debian man page for zgecon

zgecon.f(3)							      LAPACK							       zgecon.f(3)

NAME
       zgecon.f -

SYNOPSIS
   Functions/Subroutines
       subroutine zgecon (NORM, N, A, LDA, ANORM, RCOND, WORK, RWORK, INFO)
	   ZGECON

Function/Subroutine Documentation
   subroutine zgecon (characterNORM, integerN, complex*16, dimension( lda, * )A, integerLDA, double precisionANORM, double precisionRCOND,
       complex*16, dimension( * )WORK, double precision, dimension( * )RWORK, integerINFO)
       ZGECON

       Purpose:

	    ZGECON estimates the reciprocal of the condition number of a general
	    complex matrix A, in either the 1-norm or the infinity-norm, using
	    the LU factorization computed by ZGETRF.

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

       Parameters:
	   NORM

		     NORM is CHARACTER*1
		     Specifies whether the 1-norm condition number or the
		     infinity-norm condition number is required:
		     = '1' or 'O':  1-norm;
		     = 'I':	    Infinity-norm.

	   N

		     N is INTEGER
		     The order of the matrix A.  N >= 0.

	   A

		     A is COMPLEX*16 array, dimension (LDA,N)
		     The factors L and U from the factorization A = P*L*U
		     as computed by ZGETRF.

	   LDA

		     LDA is INTEGER
		     The leading dimension of the array A.  LDA >= max(1,N).

	   ANORM

		     ANORM is DOUBLE PRECISION
		     If NORM = '1' or 'O', the 1-norm of the original matrix A.
		     If NORM = 'I', the infinity-norm of the original matrix A.

	   RCOND

		     RCOND is DOUBLE PRECISION
		     The reciprocal of the condition number of the matrix A,
		     computed as RCOND = 1/(norm(A) * norm(inv(A))).

	   WORK

		     WORK is COMPLEX*16 array, dimension (2*N)

	   RWORK

		     RWORK is DOUBLE PRECISION array, dimension (2*N)

	   INFO

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

       Author:
	   Univ. of Tennessee

	   Univ. of California Berkeley

	   Univ. of Colorado Denver

	   NAG Ltd.

       Date:
	   November 2011

       Definition at line 124 of file zgecon.f.

Author
       Generated automatically by Doxygen for LAPACK from the source code.

Version 3.4.1							  Sun May 26 2013						       zgecon.f(3)