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| <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> |
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| <tr> |
| <td class="memname">#define THRESH (0.1) </td> |
| </tr> |
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| <div class="memdoc"> |
| |
| <p> |
| |
| </div> |
| </div><p> |
| <hr><h2>Function Documentation</h2> |
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| <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> |
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| <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> |
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