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<p>Estimates the 1-norm.
<a href="#details">More...</a></p>
<div class="textblock"><code>#include <math.h></code><br/>
<code>#include "<a class="el" href="slu__Cnames_8h_source.html">slu_Cnames.h</a>"</code><br/>
<code>#include "<a class="el" href="slu__scomplex_8h_source.html">slu_scomplex.h</a>"</code><br/>
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<tr class="memitem:af4536a78f0ee7097ef59278c8cf14295"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="clacon_8c.html#af4536a78f0ee7097ef59278c8cf14295">clacon_</a> (int *n, <a class="el" href="structcomplex.html">complex</a> *v, <a class="el" href="structcomplex.html">complex</a> *x, float *est, int *kase)</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>
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<td class="memname">int clacon_ </td>
<td>(</td>
<td class="paramtype">int * </td>
<td class="paramname"><em>n</em>, </td>
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<td class="paramkey"></td>
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<td class="paramtype"><a class="el" href="structcomplex.html">complex</a> * </td>
<td class="paramname"><em>v</em>, </td>
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<td class="paramname"><em>x</em>, </td>
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<td class="paramtype">float * </td>
<td class="paramname"><em>est</em>, </td>
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<td class="paramtype">int * </td>
<td class="paramname"><em>kase</em> </td>
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<pre>
<h1>Purpose
</h1>
</pre><pre></pre><pre> CLACON estimates the 1-norm of a square matrix A.
Reverse communication is used for evaluating matrix-vector products.</pre><pre><h1>Arguments
</h1>
</pre><pre></pre><pre> N (input) INT
The order of the matrix. N >= 1.</pre><pre> V (workspace) COMPLEX PRECISION array, dimension (N)
On the final return, V = A*W, where EST = norm(V)/norm(W)
(W is not returned).</pre><pre> X (input/output) COMPLEX PRECISION array, dimension (N)
On an intermediate return, X should be overwritten by
A * X, if KASE=1,
A' * X, if KASE=2,
where A' is the conjugate transpose of A,
and CLACON must be re-called with all the other parameters
unchanged.</pre><pre> EST (output) FLOAT PRECISION
An estimate (a lower bound) for norm(A).</pre><pre> KASE (input/output) INT
On the initial call to CLACON, KASE should be 0.
On an intermediate return, KASE will be 1 or 2, indicating
whether X should be overwritten by A * X or A' * X.
On the final return from CLACON, KASE will again be 0.</pre><pre> Further Details
======= =======</pre><pre> Contributed by Nick Higham, University of Manchester.
Originally named CONEST, dated March 16, 1988.</pre><pre> Reference: N.J. Higham, "FORTRAN codes for estimating the one-norm of
a real or complex matrix, with applications to condition estimation",
</p>
<h1>ACM Trans. Math. Soft., vol. 14, no. 4, pp. 381-396, December 1988.
</h1>
</pre><pre>
</pre>
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