dpotri man page on OpenIndiana

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dpotri(3P)		    Sun Performance Library		    dpotri(3P)

NAME
       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 com‐
       puted by DPOTRF

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

       CHARACTER * 1 UPLO
       INTEGER N, LDA, INFO
       DOUBLE PRECISION A(LDA,*)

       SUBROUTINE DPOTRI_64(UPLO, N, A, LDA, INFO)

       CHARACTER * 1 UPLO
       INTEGER*8 N, LDA, INFO
       DOUBLE PRECISION A(LDA,*)

   F95 INTERFACE
       SUBROUTINE POTRI(UPLO, [N], A, [LDA], [INFO])

       CHARACTER(LEN=1) :: UPLO
       INTEGER :: N, LDA, INFO
       REAL(8), DIMENSION(:,:) :: A

       SUBROUTINE POTRI_64(UPLO, [N], A, [LDA], [INFO])

       CHARACTER(LEN=1) :: UPLO
       INTEGER(8) :: N, LDA, INFO
       REAL(8), DIMENSION(:,:) :: A

   C INTERFACE
       #include <sunperf.h>

       void dpotri(char uplo, int n, double *a, int lda, int *info);

       void dpotri_64(char uplo, long n, double *a, long lda, long *info);

PURPOSE
       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 com‐
       puted by DPOTRF.

ARGUMENTS
       UPLO (input)
		 = 'U':	 Upper triangle of A is stored;
		 = 'L':	 Lower triangle of A is stored.

       N (input) The order of the matrix A.  N >= 0.

       A (input/output)
		 On entry, the triangular factor U or L from the Cholesky fac‐
		 torization 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)
		 The leading dimension of the array A.	LDA >= max(1,N).

       INFO (output)
		 = 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.

				  6 Mar 2009			    dpotri(3P)
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