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<title>SuperLU: SRC/zpivotgrowth.c File Reference</title>
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<h1>SRC/zpivotgrowth.c File Reference</h1>Computes the reciprocal pivot growth factor. <a href="#_details">More...</a>
<p>
<code>#include &lt;math.h&gt;</code><br>
<code>#include &quot;<a class="el" href="slu__zdefs_8h-source.html">slu_zdefs.h</a>&quot;</code><br>
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<tr><td colspan="2"><br><h2>Functions</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">double&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="zpivotgrowth_8c.html#713bc716e136b32dfad757a3fd7d3005">zPivotGrowth</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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<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> <hr><h2>Function Documentation</h2>
<a class="anchor" name="713bc716e136b32dfad757a3fd7d3005"></a><!-- doxytag: member="zpivotgrowth.c::zPivotGrowth" ref="713bc716e136b32dfad757a3fd7d3005" args="(int ncols, SuperMatrix *A, int *perm_c, SuperMatrix *L, SuperMatrix *U)" -->
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          <td class="memname">double zPivotGrowth           </td>
          <td>(</td>
          <td class="paramtype">int&nbsp;</td>
          <td class="paramname"> <em>ncols</em>, </td>
        </tr>
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          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype"><a class="el" href="structSuperMatrix.html">SuperMatrix</a> *&nbsp;</td>
          <td class="paramname"> <em>A</em>, </td>
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          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">int *&nbsp;</td>
          <td class="paramname"> <em>perm_c</em>, </td>
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          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype"><a class="el" href="structSuperMatrix.html">SuperMatrix</a> *&nbsp;</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> *&nbsp;</td>
          <td class="paramname"> <em>U</em></td><td>&nbsp;</td>
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          <td>)</td>
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<p>
<pre>
 Purpose
 =======</pre><p>
<pre> Compute the reciprocal pivot growth factor of the leading ncols columns
 of the matrix, using the formula:
     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>
<pre> Arguments
 =========</pre><p>
<pre> ncols    (input) int
          The number of columns of matrices A, L and U.</pre><p>
<pre> A        (input) SuperMatrix*
	    Original matrix A, permuted by columns, of dimension
          (A-&gt;nrow, A-&gt;ncol). The type of A can be:
          Stype = NC; Dtype = SLU_Z; Mtype = GE.</pre><p>
<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_Z; Mtype = TRLU.</pre><p>
<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_Z; Mtype = TRU.
 </pre> 
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