dpotri

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 computed by SPOTRF

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 computed by SPOTRF.

ARGUMENTS

* UPLO (input)
* N (input): The order of the matrix A. N >= 0.
* A (input/output): 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): The leading dimension of the array A. LDA >= max(1,N).
* INFO (output)