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<div class="headertitle"><div class="title">zpivotgrowth.c File Reference</div></div>
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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__zdefs_8h_source.html">slu_zdefs.h</a>"</code><br />
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Functions</h2></td></tr>
<tr class="memitem:a713bc716e136b32dfad757a3fd7d3005"><td class="memItemLeft" align="right" valign="top">double </td><td class="memItemRight" valign="bottom"><a class="el" href="zpivotgrowth_8c.html#a713bc716e136b32dfad757a3fd7d3005">zPivotGrowth</a> (int ncols, <a class="el" href="structSuperMatrix.html">SuperMatrix</a> *<a class="el" href="zsymv_8c.html#af5d6242ff783dd9efca51eeec1c234f7">A</a>, int *perm_c, <a class="el" href="structSuperMatrix.html">SuperMatrix</a> *L, <a class="el" href="structSuperMatrix.html">SuperMatrix</a> *<a class="el" href="zlarnv_8c.html#aa856a8508457fb5628c7d60f266c5596">U</a>)</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>
<a id="a713bc716e136b32dfad757a3fd7d3005" name="a713bc716e136b32dfad757a3fd7d3005"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a713bc716e136b32dfad757a3fd7d3005">◆ </a></span>zPivotGrowth()</h2>
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<td class="memname">double zPivotGrowth </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>
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<td class="paramkey"></td>
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<td class="paramtype">int * </td>
<td class="paramname"><em>perm_c</em>, </td>
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<td class="paramkey"></td>
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<td class="paramname"><em>L</em>, </td>
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<td class="paramkey"></td>
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<td class="paramtype"><a class="el" href="structSuperMatrix.html">SuperMatrix</a> * </td>
<td class="paramname"><em>U</em> </td>
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<td>)</td>
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<pre>
Purpose
=======
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)) )
Arguments
=========
ncols (input) int
The number of columns of matrices A, L and U.
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_Z; Mtype = GE.
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.
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.
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