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| <h1>SRC/ilu_zpivotL.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__zdefs_8h-source.html">slu_zdefs.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="ilu__zpivotL_8c.html#95ed41486ca0ed53262e4b8934d4afac">SGN</a>(x) ((x)>=0?1:-1)</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="ilu__zpivotL_8c.html#857e99bebbdf102f2b9d2ef4a25d1135">ilu_zpivotL</a> (const int jcol, const double u, int *usepr, int *perm_r, int diagind, int *swap, int *iswap, int *marker, int *pivrow, double fill_tol, <a class="el" href="superlu__enum__consts_8h.html#0cb73c13a7c2390c3a9a0a8913477ff0">milu_t</a> milu, <a class="el" href="structdoublecomplex.html">doublecomplex</a> drop_sum, <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 4.0) -- |
| Lawrence Berkeley National Laboratory |
| June 30, 2009 |
| </pre> <hr><h2>Define Documentation</h2> |
| <a class="anchor" name="95ed41486ca0ed53262e4b8934d4afac"></a> |
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| <tr> |
| <td class="memname">#define SGN </td> |
| <td>(</td> |
| <td class="paramtype">x </td> |
| <td class="paramname"> </td> |
| <td> ) </td> |
| <td width="100%"> ((x)>=0?1:-1)</td> |
| </tr> |
| </table> |
| </div> |
| <div class="memdoc"> |
| |
| <p> |
| |
| </div> |
| </div><p> |
| <hr><h2>Function Documentation</h2> |
| <a class="anchor" name="857e99bebbdf102f2b9d2ef4a25d1135"></a> |
| <div class="memitem"> |
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| <table class="memname"> |
| <tr> |
| <td class="memname">int ilu_zpivotL </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>diagind</em>, </td> |
| </tr> |
| <tr> |
| <td class="paramkey"></td> |
| <td></td> |
| <td class="paramtype">int * </td> |
| <td class="paramname"> <em>swap</em>, </td> |
| </tr> |
| <tr> |
| <td class="paramkey"></td> |
| <td></td> |
| <td class="paramtype">int * </td> |
| <td class="paramname"> <em>iswap</em>, </td> |
| </tr> |
| <tr> |
| <td class="paramkey"></td> |
| <td></td> |
| <td class="paramtype">int * </td> |
| <td class="paramname"> <em>marker</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">double </td> |
| <td class="paramname"> <em>fill_tol</em>, </td> |
| </tr> |
| <tr> |
| <td class="paramkey"></td> |
| <td></td> |
| <td class="paramtype"><a class="el" href="superlu__enum__consts_8h.html#0cb73c13a7c2390c3a9a0a8913477ff0">milu_t</a> </td> |
| <td class="paramname"> <em>milu</em>, </td> |
| </tr> |
| <tr> |
| <td class="paramkey"></td> |
| <td></td> |
| <td class="paramtype"><a class="el" href="structdoublecomplex.html">doublecomplex</a> </td> |
| <td class="paramname"> <em>drop_sum</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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| </div><p> |
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