cpotri man page on Scientific

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CPOTRI(1)		 LAPACK routine (version 3.2)		     CPOTRI(1)

NAME
       CPOTRI  - computes the inverse of a complex Hermitian positive definite
       matrix A using the Cholesky factorization A = U**H*U or A = L*L**H com‐
       puted by CPOTRF

SYNOPSIS
       SUBROUTINE CPOTRI( UPLO, N, A, LDA, INFO )

	   CHARACTER	  UPLO

	   INTEGER	  INFO, LDA, N

	   COMPLEX	  A( LDA, * )

PURPOSE
       CPOTRI  computes	 the  inverse of a complex Hermitian positive definite
       matrix A using the Cholesky factorization A = U**H*U or A = L*L**H com‐
       puted by CPOTRF.

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) COMPLEX array, dimension (LDA,N)
	       On  entry,  the triangular factor U or L from the Cholesky fac‐
	       torization A = U**H*U or A = L*L**H, as computed by CPOTRF.  On
	       exit, the upper or lower triangle of the (Hermitian) 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 routine (version 3.2)	 November 2008			     CPOTRI(1)
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