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IRIX 6.2 Development Libraries
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CPOFA.z
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CPOFA
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1996-03-14
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67 lines
CCCCPPPPOOOOFFFFAAAA((((3333FFFF)))) CCCCPPPPOOOOFFFFAAAA((((3333FFFF))))
NNNNAAAAMMMMEEEE
CPOFA - CPOFA factors a complex Hermitian positive definite matrix.
CPOFA is usually called by CPOCO, but it can be called directly with a
saving in time if RCOND is not needed. (Time for CPOCO) = (1 +
18/N)*(Time for CPOFA) .
SSSSYYYYNNNNOOOOPPPPSSSSYYYYSSSS
SUBROUTINE CPOFA(A,LDA,N,INFO)
DDDDEEEESSSSCCCCRRRRIIIIPPPPTTTTIIIIOOOONNNN
On Entry
AAAA COMPLEX(LDA, N)
the Hermitian matrix to be factored. Only the
diagonal and upper triangle are used.
LLLLDDDDAAAA INTEGER
the leading dimension of the array A .
NNNN INTEGER
the order of the matrix A . On Return
AAAA an upper triangular matrix R so that A =
CTRANS(R)*R where CTRANS(R) is the conjugate
transpose. The strict lower triangle is unaltered.
If INFO .NE. 0 , the factorization is not complete.
IIIINNNNFFFFOOOO INTEGER
= 0 for normal return.
= K signals an error condition. The leading minor
of order K is not positive definite. LINPACK. This version dated
08/14/78 . Cleve Moler, University of New Mexico, Argonne National Lab.
Subroutines and Functions BLAS CDOTC Fortran AIMAG,CMPLX,CONJG,REAL,SQRT
PPPPaaaaggggeeee 1111