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IRIX 6.2 Development Libraries
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DGEDI.z
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DGEDI
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1996-03-14
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2KB
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67 lines
DDDDGGGGEEEEDDDDIIII((((3333FFFF)))) DDDDGGGGEEEEDDDDIIII((((3333FFFF))))
NNNNAAAAMMMMEEEE
DGEDI - DGEDI computes the determinant and inverse of a matrix using
the factors computed by DGECO or DGEFA.
SSSSYYYYNNNNOOOOPPPPSSSSYYYYSSSS
SUBROUTINE DGEDI(A,LDA,N,IPVT,DET,WORK,JOB)
DDDDEEEESSSSCCCCRRRRIIIIPPPPTTTTIIIIOOOONNNN
On Entry
AAAA DOUBLE PRECISION(LDA, N)
the output from DGECO or DGEFA.
LLLLDDDDAAAA INTEGER
the leading dimension of the array A .
NNNN INTEGER
the order of the matrix A .
IIIIPPPPVVVVTTTT INTEGER(N)
the pivot vector from DGECO or DGEFA.
WWWWOOOORRRRKKKK DOUBLE PRECISION(N)
work vector. Contents destroyed.
JJJJOOOOBBBB INTEGER
= 11 both determinant and inverse.
= 01 inverse only.
= 10 determinant only. On Return
AAAA inverse of original matrix if requested.
Otherwise unchanged.
DDDDEEEETTTT DOUBLE PRECISION(2)
determinant of original matrix if requested.
Otherwise not referenced.
Determinant = DET(1) * 10.0**DET(2)
with 1.0 .LE. DABS(DET(1)) .LT. 10.0
or DET(1) .EQ. 0.0 . Error Condition
AAAA division by zero will occur if the input factor contains a zero on the
diagonal and the inverse is requested. It will not occur if the
subroutines are called correctly and if DGECO has set RCOND .GT. 0.0 or
DGEFA has set INFO .EQ. 0 . LINPACK. This version dated 08/14/78 .
Cleve Moler, University of New Mexico, Argonne National Lab. Subroutines
and Functions BLAS DAXPY,DSCAL,DSWAP Fortran DABS,MOD
PPPPaaaaggggeeee 1111