ZPOTRI(3F)							    ZPOTRI(3F)

NAME    [Toc]    [Back]

     ZPOTRI - compute the inverse of a complex Hermitian positive definite
     matrix A using the	Cholesky factorization A = U**H*U or A = L*L**H
     computed by ZPOTRF

SYNOPSIS    [Toc]    [Back]

     SUBROUTINE	ZPOTRI(	UPLO, N, A, LDA, INFO )

	 CHARACTER	UPLO

	 INTEGER	INFO, LDA, N

	 COMPLEX*16	A( LDA,	* )

PURPOSE    [Toc]    [Back]

     ZPOTRI computes the inverse of a complex Hermitian	positive definite
     matrix A using the	Cholesky factorization A = U**H*U or A = L*L**H
     computed by ZPOTRF.

ARGUMENTS    [Toc]    [Back]

     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*16 array, dimension	(LDA,N)
	     On	entry, the triangular factor U or L from the Cholesky
	     factorization A = U**H*U or A = L*L**H, as	computed by ZPOTRF.
	     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.
ZPOTRI(3F)							    ZPOTRI(3F)

NAME    [Toc]    [Back]

     ZPOTRI - compute the inverse of a complex Hermitian positive definite
     matrix A using the	Cholesky factorization A = U**H*U or A = L*L**H
     computed by ZPOTRF

SYNOPSIS    [Toc]    [Back]

     SUBROUTINE	ZPOTRI(	UPLO, N, A, LDA, INFO )

	 CHARACTER	UPLO

	 INTEGER	INFO, LDA, N

	 COMPLEX*16	A( LDA,	* )

PURPOSE    [Toc]    [Back]

     ZPOTRI computes the inverse of a complex Hermitian	positive definite
     matrix A using the	Cholesky factorization A = U**H*U or A = L*L**H
     computed by ZPOTRF.

ARGUMENTS    [Toc]    [Back]

     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*16 array, dimension	(LDA,N)
	     On	entry, the triangular factor U or L from the Cholesky
	     factorization A = U**H*U or A = L*L**H, as	computed by ZPOTRF.
	     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.


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