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

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SPOTRI(l)					)					SPOTRI(l)

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, * )

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 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 				SPOTRI(l)
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