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RedHat 9 (Linux i386) - man page for spptri (redhat section l)

SPPTRI(l)					)					SPPTRI(l)

NAME
       SPPTRI  -  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 SPPTRF

SYNOPSIS
       SUBROUTINE SPPTRI( UPLO, N, AP, INFO )

	   CHARACTER	  UPLO

	   INTEGER	  INFO, N

	   REAL 	  AP( * )

PURPOSE
       SPPTRI 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 SPPTRF.

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) REAL 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 follows: 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 (symmetric) 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 illegal value
	       > 0:  if INFO = i, the (i,i) element of the factor U or L is zero, and the inverse
	       could not be computed.

LAPACK version 3.0			   15 June 2000 				SPPTRI(l)


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