DPOTRI(3F)							    DPOTRI(3F)

NAME    [Toc]    [Back]

     DPOTRI - 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
     DPOTRF

SYNOPSIS    [Toc]    [Back]

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

	 CHARACTER	UPLO

	 INTEGER	INFO, LDA, N

	 DOUBLE		PRECISION A( LDA, * )

PURPOSE    [Toc]    [Back]

     DPOTRI 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
     DPOTRF.

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) DOUBLE PRECISION 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 DPOTRF.
	     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.
DPOTRI(3F)							    DPOTRI(3F)

NAME    [Toc]    [Back]

     DPOTRI - 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
     DPOTRF

SYNOPSIS    [Toc]    [Back]

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

	 CHARACTER	UPLO

	 INTEGER	INFO, LDA, N

	 DOUBLE		PRECISION A( LDA, * )

PURPOSE    [Toc]    [Back]

     DPOTRI 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
     DPOTRF.

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) DOUBLE PRECISION 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 DPOTRF.
	     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.


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