CGEDI(3F)CGEDI(3F)NAMECGEDI - CGEDI computes the determinant and inverse of a matrix using
the factors computed by CGECO or CGEFA.
SYNOPSYS
SUBROUTINE CGEDI(A,LDA,N,IPVT,DET,WORK,JOB)
DESCRIPTION
On Entry
A COMPLEX(LDA, N)
the output from CGECO or CGEFA.
LDA INTEGER
the leading dimension of the array A .
N INTEGER
the order of the matrix A .
IPVT INTEGER(N)
the pivot vector from CGECO or CGEFA.
WORK COMPLEX(N)
work vector. Contents destroyed.
JOB INTEGER
= 11 both determinant and inverse.
= 01 inverse only.
= 10 determinant only. On Return
A inverse of original matrix if requested.
Otherwise unchanged.
DET 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
A 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
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