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- CSPDI - CSPDI computes the determinant and inverse of a complex
- symmetric matrix using the factors from CSPFA, where the matrix is stored
- in packed form.
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- SUBROUTINE CSPDI(AP,N,KPVT,DET,WORK,JOB)
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- On Entry
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- AAAAPPPP COMPLEX (N*(N+1)/2)
- the output from CSPFA.
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- NNNN INTEGER
- the order of the matrix A . KVPT INTEGER(N)
- the pivot vector from CSPFA.
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- WWWWOOOORRRRKKKK COMPLEX(N)
- work vector. Contents ignored.
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- JJJJOOOOBBBB 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.
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- AAAAPPPP contains the upper triangle of the inverse of
- the original matrix, stored in packed form.
- The columns of the upper triangle are stored
- sequentially in a one-dimensional array.
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- DDDDEEEETTTT 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
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- AAAA division by zero will occur if the inverse is requested and CSPCO has
- set RCOND .EQ. 0.0 or CSPFA 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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