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- CCCCGGGGEEEEFFFFAAAA((((3333FFFF)))) CCCCGGGGEEEEFFFFAAAA((((3333FFFF))))
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- CGEFA - CGEFA factors a complex matrix by Gaussian elimination.
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- CGEFA is usually called by CGECO, but it can be called directly with a
- saving in time if RCOND is not needed. (Time for CGECO) = (1 +
- 9/N)*(Time for CGEFA) .
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- SUBROUTINE CGEFA(A,LDA,N,IPVT,INFO)
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- On Entry
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- AAAA COMPLEX(LDA, N)
- the matrix to be factored.
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- LLLLDDDDAAAA INTEGER
- the leading dimension of the array A .
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- NNNN INTEGER
- the order of the matrix A . On Return
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- AAAA an upper triangular matrix and the multipliers
- which were used to obtain it.
- The factorization can be written A = L*U where
- L is a product of permutation and unit lower
- triangular matrices and U is upper triangular.
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- IIIIPPPPVVVVTTTT INTEGER(N)
- an integer vector of pivot indices.
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- IIIINNNNFFFFOOOO INTEGER
- = 0 normal value.
- = K if U(K,K) .EQ. 0.0 . This is not an error
- condition for this subroutine, but it does
- indicate that CGESL or CGEDI will divide by zero
- if called. Use RCOND in CGECO for a reliable
- indication of singularity. LINPACK. This version dated 08/14/78 .
- Cleve Moler, University of New Mexico, Argonne National Lab. Subroutines
- and Functions BLAS CAXPY,CSCAL,ICAMAX Fortran ABS,AIMAG,REAL
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