spbdi

NAME

spbdi - (obsolete) compute the determinant of a symmetric positive definite matrix A in banded storage, which has been Cholesky-factored by SPBCO or SPBFA.

SYNOPSIS

  SUBROUTINE SPBDI( A, LDA, N, NDIAG, DET)
  INTEGER LDA, N, NDIAG
  REAL A(LDA,*), DET(*)
 
  SUBROUTINE SPBDI_64( A, LDA, N, NDIAG, DET)
  INTEGER*8 LDA, N, NDIAG
  REAL A(LDA,*), DET(*)

C INTERFACE

#include <sunperf.h>

void spbdi(float *a, int lda, int n, int ndiag, float *det);

void spbdi_64(float *a, long lda, long n, long ndiag, float *det);

ARGUMENTS

* A (input): Cholesky factorization of the matrix A, as computed by SPBCO or SPBFA.
* LDA (input): Leading dimension of the array A as specified in a dimension or type statement. LDA >= NDIAG + 1.
* N (input): Order of the original matrix A. N >= 0.
* NDIAG (input): Number of diagonals. N-1 >= NDIAG >= 0 but if N = 0 then NDIAG = 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.