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<div id="projectname">SuperLU
 <span id="projectnumber">5.2.0</span>
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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/>
</div><div class="textblock"><div class="dynheader">
Include dependency graph for dlacon.c:</div>
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<div class="center"><img src="dlacon_8c__incl.png" border="0" usemap="#SRC_2dlacon_8c" alt=""/></div>
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Macros</h2></td></tr>
<tr class="memitem:a51b3babab7bbf03500dbc5ede2a682b3"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="dlacon_8c.html#a51b3babab7bbf03500dbc5ede2a682b3">d_sign</a>(a, b)   (b >= 0 ? fabs(a) : -fabs(a)) /* Copy sign */</td></tr>
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<tr class="memitem:adccc1e5692ca1dd160d0ca2a17e1b12c"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="dlacon_8c.html#adccc1e5692ca1dd160d0ca2a17e1b12c">i_dnnt</a>(a)   ( a>=0 ? floor(a+.5) : -floor(.5-a) ) /* Round to nearest integer */</td></tr>
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Functions</h2></td></tr>
<tr class="memitem:a4187621e84a9554552e3fa8098542801"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="dlacon_8c.html#a4187621e84a9554552e3fa8098542801">dlacon_</a> (int *n, double *v, double *x, int *isgn, double *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">Macro Definition Documentation</h2>
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<td class="memname">#define d_sign</td>
<td>(</td>
<td class="paramtype"> </td>
<td class="paramname">a, </td>
</tr>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype"> </td>
<td class="paramname">b </td>
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<td>)</td>
<td></td><td>   (b >= 0 ? fabs(a) : -fabs(a)) /* Copy sign */</td>
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<td class="memname">#define i_dnnt</td>
<td>(</td>
<td class="paramtype"> </td>
<td class="paramname">a</td><td>)</td>
<td>   ( a>=0 ? floor(a+.5) : -floor(.5-a) ) /* Round to nearest integer */</td>
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<h2 class="groupheader">Function Documentation</h2>
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<td class="memname">int dlacon_ </td>
<td>(</td>
<td class="paramtype">int * </td>
<td class="paramname"><em>n</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">double * </td>
<td class="paramname"><em>v</em>, </td>
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<td class="paramkey"></td>
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<td class="paramtype">double * </td>
<td class="paramname"><em>x</em>, </td>
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<td class="paramtype">int * </td>
<td class="paramname"><em>isgn</em>, </td>
</tr>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">double * </td>
<td class="paramname"><em>est</em>, </td>
</tr>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">int * </td>
<td class="paramname"><em>kase</em> </td>
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<td>)</td>
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<pre>
<h1>Purpose
</h1>
</pre><pre></pre><pre> DLACON 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) DOUBLE 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) DOUBLE PRECISION array, dimension (N)
On an intermediate return, X should be overwritten by
A * X, if KASE=1,
A' * X, if KASE=2,
and DLACON must be re-called with all the other parameters
unchanged.</pre><pre> ISGN (workspace) INT array, dimension (N)</pre><pre> EST (output) DOUBLE PRECISION
An estimate (a lower bound) for norm(A).</pre><pre> KASE (input/output) INT
On the initial call to DLACON, 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 DLACON, 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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