CSIDI(3F)							     CSIDI(3F)

NAME    [Toc]    [Back]

     CSIDI   - CSIDI computes the determinant and inverse of a complex
     symmetric matrix using the	factors	from CSIFA.

SYNOPSYS    [Toc]    [Back]

      SUBROUTINE CSIDI(A,LDA,N,KPVT,DET,WORK,JOB)

DESCRIPTION    [Toc]    [Back]

     On	Entry

     A COMPLEX(LDA,N)
	the output from	CSIFA.

     LDA INTEGER
	the leading dimension of the array A .

     N INTEGER
	the order of the matrix	A .  KVPT    INTEGER(N)
	the pivot vector from CSIFA.

     WORK COMPLEX(N)
	work vector.  Contents destroyed.

     JOB INTEGER
	JOB has	the decimal expansion  AB  where
	If  B .NE. 0, the inverse is computed,
	If  A .NE. 0, the determinant is computed,
	For example, JOB = 11  gives both.  On Return Variables	not requested
     by	JOB are	not used.

     A contains	the upper triangle of the inverse of
	the original matrix.  The strict lower triangle
	is never referenced.

     DET COMPLEX(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.  Error	Condition

     A division	by zero	may occur if the inverse is requested and  CSICO  has
     set RCOND .EQ. 0.0	or  CSIFA  has set  INFO .NE. 0	.  LINPACK.  This
     version dated 08/14/78 .  James Bunch, Univ. Calif. San Diego, Argonne
     Nat. Lab.	Subroutines and	Functions BLAS CAXPY,CCOPY,CDOTU,CSWAP Fortran
     ABS,CMPLX,IABS,MOD,REAL


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