cgecon man page on YellowDog

Man page or keyword search:  
man Server   18644 pages
apropos Keyword Search (all sections)
Output format
YellowDog logo
[printable version]

CGECON(l)			       )			     CGECON(l)

NAME
       CGECON  -  estimate 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 CGETRF

SYNOPSIS
       SUBROUTINE CGECON( NORM, N, A, LDA, ANORM, RCOND, WORK, RWORK, INFO )

	   CHARACTER	  NORM

	   INTEGER	  INFO, LDA, N

	   REAL		  ANORM, RCOND

	   REAL		  RWORK( * )

	   COMPLEX	  A( LDA, * ), WORK( * )

PURPOSE
       CGECON  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	CGETRF.	  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)) ).

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

       A       (input) COMPLEX array, dimension (LDA,N)
	       The  factors  L	and U from the factorization A = P*L*U as com‐
	       puted by CGETRF.

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

       ANORM   (input) REAL
	       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   (output) REAL
	       The  reciprocal	of  the condition number of the matrix A, com‐
	       puted as RCOND = 1/(norm(A) * norm(inv(A))).

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

       RWORK   (workspace) REAL array, dimension (2*N)

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

LAPACK version 3.0		 15 June 2000			     CGECON(l)
[top]

List of man pages available for YellowDog

Copyright (c) for man pages and the logo by the respective OS vendor.

For those who want to learn more, the polarhome community provides shell access and support.

[legal] [privacy] [GNU] [policy] [cookies] [netiquette] [sponsors] [FAQ]
Tweet
Polarhome, production since 1999.
Member of Polarhome portal.
Based on Fawad Halim's script.
....................................................................
Vote for polarhome
Free Shell Accounts :: the biggest list on the net