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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><meta http-equiv="Content-Type" content="text/html;charset=iso-8859-1"><title>SuperLU: SRC/slacon.c File Reference</title><link href="doxygen.css" rel="stylesheet" type="text/css"><link href="tabs.css" rel="stylesheet" type="text/css"></head><body><!-- Generated by Doxygen 1.4.6 --><div class="tabs"> <ul> <li><a href="index.html"><span>Main Page</span></a></li> <li><a href="annotated.html"><span>Data Structures</span></a></li> <li id="current"><a href="files.html"><span>Files</span></a></li> </ul></div><div class="tabs"> <ul> <li><a href="files.html"><span>File List</span></a></li> <li><a href="globals.html"><span>Globals</span></a></li> </ul></div><h1>SRC/slacon.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><table border="0" cellpadding="0" cellspacing="0"><tr><td></td></tr><tr><td colspan="2"><br><h2>Defines</h2></td></tr><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><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><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="slacon_8c.html#865b6cfd089f47842f95ecfcb1c88355">slacon_</a> (int *n, float *v, float *x, int *isgn, float *est, int *kase)</td></tr></table><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>Define Documentation</h2><a class="anchor" name="51b3babab7bbf03500dbc5ede2a682b3"></a><!-- doxytag: member="slacon.c::d_sign" ref="51b3babab7bbf03500dbc5ede2a682b3" args="(a, b)" --><p><table class="mdTable" cellpadding="2" cellspacing="0"> <tr> <td class="mdRow"> <table cellpadding="0" cellspacing="0" border="0"> <tr> <td class="md" nowrap valign="top">#define d_sign </td> <td class="md" valign="top">( </td> <td class="md" nowrap valign="top">a, <tr> <td class="md" nowrap align="right"></td> <td class="md"></td> <td class="md" nowrap>b </td> <td class="mdname1" valign="top" nowrap> </td> <td class="md" valign="top"> ) </td> <td class="md" nowrap> (b >= 0 ? fabs(a) : -fabs(a))</td> </tr> </table> </td> </tr></table><table cellspacing="5" cellpadding="0" border="0"> <tr> <td> </td> <td><p> </td> </tr></table><a class="anchor" name="dccc1e5692ca1dd160d0ca2a17e1b12c"></a><!-- doxytag: member="slacon.c::i_dnnt" ref="dccc1e5692ca1dd160d0ca2a17e1b12c" args="(a)" --><p><table class="mdTable" cellpadding="2" cellspacing="0"> <tr> <td class="mdRow"> <table cellpadding="0" cellspacing="0" border="0"> <tr> <td class="md" nowrap valign="top">#define i_dnnt </td> <td class="md" valign="top">( </td> <td class="md" nowrap valign="top">a </td> <td class="mdname1" valign="top" nowrap> </td> <td class="md" valign="top"> ) </td> <td class="md" nowrap> ( a>=0 ? floor(a+.5) : -floor(.5-a) )</td> </tr> </table> </td> </tr></table><table cellspacing="5" cellpadding="0" border="0"> <tr> <td> </td> <td><p> </td> </tr></table><hr><h2>Function Documentation</h2><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)" --><p><table class="mdTable" cellpadding="2" cellspacing="0"> <tr> <td class="mdRow"> <table cellpadding="0" cellspacing="0" border="0"> <tr> <td class="md" nowrap valign="top">int slacon_ </td> <td class="md" valign="top">( </td> <td class="md" nowrap valign="top">int * </td> <td class="mdname" nowrap> <em>n</em>, </td> </tr> <tr> <td class="md" nowrap align="right"></td> <td class="md"></td> <td class="md" nowrap>float * </td> <td class="mdname" nowrap> <em>v</em>, </td> </tr> <tr> <td class="md" nowrap align="right"></td> <td class="md"></td> <td class="md" nowrap>float * </td> <td class="mdname" nowrap> <em>x</em>, </td> </tr> <tr> <td class="md" nowrap align="right"></td> <td class="md"></td> <td class="md" nowrap>int * </td> <td class="mdname" nowrap> <em>isgn</em>, </td> </tr> <tr> <td class="md" nowrap align="right"></td> <td class="md"></td> <td class="md" nowrap>float * </td> <td class="mdname" nowrap> <em>est</em>, </td> </tr> <tr> <td class="md" nowrap align="right"></td> <td class="md"></td> <td class="md" nowrap>int * </td> <td class="mdname" nowrap> <em>kase</em></td> </tr> <tr> <td class="md"></td> <td class="md">) </td> <td class="md" colspan="2"></td> </tr> </table> </td> </tr></table><table cellspacing="5" cellpadding="0" border="0"> <tr> <td> </td> <td><p><pre> Purpose =======</pre><p><pre> SLACON 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) FLOAT 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) FLOAT PRECISION array, dimension (N) On an intermediate return, X should be overwritten by A * X, if KASE=1, A' * X, if KASE=2, and SLACON must be re-called with all the other parameters unchanged.</pre><p><pre> ISGN (workspace) INT array, dimension (N)</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 SLACON, 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 SLACON, 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 complex matrix, with applications to condition estimation", ACM Trans. Math. Soft., vol. 14, no. 4, pp. 381-396, December 1988. ===================================================================== </pre> </td> </tr></table><hr size="1"><address style="align: right;"><small>Generated on Fri Aug 1 22:40:40 2008 for SuperLU by <a href="http://www.doxygen.org/index.html"><img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.4.6 </small></address></body></html>⌨️ 快捷键说明
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