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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><meta http-equiv="Content-Type" content="text/html;charset=iso-8859-1"><title>SuperLU: SRC/slaqgs.c File Reference</title><link href="doxygen.css" rel="stylesheet" type="text/css"><link href="tabs.css" rel="stylesheet" type="text/css"></head><body><!-- Generated by Doxygen 1.4.6 --><div class="tabs"> <ul> <li><a href="index.html"><span>Main Page</span></a></li> <li><a href="annotated.html"><span>Data Structures</span></a></li> <li id="current"><a href="files.html"><span>Files</span></a></li> </ul></div><div class="tabs"> <ul> <li><a href="files.html"><span>File List</span></a></li> <li><a href="globals.html"><span>Globals</span></a></li> </ul></div><h1>SRC/slaqgs.c File Reference</h1>Equlibrates a general sprase matrix. <a href="#_details">More...</a><p><code>#include <math.h></code><br><code>#include "<a class="el" href="slu__sdefs_8h-source.html">slu_sdefs.h</a>"</code><br><table border="0" cellpadding="0" cellspacing="0"><tr><td></td></tr><tr><td colspan="2"><br><h2>Defines</h2></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="slaqgs_8c.html#0656018abfc9fa2821827415f5d5ea57">THRESH</a> (0.1)</td></tr><tr><td colspan="2"><br><h2>Functions</h2></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="slaqgs_8c.html#f44216962efdebc7e1117b273743e84f">slaqgs</a> (<a class="el" href="structSuperMatrix.html">SuperMatrix</a> *A, float *r, float *c, float rowcnd, float colcnd, float amax, char *equed)</td></tr></table><hr><a name="_details"></a><h2>Detailed Description</h2><pre> -- SuperLU routine (version 2.0) -- Univ. of California Berkeley, Xerox Palo Alto Research Center, and Lawrence Berkeley National Lab. November 15, 1997</pre><p><pre> Modified from LAPACK routine SLAQGE </pre> <hr><h2>Define Documentation</h2><a class="anchor" name="0656018abfc9fa2821827415f5d5ea57"></a><!-- doxytag: member="slaqgs.c::THRESH" ref="0656018abfc9fa2821827415f5d5ea57" args="" --><p><table class="mdTable" cellpadding="2" cellspacing="0"> <tr> <td class="mdRow"> <table cellpadding="0" cellspacing="0" border="0"> <tr> <td class="md" nowrap valign="top">#define THRESH (0.1) </td> </tr> </table> </td> </tr></table><table cellspacing="5" cellpadding="0" border="0"> <tr> <td> </td> <td><p> </td> </tr></table><hr><h2>Function Documentation</h2><a class="anchor" name="f44216962efdebc7e1117b273743e84f"></a><!-- doxytag: member="slaqgs.c::slaqgs" ref="f44216962efdebc7e1117b273743e84f" args="(SuperMatrix *A, float *r, float *c, float rowcnd, float colcnd, float amax, char *equed)" --><p><table class="mdTable" cellpadding="2" cellspacing="0"> <tr> <td class="mdRow"> <table cellpadding="0" cellspacing="0" border="0"> <tr> <td class="md" nowrap valign="top">void slaqgs </td> <td class="md" valign="top">( </td> <td class="md" nowrap valign="top"><a class="el" href="structSuperMatrix.html">SuperMatrix</a> * </td> <td class="mdname" nowrap> <em>A</em>, </td> </tr> <tr> <td class="md" nowrap align="right"></td> <td class="md"></td> <td class="md" nowrap>float * </td> <td class="mdname" nowrap> <em>r</em>, </td> </tr> <tr> <td class="md" nowrap align="right"></td> <td class="md"></td> <td class="md" nowrap>float * </td> <td class="mdname" nowrap> <em>c</em>, </td> </tr> <tr> <td class="md" nowrap align="right"></td> <td class="md"></td> <td class="md" nowrap>float </td> <td class="mdname" nowrap> <em>rowcnd</em>, </td> </tr> <tr> <td class="md" nowrap align="right"></td> <td class="md"></td> <td class="md" nowrap>float </td> <td class="mdname" nowrap> <em>colcnd</em>, </td> </tr> <tr> <td class="md" nowrap align="right"></td> <td class="md"></td> <td class="md" nowrap>float </td> <td class="mdname" nowrap> <em>amax</em>, </td> </tr> <tr> <td class="md" nowrap align="right"></td> <td class="md"></td> <td class="md" nowrap>char * </td> <td class="mdname" nowrap> <em>equed</em></td> </tr> <tr> <td class="md"></td> <td class="md">) </td> <td class="md" colspan="2"></td> </tr> </table> </td> </tr></table><table cellspacing="5" cellpadding="0" border="0"> <tr> <td> </td> <td><p><pre> Purpose =======</pre><p><pre> SLAQGS equilibrates a general sparse M by N matrix A using the row and scaling factors in the vectors R and C.</pre><p><pre> See <a class="el" href="supermatrix_8h.html">supermatrix.h</a> for the definition of 'SuperMatrix' structure.</pre><p><pre> Arguments =========</pre><p><pre> A (input/output) SuperMatrix* On exit, the equilibrated matrix. See EQUED for the form of the equilibrated matrix. The type of A can be: Stype = NC; Dtype = SLU_S; Mtype = GE.</pre><p><pre> R (input) float*, dimension (A->nrow) The row scale factors for A.</pre><p><pre> C (input) float*, dimension (A->ncol) The column scale factors for A.</pre><p><pre> ROWCND (input) float Ratio of the smallest R(i) to the largest R(i).</pre><p><pre> COLCND (input) float Ratio of the smallest C(i) to the largest C(i).</pre><p><pre> AMAX (input) float Absolute value of largest matrix entry.</pre><p><pre> EQUED (output) char* Specifies the form of equilibration that was done. = 'N': No equilibration = 'R': Row equilibration, i.e., A has been premultiplied by diag(R). = 'C': Column equilibration, i.e., A has been postmultiplied by diag(C). = 'B': Both row and column equilibration, i.e., A has been replaced by diag(R) * A * diag(C).</pre><p><pre> Internal Parameters ===================</pre><p><pre> THRESH is a threshold value used to decide if row or column scaling should be done based on the ratio of the row or column scaling factors. If ROWCND < THRESH, row scaling is done, and if COLCND < THRESH, column scaling is done.</pre><p><pre> LARGE and SMALL are threshold values used to decide if row scaling should be done based on the absolute size of the largest matrix element. If AMAX > LARGE or AMAX < SMALL, row scaling is done.</pre><p><pre> ===================================================================== </pre> </td> </tr></table><hr size="1"><address style="align: right;"><small>Generated on Fri Aug 1 22:40:40 2008 for SuperLU by <a href="http://www.doxygen.org/index.html"><img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.4.6 </small></address></body></html>⌨️ 快捷键说明
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