CPOFA(3F)CPOFA(3F)NAMECPOFA - 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) .
SYNOPSYS
SUBROUTINE CPOFA(A,LDA,N,INFO)
DESCRIPTION
On Entry
A COMPLEX(LDA, N)
the Hermitian matrix to be factored. Only the
diagonal and upper triangle are used.
LDA INTEGER
the leading dimension of the array A .
N INTEGER
the order of the matrix A . On Return
A 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.
INFO 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
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