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 <span id="projectnumber">5.2.2</span>
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<p>Computes the reciprocal pivot growth factor.
<a href="#details">More...</a></p>
<div class="textblock"><code>#include <math.h></code><br/>
<code>#include "<a class="el" href="slu__sdefs_8h_source.html">slu_sdefs.h</a>"</code><br/>
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Include dependency graph for spivotgrowth.c:</div>
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Functions</h2></td></tr>
<tr class="memitem:a9079b4ce43557af65fee107bc8f8d66f"><td class="memItemLeft" align="right" valign="top">float </td><td class="memItemRight" valign="bottom"><a class="el" href="spivotgrowth_8c.html#a9079b4ce43557af65fee107bc8f8d66f">sPivotGrowth</a> (int ncols, <a class="el" href="structSuperMatrix.html">SuperMatrix</a> *<a class="el" href="ilu__zdrop__row_8c.html#ac900805a486cbb8489e3c176ed6e0d8e">A</a>, int *perm_c, <a class="el" href="structSuperMatrix.html">SuperMatrix</a> *L, <a class="el" href="structSuperMatrix.html">SuperMatrix</a> *U)</td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p>Copyright (c) 2003, The Regents of the University of California, through Lawrence Berkeley National Laboratory (subject to receipt of any required approvals from U.S. Dept. of Energy)</p>
<p>All rights reserved.</p>
<p>The source code is distributed under BSD license, see the file License.txt at the top-level directory.</p>
<pre>
– SuperLU routine (version 2.0) –
Univ. of California Berkeley, Xerox Palo Alto Research Center,
and Lawrence Berkeley National Lab.
November 15, 1997
</pre> </div><h2 class="groupheader">Function Documentation</h2>
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<td class="memname">float sPivotGrowth </td>
<td>(</td>
<td class="paramtype">int </td>
<td class="paramname"><em>ncols</em>, </td>
</tr>
<tr>
<td class="paramkey"></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">int * </td>
<td class="paramname"><em>perm_c</em>, </td>
</tr>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="structSuperMatrix.html">SuperMatrix</a> * </td>
<td class="paramname"><em>L</em>, </td>
</tr>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="structSuperMatrix.html">SuperMatrix</a> * </td>
<td class="paramname"><em>U</em> </td>
</tr>
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<td>)</td>
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<pre>
<h1>Purpose
</h1>
</pre><pre></pre><pre>Compute the reciprocal pivot growth factor of the leading ncols columns
of the matrix, using the formula:
min_j ( max_i(abs(A_ij)) / max_i(abs(U_ij)) )</pre><pre><h1>Arguments
</h1>
</pre><pre></pre><pre>ncols (input) int
The number of columns of matrices A, L and U.</pre><pre>A (input) SuperMatrix*
Original matrix A, permuted by columns, of dimension
(A->nrow, A->ncol). The type of A can be:
Stype = NC; Dtype = SLU_S; Mtype = GE.</pre><pre>L (output) SuperMatrix*
The factor L from the factorization Pr*A=L*U; use compressed row
subscripts storage for supernodes, i.e., L has type:
Stype = SC; Dtype = SLU_S; Mtype = TRLU.</pre><pre>U (output) SuperMatrix*
The factor U from the factorization Pr*A*Pc=L*U. Use column-wise
storage scheme, i.e., U has types: Stype = NC;
Dtype = SLU_S; Mtype = TRU.
</pre>
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