U or A = L*L**T computed by SPOTRF.
    
    
    ARGUMENTS
         UPLO      (input) CHARACTER*1
                   = 'U':  Upper triangle of A is stored;
                   = 'L':  Lower triangle of A is stored.
    
         N         (input) INTEGER
                   The order of the matrix A.  N >= 0.
    
         A         (input/output) REAL array, dimension (LDA,N)
                   On entry, the triangular factor U or  L  from  the
                   Cholesky  factorization  A = U**T*U or A = L*L**T,
                   as computed by SPOTRF.   On  exit,  the  upper  or
                   lower  triangle  of  the (symmetric) inverse of A,
                   overwriting the input factor U or L.
    
         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, the (i,i) element of the factor
                   U  or  L  is  zero,  and  the inverse could not be
                   computed.
    
    
    
    


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