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| <h1>SRC/spivotL.c File Reference</h1>Performs numerical pivoting. <a href="#_details">More...</a> |
| <p> |
| <code>#include <math.h></code><br> |
| <code>#include <stdlib.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>Functions</h2></td></tr> |
| <tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="spivotL_8c.html#6adadb830ad13360ce6656212f49fb29">spivotL</a> (const int jcol, const double u, int *usepr, int *perm_r, int *iperm_r, int *iperm_c, int *pivrow, <a class="el" href="structGlobalLU__t.html">GlobalLU_t</a> *Glu, <a class="el" href="structSuperLUStat__t.html">SuperLUStat_t</a> *stat)</td></tr> |
| |
| </table> |
| <hr><a name="_details"></a><h2>Detailed Description</h2> |
| <pre> |
| -- SuperLU routine (version 3.0) -- |
| Univ. of California Berkeley, Xerox Palo Alto Research Center, |
| and Lawrence Berkeley National Lab. |
| October 15, 2003</pre><p> |
| <pre> Copyright (c) 1994 by Xerox Corporation. All rights reserved.</pre><p> |
| <pre> THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY |
| EXPRESSED OR IMPLIED. ANY USE IS AT YOUR OWN RISK.</pre><p> |
| <pre> Permission is hereby granted to use or copy this program for any |
| purpose, provided the above notices are retained on all copies. |
| Permission to modify the code and to distribute modified code is |
| granted, provided the above notices are retained, and a notice that |
| the code was modified is included with the above copyright notice. |
| </pre> <hr><h2>Function Documentation</h2> |
| <a class="anchor" name="6adadb830ad13360ce6656212f49fb29"></a> |
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| <div class="memproto"> |
| <table class="memname"> |
| <tr> |
| <td class="memname">int spivotL </td> |
| <td>(</td> |
| <td class="paramtype">const int </td> |
| <td class="paramname"> <em>jcol</em>, </td> |
| </tr> |
| <tr> |
| <td class="paramkey"></td> |
| <td></td> |
| <td class="paramtype">const double </td> |
| <td class="paramname"> <em>u</em>, </td> |
| </tr> |
| <tr> |
| <td class="paramkey"></td> |
| <td></td> |
| <td class="paramtype">int * </td> |
| <td class="paramname"> <em>usepr</em>, </td> |
| </tr> |
| <tr> |
| <td class="paramkey"></td> |
| <td></td> |
| <td class="paramtype">int * </td> |
| <td class="paramname"> <em>perm_r</em>, </td> |
| </tr> |
| <tr> |
| <td class="paramkey"></td> |
| <td></td> |
| <td class="paramtype">int * </td> |
| <td class="paramname"> <em>iperm_r</em>, </td> |
| </tr> |
| <tr> |
| <td class="paramkey"></td> |
| <td></td> |
| <td class="paramtype">int * </td> |
| <td class="paramname"> <em>iperm_c</em>, </td> |
| </tr> |
| <tr> |
| <td class="paramkey"></td> |
| <td></td> |
| <td class="paramtype">int * </td> |
| <td class="paramname"> <em>pivrow</em>, </td> |
| </tr> |
| <tr> |
| <td class="paramkey"></td> |
| <td></td> |
| <td class="paramtype"><a class="el" href="structGlobalLU__t.html">GlobalLU_t</a> * </td> |
| <td class="paramname"> <em>Glu</em>, </td> |
| </tr> |
| <tr> |
| <td class="paramkey"></td> |
| <td></td> |
| <td class="paramtype"><a class="el" href="structSuperLUStat__t.html">SuperLUStat_t</a> * </td> |
| <td class="paramname"> <em>stat</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 |
| ======= |
| Performs the numerical pivoting on the current column of L, |
| and the CDIV operation.</pre><p> |
| <pre> Pivot policy: |
| (1) Compute thresh = u * max_(i>=j) <a class="el" href="slamch_8c.html#3aa069ac3980707dae1e0530f50d59e4">abs(A_ij)</a>; |
| (2) IF user specifies pivot row k and <a class="el" href="slamch_8c.html#3aa069ac3980707dae1e0530f50d59e4">abs(A_kj)</a> >= thresh THEN |
| pivot row = k; |
| ELSE IF <a class="el" href="slamch_8c.html#3aa069ac3980707dae1e0530f50d59e4">abs(A_jj)</a> >= thresh THEN |
| pivot row = j; |
| ELSE |
| pivot row = m;</pre><p> |
| <pre> Note: If you absolutely want to use a given pivot order, then set u=0.0.</pre><p> |
| <pre> Return value: 0 success; |
| i > 0 U(i,i) is exactly zero. |
| </pre> |
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