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IRIX 6.2 Development Libraries
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SGEDI.z
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SGEDI
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1996-03-14
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2KB
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67 lines
SSSSGGGGEEEEDDDDIIII((((3333FFFF)))) SSSSGGGGEEEEDDDDIIII((((3333FFFF))))
NNNNAAAAMMMMEEEE
SGEDI - SGEDI computes the determinant and inverse of a matrix using
the factors computed by SGECO or SGEFA.
SSSSYYYYNNNNOOOOPPPPSSSSYYYYSSSS
SUBROUTINE SGEDI(A,LDA,N,IPVT,DET,WORK,JOB)
DDDDEEEESSSSCCCCRRRRIIIIPPPPTTTTIIIIOOOONNNN
On Entry
AAAA REAL(LDA, N)
the output from SGECO or SGEFA.
LLLLDDDDAAAA INTEGER
the leading dimension of the array A .
NNNN INTEGER
the order of the matrix A .
IIIIPPPPVVVVTTTT INTEGER(N)
the pivot vector from SGECO or SGEFA.
WWWWOOOORRRRKKKK REAL(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 REAL(2)
determinant of original matrix if requested.
Otherwise not referenced.
Determinant = DET(1) * 10.0**DET(2)
with 1.0 .LE. ABS(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 SGECO has set RCOND .GT. 0.0 or
SGEFA 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 SAXPY,SSCAL,SSWAP Fortran ABS,MOD
PPPPaaaaggggeeee 1111