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<div id="projectname">SuperLU
 <span id="projectnumber">5.2.2</span>
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<p>Estimates reciprocal of the condition number of a general matrix.
<a href="#details">More...</a></p>
<div class="textblock"><code>#include <math.h></code><br/>
<code>#include "<a class="el" href="slu__ddefs_8h_source.html">slu_ddefs.h</a>"</code><br/>
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Include dependency graph for dgscon.c:</div>
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Functions</h2></td></tr>
<tr class="memitem:a2c7a4267d306243d3ceb15531522033e"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="dgscon_8c.html#a2c7a4267d306243d3ceb15531522033e">dgscon</a> (char *norm, <a class="el" href="structSuperMatrix.html">SuperMatrix</a> *L, <a class="el" href="structSuperMatrix.html">SuperMatrix</a> *U, double anorm, double *rcond, <a class="el" href="structSuperLUStat__t.html">SuperLUStat_t</a> *stat, int *info)</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 5.0) --
Univ. of California Berkeley, Xerox Palo Alto Research Center,
and Lawrence Berkeley National Lab.
July 25, 2015</pre><pre>Modified from lapack routines DGECON.
</pre> </div><h2 class="groupheader">Function Documentation</h2>
<a class="anchor" id="a2c7a4267d306243d3ceb15531522033e"></a>
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<div class="memproto">
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<td class="memname">void dgscon </td>
<td>(</td>
<td class="paramtype">char * </td>
<td class="paramname"><em>norm</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>L</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>U</em>, </td>
</tr>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">double </td>
<td class="paramname"><em>anorm</em>, </td>
</tr>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">double * </td>
<td class="paramname"><em>rcond</em>, </td>
</tr>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="structSuperLUStat__t.html">SuperLUStat_t</a> * </td>
<td class="paramname"><em>stat</em>, </td>
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<td class="paramkey"></td>
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<td class="paramtype">int * </td>
<td class="paramname"><em>info</em> </td>
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<td>)</td>
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<pre>
<h1>Purpose
</h1>
</pre><pre></pre><pre> DGSCON estimates the reciprocal of the condition number of a general
real matrix A, in either the 1-norm or the infinity-norm, using
the LU factorization computed by DGETRF. *</pre><pre> An estimate is obtained for norm(inv(A)), and the reciprocal of the
condition number is computed as
RCOND = 1 / ( norm(A) * norm(inv(A)) ).</pre><pre> See <a class="el" href="supermatrix_8h.html" title="Defines matrix types. ">supermatrix.h</a> for the definition of '<a class="el" href="structSuperMatrix.html">SuperMatrix</a>' structure.</pre><pre><h1>Arguments
</h1>
</pre><pre></pre><pre> NORM (input) char*
Specifies whether the 1-norm condition number or the
infinity-norm condition number is required:
= '1' or 'O': 1-norm;
= 'I': Infinity-norm.</pre><pre> L (input) SuperMatrix*
The factor L from the factorization Pr*A*Pc=L*U as computed by
<a class="el" href="dgstrf_8c.html#a2dcd838f80168641f20fd576b4a51b25">dgstrf()</a>. Use compressed row subscripts storage for supernodes,
i.e., L has types: Stype = SLU_SC, Dtype = SLU_D, Mtype = SLU_TRLU.</pre><pre> U (input) SuperMatrix*
The factor U from the factorization Pr*A*Pc=L*U as computed by
<a class="el" href="dgstrf_8c.html#a2dcd838f80168641f20fd576b4a51b25">dgstrf()</a>. Use column-wise storage scheme, i.e., U has types:
Stype = SLU_NC, Dtype = SLU_D, Mtype = SLU_TRU.</pre><pre> ANORM (input) double
If NORM = '1' or 'O', the 1-norm of the original matrix A.
If NORM = 'I', the infinity-norm of the original matrix A.</pre><pre> RCOND (output) double*
The reciprocal of the condition number of the matrix A,
computed as RCOND = 1/(norm(A) * norm(inv(A))).</pre><pre> INFO (output) int*
= 0: successful exit
< 0: if INFO = -i, the i-th argument had an illegal value
</p>
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