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IRIX 6.2 Development Libraries
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CGEDI.z
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CGEDI
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1996-03-14
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2KB
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67 lines
CCCCGGGGEEEEDDDDIIII((((3333FFFF)))) CCCCGGGGEEEEDDDDIIII((((3333FFFF))))
NNNNAAAAMMMMEEEE
CGEDI - CGEDI computes the determinant and inverse of a matrix using
the factors computed by CGECO or CGEFA.
SSSSYYYYNNNNOOOOPPPPSSSSYYYYSSSS
SUBROUTINE CGEDI(A,LDA,N,IPVT,DET,WORK,JOB)
DDDDEEEESSSSCCCCRRRRIIIIPPPPTTTTIIIIOOOONNNN
On Entry
AAAA COMPLEX(LDA, N)
the output from CGECO or CGEFA.
LLLLDDDDAAAA INTEGER
the leading dimension of the array A .
NNNN INTEGER
the order of the matrix A .
IIIIPPPPVVVVTTTT INTEGER(N)
the pivot vector from CGECO or CGEFA.
WWWWOOOORRRRKKKK COMPLEX(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 COMPLEX(2)
determinant of original matrix if requested.
Otherwise not referenced.
Determinant = DET(1) * 10.0**DET(2)
with 1.0 .LE. CABS1(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 CGECO has set RCOND .GT. 0.0 or
CGEFA 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 CAXPY,CSCAL,CSWAP Fortran ABS,AIMAG,CMPLX,MOD,REAL
PPPPaaaaggggeeee 1111