176 lines
7.1 KiB
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176 lines
7.1 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<html><head><meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
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<title>SuperLU: SRC/slacon.c File Reference</title>
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<link href="doxygen.css" rel="stylesheet" type="text/css">
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<!-- Generated by Doxygen 1.5.5 -->
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<li><a href="index.html"><span>Main Page</span></a></li>
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<li><a href="annotated.html"><span>Data Structures</span></a></li>
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<li class="current"><a href="files.html"><span>Files</span></a></li>
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<h1>SRC/slacon.c File Reference</h1>Estimates the 1-norm. <a href="#_details">More...</a>
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<p>
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<code>#include <math.h></code><br>
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<code>#include "<a class="el" href="slu__Cnames_8h-source.html">slu_Cnames.h</a>"</code><br>
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<table border="0" cellpadding="0" cellspacing="0">
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<tr><td></td></tr>
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<tr><td colspan="2"><br><h2>Defines</h2></td></tr>
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<tr><td class="memItemLeft" nowrap align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="slacon_8c.html#51b3babab7bbf03500dbc5ede2a682b3">d_sign</a>(a, b) (b >= 0 ? fabs(a) : -fabs(a))</td></tr>
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<tr><td class="memItemLeft" nowrap align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="slacon_8c.html#dccc1e5692ca1dd160d0ca2a17e1b12c">i_dnnt</a>(a) ( a>=0 ? floor(a+.5) : -floor(.5-a) )</td></tr>
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<tr><td colspan="2"><br><h2>Functions</h2></td></tr>
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<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="slacon_8c.html#865b6cfd089f47842f95ecfcb1c88355">slacon_</a> (int *n, float *v, float *x, int *isgn, float *est, int *kase)</td></tr>
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</table>
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<hr><a name="_details"></a><h2>Detailed Description</h2>
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<pre>
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-- SuperLU routine (version 2.0) --
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Univ. of California Berkeley, Xerox Palo Alto Research Center,
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and Lawrence Berkeley National Lab.
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November 15, 1997
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</pre> <hr><h2>Define Documentation</h2>
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<a class="anchor" name="51b3babab7bbf03500dbc5ede2a682b3"></a><!-- doxytag: member="slacon.c::d_sign" ref="51b3babab7bbf03500dbc5ede2a682b3" args="(a, b)" -->
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<div class="memitem">
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<table class="memname">
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<tr>
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<td class="memname">#define d_sign </td>
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<td>(</td>
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<td class="paramtype">a, <tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">b </td>
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<td class="paramname"> </td>
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<td> ) </td>
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<td width="100%"> (b >= 0 ? fabs(a) : -fabs(a))</td>
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</tr>
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</table>
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</div>
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<div class="memdoc">
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<p>
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</div>
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</div><p>
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<a class="anchor" name="dccc1e5692ca1dd160d0ca2a17e1b12c"></a><!-- doxytag: member="slacon.c::i_dnnt" ref="dccc1e5692ca1dd160d0ca2a17e1b12c" args="(a)" -->
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<div class="memitem">
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<div class="memproto">
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<table class="memname">
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<tr>
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<td class="memname">#define i_dnnt </td>
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<td>(</td>
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<td class="paramtype">a </td>
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<td class="paramname"> </td>
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<td> ) </td>
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<td width="100%"> ( a>=0 ? floor(a+.5) : -floor(.5-a) )</td>
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</tr>
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</table>
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<div class="memdoc">
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<p>
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</div>
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</div><p>
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<hr><h2>Function Documentation</h2>
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<a class="anchor" name="865b6cfd089f47842f95ecfcb1c88355"></a><!-- doxytag: member="slacon.c::slacon_" ref="865b6cfd089f47842f95ecfcb1c88355" args="(int *n, float *v, float *x, int *isgn, float *est, int *kase)" -->
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<td class="memname">int slacon_ </td>
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<td>(</td>
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<td class="paramtype">int * </td>
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<td class="paramname"> <em>n</em>, </td>
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</tr>
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<tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">float * </td>
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<td class="paramname"> <em>v</em>, </td>
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</tr>
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<tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">float * </td>
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<td class="paramname"> <em>x</em>, </td>
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</tr>
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<tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">int * </td>
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<td class="paramname"> <em>isgn</em>, </td>
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</tr>
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<tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">float * </td>
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<td class="paramname"> <em>est</em>, </td>
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</tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">int * </td>
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<td class="paramname"> <em>kase</em></td><td> </td>
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</tr>
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<tr>
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<td></td>
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<td>)</td>
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<td></td><td></td><td width="100%"></td>
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</tr>
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</table>
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</div>
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<div class="memdoc">
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<p>
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<pre>
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Purpose
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=======</pre><p>
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<pre> SLACON estimates the 1-norm of a square matrix A.
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Reverse communication is used for evaluating matrix-vector products.</pre><p>
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<pre> Arguments
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=========</pre><p>
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<pre> N (input) INT
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The order of the matrix. N >= 1.</pre><p>
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<pre> V (workspace) FLOAT PRECISION array, dimension (N)
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On the final return, V = A*W, where EST = norm(V)/norm(W)
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(W is not returned).</pre><p>
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<pre> X (input/output) FLOAT PRECISION array, dimension (N)
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On an intermediate return, X should be overwritten by
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A * X, if KASE=1,
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A' * X, if KASE=2,
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and SLACON must be re-called with all the other parameters
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unchanged.</pre><p>
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<pre> ISGN (workspace) INT array, dimension (N)</pre><p>
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<pre> EST (output) FLOAT PRECISION
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An estimate (a lower bound) for norm(A).</pre><p>
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<pre> KASE (input/output) INT
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On the initial call to SLACON, KASE should be 0.
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On an intermediate return, KASE will be 1 or 2, indicating
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whether X should be overwritten by A * X or A' * X.
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On the final return from SLACON, KASE will again be 0.</pre><p>
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<pre> Further Details
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======= =======</pre><p>
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<pre> Contributed by Nick Higham, University of Manchester.
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Originally named CONEST, dated March 16, 1988.</pre><p>
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<pre> Reference: N.J. Higham, "FORTRAN codes for estimating the one-norm of
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a real or <a class="el" href="structcomplex.html">complex</a> matrix, with applications to condition estimation",
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ACM Trans. Math. Soft., vol. 14, no. 4, pp. 381-396, December 1988.
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=====================================================================
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</pre>
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</div>
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<hr size="1"><address style="text-align: right;"><small>Generated on Mon Nov 22 10:23:48 2010 for SuperLU by
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<img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.5.5 </small></address>
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