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<meta content="text/html;charset=UTF-8" http-equiv="Content-Type">
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<title>SuperLU: SRC/slaqgs.c File Reference</title>
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<link href="doxygen.css" rel="stylesheet" type="text/css">
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<link href="tabs.css" rel="stylesheet" type="text/css">
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Main Page
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Data Structures
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Files
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SRC/slaqgs.c File ReferenceEqulibrates a general sprase matrix. More...
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#include <math.h>
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#include "slu_sdefs.h"
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Defines
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#define THRESH (0.1)
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Functions
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void slaqgs (SuperMatrix *A, float *r, float *c, float rowcnd, float colcnd, float amax, char *equed)
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Detailed Description
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-- SuperLU routine (version 2.0) --
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Univ. of California Berkeley, Xerox Palo Alto Research Center,
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and Lawrence Berkeley National Lab.
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November 15, 1997
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Modified from LAPACK routine SLAQGE
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Define Documentation
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#define THRESH (0.1)
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Function Documentation
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void slaqgs
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(
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SuperMatrix *
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A,
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float *
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r,
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float *
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c,
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float
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rowcnd,
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float
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colcnd,
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float
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amax,
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char *
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equed
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)
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Purpose
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=======
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SLAQGS equilibrates a general sparse M by N matrix A using the row and
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scaling factors in the vectors R and C.
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See supermatrix.h for the definition of 'SuperMatrix' structure.
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Arguments
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=========
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A (input/output) SuperMatrix*
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On exit, the equilibrated matrix. See EQUED for the form of
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the equilibrated matrix. The type of A can be:
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Stype = NC; Dtype = SLU_S; Mtype = GE.
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R (input) float*, dimension (A->nrow)
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The row scale factors for A.
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C (input) float*, dimension (A->ncol)
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The column scale factors for A.
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ROWCND (input) float
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Ratio of the smallest R(i) to the largest R(i).
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COLCND (input) float
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Ratio of the smallest C(i) to the largest C(i).
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AMAX (input) float
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Absolute value of largest matrix entry.
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EQUED (output) char*
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Specifies the form of equilibration that was done.
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= 'N': No equilibration
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= 'R': Row equilibration, i.e., A has been premultiplied by
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diag(R).
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= 'C': Column equilibration, i.e., A has been postmultiplied
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by diag(C).
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= 'B': Both row and column equilibration, i.e., A has been
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replaced by diag(R) * A * diag(C).
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Internal Parameters
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===================
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THRESH is a threshold value used to decide if row or column scaling
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should be done based on the ratio of the row or column scaling
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factors. If ROWCND < THRESH, row scaling is done, and if
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COLCND < THRESH, column scaling is done.
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LARGE and SMALL are threshold values used to decide if row scaling
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should be done based on the absolute size of the largest matrix
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element. If AMAX > LARGE or AMAX < SMALL, row scaling is done.
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=====================================================================
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<address style="text-align: right;"><small>Generated on Mon Nov 22 10:23:48 2010 for SuperLU by </small></address>
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 1.5.5
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