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<title>SuperLU: SRC/clacon.c File Reference</title>
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<h1>SRC/clacon.c File Reference</h1>Estimates the 1-norm. <a href="#_details">More...</a>
<p>
<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><td colspan="2"><br><h2>Functions</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="clacon_8c.html#f4536a78f0ee7097ef59278c8cf14295">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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<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="f4536a78f0ee7097ef59278c8cf14295"></a><!-- doxytag: member="clacon.c::clacon_" ref="f4536a78f0ee7097ef59278c8cf14295" args="(int *n, complex *v, complex *x, float *est, int *kase)" -->
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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="paramtype"><a class="el" href="structcomplex.html">complex</a> * </td>
<td class="paramname"> <em>v</em>, </td>
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<td class="paramtype"><a class="el" href="structcomplex.html">complex</a> * </td>
<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><td> </td>
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<pre>
Purpose
=======</pre><p>
<pre> CLACON estimates the 1-norm of a square matrix A.
Reverse communication is used for evaluating matrix-vector products.</pre><p>
<pre> Arguments
=========</pre><p>
<pre> N (input) INT
The order of the matrix. N >= 1.</pre><p>
<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><p>
<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><p>
<pre> EST (output) FLOAT PRECISION
An estimate (a lower bound) for norm(A).</pre><p>
<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><p>
<pre> Further Details
======= =======</pre><p>
<pre> Contributed by Nick Higham, University of Manchester.
Originally named CONEST, dated March 16, 1988.</pre><p>
<pre> Reference: N.J. Higham, "FORTRAN codes for estimating the one-norm of
a real or <a class="el" href="structcomplex.html">complex</a> matrix, with applications to condition estimation",
ACM Trans. Math. Soft., vol. 14, no. 4, pp. 381-396, December 1988.
=====================================================================
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