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110 lines
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<html><head><meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
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<title>SuperLU: SRC/spivotgrowth.c File Reference</title>
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<link href="doxygen.css" rel="stylesheet" type="text/css">
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<link href="tabs.css" rel="stylesheet" type="text/css">
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</head><body>
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<!-- Generated by Doxygen 1.5.5 -->
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<div class="navigation" id="top">
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<div class="tabs">
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<ul>
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<li><a href="index.html"><span>Main Page</span></a></li>
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<li><a href="annotated.html"><span>Data Structures</span></a></li>
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<li class="current"><a href="files.html"><span>Files</span></a></li>
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</div>
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<div class="contents">
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<h1>SRC/spivotgrowth.c File Reference</h1>Computes the reciprocal pivot growth factor. <a href="#_details">More...</a>
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<p>
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<code>#include <math.h></code><br>
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<code>#include "<a class="el" href="slu__sdefs_8h-source.html">slu_sdefs.h</a>"</code><br>
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<table border="0" cellpadding="0" cellspacing="0">
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<tr><td></td></tr>
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<tr><td colspan="2"><br><h2>Functions</h2></td></tr>
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<tr><td class="memItemLeft" nowrap align="right" valign="top">float </td><td class="memItemRight" valign="bottom"><a class="el" href="spivotgrowth_8c.html#9079b4ce43557af65fee107bc8f8d66f">sPivotGrowth</a> (int ncols, <a class="el" href="structSuperMatrix.html">SuperMatrix</a> *<a class="el" href="ilu__zdrop__row_8c.html#c900805a486cbb8489e3c176ed6e0d8e">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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</table>
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<hr><a name="_details"></a><h2>Detailed Description</h2>
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<pre>
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-- SuperLU routine (version 2.0) --
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Univ. of California Berkeley, Xerox Palo Alto Research Center,
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and Lawrence Berkeley National Lab.
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November 15, 1997
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</pre> <hr><h2>Function Documentation</h2>
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<a class="anchor" name="9079b4ce43557af65fee107bc8f8d66f"></a><!-- doxytag: member="spivotgrowth.c::sPivotGrowth" ref="9079b4ce43557af65fee107bc8f8d66f" args="(int ncols, SuperMatrix *A, int *perm_c, SuperMatrix *L, SuperMatrix *U)" -->
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<div class="memitem">
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<div class="memproto">
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<table class="memname">
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<tr>
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<td class="memname">float sPivotGrowth </td>
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<td>(</td>
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<td class="paramtype">int </td>
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<td class="paramname"> <em>ncols</em>, </td>
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</tr>
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<tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype"><a class="el" href="structSuperMatrix.html">SuperMatrix</a> * </td>
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<td class="paramname"> <em>A</em>, </td>
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</tr>
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<tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">int * </td>
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<td class="paramname"> <em>perm_c</em>, </td>
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</tr>
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<tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype"><a class="el" href="structSuperMatrix.html">SuperMatrix</a> * </td>
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<td class="paramname"> <em>L</em>, </td>
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</tr>
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<tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype"><a class="el" href="structSuperMatrix.html">SuperMatrix</a> * </td>
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<td class="paramname"> <em>U</em></td><td> </td>
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</tr>
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<tr>
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<td></td>
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<td>)</td>
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<td></td><td></td><td width="100%"></td>
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</tr>
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</table>
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</div>
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<div class="memdoc">
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<p>
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<pre>
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Purpose
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=======</pre><p>
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<pre> Compute the reciprocal pivot growth factor of the leading ncols columns
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of the matrix, using the formula:
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min_j ( max_i(<a class="el" href="slamch_8c.html#3aa069ac3980707dae1e0530f50d59e4">abs(A_ij)</a>) / max_i(<a class="el" href="slamch_8c.html#3aa069ac3980707dae1e0530f50d59e4">abs(U_ij)</a>) )</pre><p>
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<pre> Arguments
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=========</pre><p>
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<pre> ncols (input) int
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The number of columns of matrices A, L and U.</pre><p>
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<pre> A (input) SuperMatrix*
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Original matrix A, permuted by columns, of dimension
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(A->nrow, A->ncol). The type of A can be:
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Stype = NC; Dtype = SLU_S; Mtype = GE.</pre><p>
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<pre> L (output) SuperMatrix*
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The factor L from the factorization Pr*A=L*U; use compressed row
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subscripts storage for supernodes, i.e., L has type:
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Stype = SC; Dtype = SLU_S; Mtype = TRLU.</pre><p>
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<pre> U (output) SuperMatrix*
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The factor U from the factorization Pr*A*Pc=L*U. Use column-wise
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storage scheme, i.e., U has types: Stype = NC;
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Dtype = SLU_S; Mtype = TRU.
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</pre>
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</div>
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</div><p>
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</div>
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<hr size="1"><address style="text-align: right;"><small>Generated on Mon Nov 22 10:23:48 2010 for SuperLU by
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<a href="http://www.doxygen.org/index.html">
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<img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.5.5 </small></address>
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