PreAMGCoarsenRS.c File Reference

Coarsening with a modified Ruge-Stuben strategy. More...

#include "fasp.h"
#include "fasp_functs.h"
#include "PreAMGUtil.inl"
#include <math.h>

Go to the source code of this file.

Functions
SHORT	fasp_amg_coarsening_rs (dCSRmat *A, ivector *vertices, dCSRmat *P, iCSRmat *S, AMG_param *param)
	Standard and aggressive coarsening schemes. More...
REAL	rabs (REAL x)

Detailed Description

Coarsening with a modified Ruge-Stuben strategy.

Note

This file contains Level-4 (Pre) functions. It requires: AuxArray.c, AuxMemory.c, AuxMessage.c, AuxThreads.c, AuxVector.c, BlaSparseCSR.c, and PreAMGCoarsenCR.c

Reference: Multigrid by U. Trottenberg, C. W. Oosterlee and A. Schuller Appendix P475 A.7 (by A. Brandt, P. Oswald and K. Stuben) Academic Press Inc., San Diego, CA, 2001.

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Copyright (C) 2009–Present by the FASP team. All rights reserved.

Released under the terms of the GNU Lesser General Public License 3.0 or later.

Definition in file PreAMGCoarsenRS.c.

Function Documentation

fasp_amg_coarsening_rs()

SHORT fasp_amg_coarsening_rs	(	dCSRmat *	A,
		ivector *	vertices,
		dCSRmat *	P,
		iCSRmat *	S,
		AMG_param *	param
	)

Standard and aggressive coarsening schemes.

Parameters

A	Pointer to dCSRmat: Coefficient matrix (index starts from 0)
vertices	Indicator vector for the C/F splitting of the variables
P	Interpolation matrix (nonzero pattern only)
S	Strong connection matrix
param	Pointer to AMG_param: AMG parameters

Returns

FASP_SUCCESS if successed; otherwise, error information.

Author

Xuehai Huang, Chensong Zhang, Xiaozhe Hu, Ludmil Zikatanov

Date

09/06/2010

Note

vertices = 0: fine; 1: coarse; 2: isolated or special

Modified by Xiaozhe Hu on 05/23/2011: add strength matrix as an argument Modified by Xiaozhe Hu on 04/24/2013: modify aggressive coarsening Modified by Chensong Zhang on 04/28/2013: remove linked list Modified by Chensong Zhang on 05/11/2013: restructure the code

Definition at line 76 of file PreAMGCoarsenRS.c.

rabs()

REAL rabs

(

REAL

x

)

Definition at line 1783 of file PreAMGCoarsenRS.c.