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<title>SuperLU: SRC/spivotgrowth.c File Reference</title>
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<h1>SRC/spivotgrowth.c File Reference</h1>Computes the reciprocal pivot growth factor. <a href="#_details">More...</a>
<p>
<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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<tr><td colspan="2"><br><h2>Functions</h2></td></tr>
<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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<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="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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<td class="memname">float sPivotGrowth </td>
<td>(</td>
<td class="paramtype">int </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> * </td>
<td class="paramname"> <em>A</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">int * </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> * </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><td> </td>
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<td>)</td>
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<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->nrow, A->ncol). The type of A can be:
Stype = NC; Dtype = SLU_S; 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_S; 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_S; Mtype = TRU.
</pre>
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