<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html><head><meta http-equiv="Content-Type" content="text/html;charset=UTF-8"> <title>SuperLU: SRC/dlangs.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 1.5.5 --> <div class="navigation" id="top"> <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 class="current"><a href="files.html"><span>Files</span></a></li> </ul> </div> </div> <div class="contents"> <h1>SRC/dlangs.c File Reference</h1>Returns the value of the one norm. <a href="#_details">More...</a> <p> <code>#include <math.h></code><br> <code>#include "<a class="el" href="slu__ddefs_8h-source.html">slu_ddefs.h</a>"</code><br> <table border="0" cellpadding="0" cellspacing="0"> <tr><td></td></tr> <tr><td colspan="2"><br><h2>Functions</h2></td></tr> <tr><td class="memItemLeft" nowrap align="right" valign="top">double </td><td class="memItemRight" valign="bottom"><a class="el" href="dlangs_8c.html#75a53f4464b95c63adad9e1f63f44d1c">dlangs</a> (char *norm, <a class="el" href="structSuperMatrix.html">SuperMatrix</a> *<a class="el" href="ilu__zdrop__row_8c.html#c900805a486cbb8489e3c176ed6e0d8e">A</a>)</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><p> <pre> Modified from lapack routine DLANGE </pre> <hr><h2>Function Documentation</h2> <a class="anchor" name="75a53f4464b95c63adad9e1f63f44d1c"></a><!-- doxytag: member="dlangs.c::dlangs" ref="75a53f4464b95c63adad9e1f63f44d1c" args="(char *norm, SuperMatrix *A)" --> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">double dlangs </td> <td>(</td> <td class="paramtype">char * </td> <td class="paramname"> <em>norm</em>, </td> </tr> <tr> <td class="paramkey"></td> <td></td> <td class="paramtype"><a class="el" href="structSuperMatrix.html">SuperMatrix</a> * </td> <td class="paramname"> <em>A</em></td><td> </td> </tr> <tr> <td></td> <td>)</td> <td></td><td></td><td width="100%"></td> </tr> </table> </div> <div class="memdoc"> <p> <pre> Purpose =======</pre><p> <pre> DLANGS returns the value of the one norm, or the Frobenius norm, or the infinity norm, or the element of largest absolute value of a real matrix A.</pre><p> <pre> Description ===========</pre><p> <pre> DLANGE returns the value</pre><p> <pre> DLANGE = ( max(abs(A(i,j))), NORM = 'M' or 'm' ( ( norm1(A), NORM = '1', 'O' or 'o' ( ( normI(A), NORM = 'I' or 'i' ( ( normF(A), NORM = 'F', 'f', 'E' or 'e'</pre><p> <pre> where norm1 denotes the one norm of a matrix (maximum column sum), normI denotes the infinity norm of a matrix (maximum row sum) and normF denotes the Frobenius norm of a matrix (square root of sum of squares). Note that max(abs(A(i,j))) is not a matrix norm.</pre><p> <pre> Arguments =========</pre><p> <pre> NORM (input) CHARACTER*1 Specifies the value to be returned in DLANGE as described above. A (input) SuperMatrix* The M by N sparse matrix A.</pre><p> <pre> ===================================================================== </pre> </div> </div><p> </div> <hr size="1"><address style="text-align: right;"><small>Generated on Thu Aug 25 13:43:49 2011 for SuperLU by <a href="http://www.doxygen.org/index.html"> <img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.5.5 </small></address> </body> </html>