cgbdi
cgbdi - (obsolete) compute the determinant of a general matrix A in banded storage, which has been LU-factored by CGBCO or CGBFA.
SUBROUTINE CGBDI( A, LDA, N, NSUB, NSUPER, IPIVOT, DET)
COMPLEX A(LDA,*), DET(*)
INTEGER LDA, N, NSUB, NSUPER
INTEGER IPIVOT(*)
SUBROUTINE CGBDI_64( A, LDA, N, NSUB, NSUPER, IPIVOT, DET)
COMPLEX A(LDA,*), DET(*)
INTEGER*8 LDA, N, NSUB, NSUPER
INTEGER*8 IPIVOT(*)
#include <sunperf.h>
void cgbdi(complex *a, int lda, int n, int nsub, int nsuper, int *ipivot, complex *det);
void cgbdi_64(complex *a, long lda, long n, long nsub, long nsuper, long *ipivot, complex *det);
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* A (input)
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LU factorization of the matrix A, as computed by CGBCO or CGBFA.
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* LDA (input)
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Leading dimension of the array A as specified in a dimension or type statement. LDA >= 2 * NSUB + NSUPER + 1.
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* N (input)
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Order of the original matrix A. N >= 0.
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* NSUB (input)
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Number of subdiagonals of A. N-1 >= NSUB >= 0 but if N = 0 then NSUB = 0.
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* NSUPER (input)
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Number of superdiagonals of A. N-1 >= NSUPER >= 0 but if N = 0 then NSUPER = 0.
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* IPIVOT (input)
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Pivot vector as computed by CGBCO or CGBFA.
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* DET (output)
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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.