ilu_zpivotL.c File Reference

Performs numerical pivoting. More...

#include <math.h>
#include <stdlib.h>
#include "slu_zdefs.h"

Include dependency graph for ilu_zpivotL.c:

Macros
#define	SGN(x)   ((x)>=0?1:-1)

Functions
int	ilu_zpivotL (const int jcol, const double u, int *usepr, int *perm_r, int diagind, int *swap, int *iswap, int *marker, int *pivrow, double fill_tol, milu_t milu, doublecomplex drop_sum, GlobalLU_t *Glu, SuperLUStat_t *stat)

Detailed Description

Copyright (c) 2003, The Regents of the University of California, through Lawrence Berkeley National Laboratory (subject to receipt of any required approvals from U.S. Dept. of Energy)

All rights reserved.

The source code is distributed under BSD license, see the file License.txt at the top-level directory.

– SuperLU routine (version 4.0) –
Lawrence Berkeley National Laboratory
June 30, 2009

Macro Definition Documentation

#define SGN

(

x

)

((x)>=0?1:-1)

Function Documentation

int ilu_zpivotL	(	const int	jcol,
		const double	u,
		int *	usepr,
		int *	perm_r,
		int	diagind,
		int *	swap,
		int *	iswap,
		int *	marker,
		int *	pivrow,
		double	fill_tol,
		milu_t	milu,
		doublecomplex	drop_sum,
		GlobalLU_t *	Glu,
		SuperLUStat_t *	stat
	)

Purpose

  Performs the numerical pivoting on the current column of L,
  and the CDIV operation.

  Pivot policy:
  (1) Compute thresh = u * max_(i>=j) abs(A_ij);
  (2) IF user specifies pivot row k and abs(A_kj) >= thresh THEN
          pivot row = k;
      ELSE IF abs(A_jj) >= thresh THEN
          pivot row = j;
      ELSE
          pivot row = m;

  Note: If you absolutely want to use a given pivot order, then set u=0.0.

  Return value: 0         success;
           i > 0  U(i,i) is exactly zero.

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