<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html><head><meta http-equiv="Content-Type" content="text/html;charset=UTF-8"> <title>SuperLU: SRC/claqgs.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 1.5.5 --> <div class="navigation" id="top"> <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 class="current"><a href="files.html"><span>Files</span></a></li> </ul> </div> </div> <div class="contents"> <h1>SRC/claqgs.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__cdefs_8h-source.html">slu_cdefs.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="claqgs_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="claqgs_8c.html#0cf5dcef08d22df154acf807beb43ea1">claqgs</a> (<a class="el" href="structSuperMatrix.html">SuperMatrix</a> *<a class="el" href="ilu__zdrop__row_8c.html#c900805a486cbb8489e3c176ed6e0d8e">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 CLAQGE </pre> <hr><h2>Define Documentation</h2> <a class="anchor" name="0656018abfc9fa2821827415f5d5ea57"></a><!-- doxytag: member="claqgs.c::THRESH" ref="0656018abfc9fa2821827415f5d5ea57" args="" --> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">#define THRESH (0.1) </td> </tr> </table> </div> <div class="memdoc"> <p> </div> </div><p> <hr><h2>Function Documentation</h2> <a class="anchor" name="0cf5dcef08d22df154acf807beb43ea1"></a><!-- doxytag: member="claqgs.c::claqgs" ref="0cf5dcef08d22df154acf807beb43ea1" args="(SuperMatrix *A, float *r, float *c, float rowcnd, float colcnd, float amax, char *equed)" --> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">void claqgs </td> <td>(</td> <td class="paramtype"><a class="el" href="structSuperMatrix.html">SuperMatrix</a> * </td> <td class="paramname"> <em>A</em>, </td> </tr> <tr> <td class="paramkey"></td> <td></td> <td class="paramtype">float * </td> <td class="paramname"> <em>r</em>, </td> </tr> <tr> <td class="paramkey"></td> <td></td> <td class="paramtype">float * </td> <td class="paramname"> <em>c</em>, </td> </tr> <tr> <td class="paramkey"></td> <td></td> <td class="paramtype">float </td> <td class="paramname"> <em>rowcnd</em>, </td> </tr> <tr> <td class="paramkey"></td> <td></td> <td class="paramtype">float </td> <td class="paramname"> <em>colcnd</em>, </td> </tr> <tr> <td class="paramkey"></td> <td></td> <td class="paramtype">float </td> <td class="paramname"> <em>amax</em>, </td> </tr> <tr> <td class="paramkey"></td> <td></td> <td class="paramtype">char * </td> <td class="paramname"> <em>equed</em></td><td> </td> </tr> <tr> <td></td> <td>)</td> <td></td><td></td><td width="100%"></td> </tr> </table> </div> <div class="memdoc"> <p> <pre> Purpose =======</pre><p> <pre> CLAQGS 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" title="Defines matrix types.">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_C; 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> </div> </div><p> </div> <hr size="1"><address style="text-align: right;"><small>Generated on Thu Aug 25 13:43:49 2011 for SuperLU by <a href="http://www.doxygen.org/index.html"> <img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.5.5 </small></address> </body> </html>