cppcon man page on IRIX

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CPPCON(3F)							    CPPCON(3F)

NAME
     CPPCON - estimate the reciprocal of the condition number (in the 1-norm)
     of a complex Hermitian positive definite packed matrix using the Cholesky
     factorization A = U**H*U or A = L*L**H computed by CPPTRF

SYNOPSIS
     SUBROUTINE CPPCON( UPLO, N, AP, ANORM, RCOND, WORK, RWORK, INFO )

	 CHARACTER	UPLO

	 INTEGER	INFO, N

	 REAL		ANORM, RCOND

	 REAL		RWORK( * )

	 COMPLEX	AP( * ), WORK( * )

PURPOSE
     CPPCON estimates the reciprocal of the condition number (in the 1-norm)
     of a complex Hermitian positive definite packed matrix using the Cholesky
     factorization A = U**H*U or A = L*L**H computed by CPPTRF.

     An estimate is obtained for norm(inv(A)), and the reciprocal of the
     condition number is computed as RCOND = 1 / (ANORM * norm(inv(A))).

ARGUMENTS
     UPLO    (input) CHARACTER*1
	     = 'U':  Upper triangle of A is stored;
	     = 'L':  Lower triangle of A is stored.

     N	     (input) INTEGER
	     The order of the matrix A.	 N >= 0.

     AP	     (input) COMPLEX array, dimension (N*(N+1)/2)
	     The triangular factor U or L from the Cholesky factorization A =
	     U**H*U or A = L*L**H, packed columnwise in a linear array.	 The
	     j-th column of U or L is stored in the array AP as follows:  if
	     UPLO = 'U', AP(i + (j-1)*j/2) = U(i,j) for 1<=i<=j; if UPLO =
	     'L', AP(i + (j-1)*(2n-j)/2) = L(i,j) for j<=i<=n.

     ANORM   (input) REAL
	     The 1-norm (or infinity-norm) of the Hermitian matrix A.

     RCOND   (output) REAL
	     The reciprocal of the condition number of the matrix A, computed
	     as RCOND = 1/(ANORM * AINVNM), where AINVNM is an estimate of the
	     1-norm of inv(A) computed in this routine.

									Page 1

CPPCON(3F)							    CPPCON(3F)

     WORK    (workspace) COMPLEX array, dimension (2*N)

     RWORK   (workspace) REAL array, dimension (N)

     INFO    (output) INTEGER
	     = 0:  successful exit
	     < 0:  if INFO = -i, the i-th argument had an illegal value

									Page 2

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