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dpptri (3)
  • >> dpptri (3) ( Solaris man: Библиотечные вызовы )
  • 
    NAME
         dpptri - 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 DPPTRF
    
    SYNOPSIS
         SUBROUTINE DPPTRI( UPLO, N, AP, INFO )
    
         CHARACTER UPLO
    
         INTEGER INFO, N
    
         DOUBLE PRECISION AP( * )
    
    
    
         #include <sunperf.h>
    
         void dpptri(char uplo, int n, double *dap, int *info);
    
    PURPOSE
         DPPTRI 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 DPPTRF.
    
    
    ARGUMENTS
         UPLO      (input) CHARACTER*1
                   = 'U':  Upper triangular factor is stored in AP;
                   = 'L':  Lower triangular factor is stored in AP.
    
         N         (input) INTEGER
                   The order of the matrix A.  N >= 0.
    
         AP        (input/output) DOUBLE PRECISION  array,  dimension
                   (N*(N+1)/2)
                   On entry, the triangular factor U or  L  from  the
                   Cholesky  factorization  A = U**T*U or A = L*L**T,
                   packed columnwise as a  linear  array.   The  j-th
                   column of U or L is stored in the array AP as fol-
                   lows:  if UPLO = 'U', AP(i + (j-1)*j/2)  =  U(i,j)
                   for 1<=i<=j; if UPLO = 'L', AP(i + (j-1)*(2n-j)/2)
                   = L(i,j) for j<=i<=n.
    
                   On exit, the upper or lower triangle of the  (sym-
                   metric) inverse of A, overwriting the input factor
                   U or L.
    
         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 com-
                   puted.
    
    
    
    


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