dpodi

NAME

dpodi - (obsolete) compute the determinant and inverse of a symmetric positive definite matrix A, which has been Cholesky-factored by SPOCO, SPOFA, or SQRDC.

SYNOPSIS 

  SUBROUTINE DPODI( A, LDA, N, DET, JOB)
  INTEGER LDA, N, JOB
  DOUBLE PRECISION A(LDA,*), DET(*)
 
  SUBROUTINE DPODI_64( A, LDA, N, DET, JOB)
  INTEGER*8 LDA, N, JOB
  DOUBLE PRECISION A(LDA,*), DET(*)

C INTERFACE

#include <sunperf.h>

void dpodi(double *a, int lda, int n, double *det, int job);

void dpodi_64(double *a, long lda, long n, double *det, long job);

ARGUMENTS

* A (input/output)
On entry, the Cholesky factorization of the matrix A, as computed by SPOCO, SPOFA, or SQRDC. On exit, the inverse of the original matrix A if the inverse was requested, otherwise A is unchanged. The strict lower triangle of A is not referenced.

* LDA (input)
Leading dimension of the array A as specified in a dimension or type statement. LDA >= max(1,N).

* N (input)
Order of the original matrix A. N >= 0.

* DET (output)
On exit, the determinant of the matrix A. The determinant is stored as b * (10 ** expon) where b is stored in DET(1) and expon is stored in DET(2). 1.0 <= |DET(1)| <= 10.0 or DET(1) = 0.0.

* JOB (input)
Determines which operation the subroutine will perform: