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chetri (3)
  • >> chetri (3) ( Solaris man: Библиотечные вызовы )
  • 
    NAME
         chetri - compute the inverse of a complex Hermitian indefin-
         ite  matrix  A  using  the factorization A = U*D*U**H or A =
         L*D*L**H computed by CHETRF
    
    SYNOPSIS
         SUBROUTINE CHETRI( UPLO, N, A, LDA, IPIV, WORK, INFO )
    
         CHARACTER UPLO
    
         INTEGER INFO, LDA, N
    
         INTEGER IPIV( * )
    
         COMPLEX A( LDA, * ), WORK( * )
    
    
    
         #include <sunperf.h>
    
         void chetri(char uplo, int n,  complex  *ca,  int  lda,  int
                   *ipivot, int *info) ;
    
    PURPOSE
         CHETRI computes the inverse of a complex Hermitian  indefin-
         ite  matrix  A  using  the factorization A = U*D*U**H or A =
         L*D*L**H computed by CHETRF.
    
    
    ARGUMENTS
         UPLO      (input) CHARACTER*1
                   Specifies whether the details of the factorization
                   are stored as an upper or lower triangular matrix.
                   = 'U':  Upper triangular, form is A = U*D*U**H;
                   = 'L':  Lower triangular, form is A = L*D*L**H.
    
         N         (input) INTEGER
                   The order of the matrix A.  N >= 0.
    
         A         (input/output) COMPLEX array, dimension (LDA,N)
                   On entry, the block diagonal matrix D and the mul-
                   tipliers  used to obtain the factor U or L as com-
                   puted by CHETRF.
    
                   On exit, if INFO = 0, the (Hermitian)  inverse  of
                   the  original  matrix.   If  UPLO = 'U', the upper
                   triangular part of the inverse is formed  and  the
                   part of A below the diagonal is not referenced; if
                   UPLO =  'L'  the  lower  triangular  part  of  the
                   inverse  is  formed  and  the  part of A above the
                   diagonal is not referenced.
    
         LDA       (input) INTEGER
                   The leading dimension of  the  array  A.   LDA  >=
                   max(1,N).
    
         IPIV      (input) INTEGER array, dimension (N)
                   Details of the interchanges and the  block  struc-
                   ture of D as determined by CHETRF.
    
         WORK      (workspace) COMPLEX array, dimension (N)
    
         INFO      (output) INTEGER
                   = 0: successful exit
                   < 0: if INFO = -i, the i-th argument had an  ille-
                   gal value
                   > 0: if INFO = i, D(i,i) = 0; the matrix is singu-
                   lar and its inverse could not be computed.
    
    
    
    


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