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IRIX 6.2 Development Libraries
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DGBDI.z
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DGBDI
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1996-03-14
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2KB
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67 lines
DDDDGGGGBBBBDDDDIIII((((3333FFFF)))) DDDDGGGGBBBBDDDDIIII((((3333FFFF))))
NNNNAAAAMMMMEEEE
DGBDI - DGBDI computes the determinant of a band matrix using the
factors computed by DGBCO or DGBFA. If the inverse is needed, use DGBSL
N times.
SSSSYYYYNNNNOOOOPPPPSSSSYYYYSSSS
SUBROUTINE DGBDI(ABD,LDA,N,ML,MU,IPVT,DET)
DDDDEEEESSSSCCCCRRRRIIIIPPPPTTTTIIIIOOOONNNN
On Entry
AAAABBBBDDDD DOUBLE PRECISION(LDA, N)
the output from DGBCO or DGBFA.
LLLLDDDDAAAA INTEGER
the leading dimension of the array ABD .
NNNN INTEGER
the order of the original matrix.
MMMMLLLL INTEGER
number of diagonals below the main diagonal.
MMMMUUUU INTEGER
number of diagonals above the main diagonal.
IIIIPPPPVVVVTTTT INTEGER(N)
the pivot vector from DGBCO or DGBFA. On Return
DDDDEEEETTTT DOUBLE PRECISION(2)
determinant of original matrix.
Determinant = DET(1) * 10.0**DET(2)
with 1.0 .LE. DABS(DET(1)) .LT. 10.0
or DET(1) = 0.0 . LINPACK. This version dated 08/14/78 . Cleve
Moler, University of New Mexico, Argonne National Lab. Subroutines and
Functions Fortran DABS
PPPPaaaaggggeeee 1111