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IRIX 6.2 Development Libraries
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SGBDI.z
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SGBDI
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1996-03-14
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2KB
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67 lines
SSSSGGGGBBBBDDDDIIII((((3333FFFF)))) SSSSGGGGBBBBDDDDIIII((((3333FFFF))))
NNNNAAAAMMMMEEEE
SGBDI - SGBDI computes the determinant of a band matrix using the
factors computed by SBGCO or SGBFA. If the inverse is needed, use SGBSL
N times.
SSSSYYYYNNNNOOOOPPPPSSSSYYYYSSSS
SUBROUTINE SGBDI(ABD,LDA,N,ML,MU,IPVT,DET)
DDDDEEEESSSSCCCCRRRRIIIIPPPPTTTTIIIIOOOONNNN
On Entry
AAAABBBBDDDD REAL(LDA, N)
the output from SBGCO or SGBFA.
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 SBGCO or SGBFA. On Return
DDDDEEEETTTT REAL(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 . LINPACK. This version dated 08/14/78 . Cleve
Moler, University of New Mexico, Argonne National Lab. Subroutines and
Functions Fortran ABS
PPPPaaaaggggeeee 1111