DNBDI(3)

SYNOPSIS
SUBROUTINE DNBDI (ABE, LDA, N, ML, MU, IPVT, DET)

NAME
dnbdi - Compute the determinant of a band matrix using the factors computed by DNBCO or DNBFA.

LIBRARY
SLATEC

CATEGORY
D3A2

TYPE
DOUBLE PRECISION (SNBDI-S, DNBDI-D, CNBDI-C)

KEYWORDS
BANDED, DETERMINANT, LINEAR EQUATIONS, NONSYMMETRIC

AUTHOR
Voorhees, E. A., (LANL)

DESCRIPTION
DNBDI computes the determinant of a band matrix using the factors computed by DNBCO or DNBFA. If the inverse is needed, use DNBSL N times. On Entry ABE DOUBLE PRECISION(LDA, NC) the output from DNBCO or DNBFA. NC must be .GE. 2*ML+MU+1 . LDA INTEGER the leading dimension of the array ABE . N INTEGER the order of the original matrix. ML INTEGER number of diagonals below the main diagonal. MU INTEGER number of diagonals above the main diagonal. IPVT INTEGER(N) the pivot vector from DNBCO or DNBFA. On Return DET DOUBLE PRECISION(2) determinant of original matrix. Determinant = DET(1) * 10.0**DET(2) with 1.0 .LE. ABS(DET(1)) .LT. 10.0 or DET(1) = 0.0 .

REFERENCES
J. J. Dongarra, J. R. Bunch, C. B. Moler, and G. W. Stewart, LINPACK Users' Guide, SIAM, 1979.

ROUTINES CALLED
(NONE)

REVISION HISTORY (YYMMDD)
800728 DATE WRITTEN
890531 Changed all specific intrinsics to generic. (WRB)
890831 Modified array declarations. (WRB)
890831 REVISION DATE from Version 3.2
891214 Prologue converted to Version 4.0 format. (BAB)
920501 Reformatted the REFERENCES section. (WRB)