dppdi
dppdi - (obsolete) compute the determinant and inverse of a symmetric positive definite
matrix A in packed storage, which has been Cholesky-factored by SPPCO or SPPFA.
SUBROUTINE DPPDI( A, N, DET, JOB)
INTEGER N, JOB
DOUBLE PRECISION A(*), DET(*)
SUBROUTINE DPPDI_64( A, N, DET, JOB)
INTEGER*8 N, JOB
DOUBLE PRECISION A(*), DET(*)
#include <sunperf.h>
void dppdi(double *a, int n, double *det, int job);
void dppdi_64(double *a, long n, double *det, long job);
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* A (input/output)
-
On entry, the Cholesky factorization of the matrix A, as
computed by SPPCO or SPPFA. 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.
-
* 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.
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* JOB (input)
-
Determines which operation the subroutine will perform:
- 11 both determinant and inverse