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<div id="projectname">SuperLU
 <span id="projectnumber">5.2.2</span>
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<p>Returns the value of the one norm.
<a href="#details">More...</a></p>
<div class="textblock"><code>#include <math.h></code><br/>
<code>#include "<a class="el" href="slu__sdefs_8h_source.html">slu_sdefs.h</a>"</code><br/>
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Include dependency graph for slangs.c:</div>
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<div class="center"><img src="slangs_8c__incl.png" border="0" usemap="#SRC_2slangs_8c" alt=""/></div>
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<area shape="rect" id="node3" href="slu__sdefs_8h.html" title="Header file for real operations. " alt="" coords="285,80,373,107"/><area shape="rect" id="node9" href="slu__Cnames_8h.html" title="Macros defining how C routines will be called. " alt="" coords="332,155,439,181"/><area shape="rect" id="node10" href="supermatrix_8h.html" title="Defines matrix types. " alt="" coords="463,155,564,181"/><area shape="rect" id="node11" href="slu__util_8h.html" title="Utility header file. " alt="" coords="143,155,216,181"/><area shape="rect" id="node13" href="superlu__enum__consts_8h.html" title="enum constants header file " alt="" coords="131,229,289,256"/></map>
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Functions</h2></td></tr>
<tr class="memitem:a201bfd9f2017cf5904aada9f21f23ab2"><td class="memItemLeft" align="right" valign="top">float </td><td class="memItemRight" valign="bottom"><a class="el" href="slangs_8c.html#a201bfd9f2017cf5904aada9f21f23ab2">slangs</a> (char *norm, <a class="el" href="structSuperMatrix.html">SuperMatrix</a> *<a class="el" href="ilu__zdrop__row_8c.html#ac900805a486cbb8489e3c176ed6e0d8e">A</a>)</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><pre>Modified from lapack routine SLANGE
</pre> </div><h2 class="groupheader">Function Documentation</h2>
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<td class="memname">float slangs </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>
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<pre>
<h1>Purpose
</h1>
</pre><pre></pre><pre> SLANGS 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><pre><h1>Description
</h1>
</pre><pre></pre><pre> SLANGE returns the value</pre><pre> SLANGE = ( max(<a class="el" href="mc64ad_8c.html#a6a010865b10e541735fa2da8f3cd062d">abs(A(i,j))</a>), 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><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(<a class="el" href="mc64ad_8c.html#a6a010865b10e541735fa2da8f3cd062d">abs(A(i,j))</a>) is not a matrix norm.</pre><pre><h1>Arguments
</h1>
</pre><pre></pre><pre> NORM (input) CHARACTER*1
Specifies the value to be returned in SLANGE as described above.
A (input) SuperMatrix*
The M by N sparse matrix A.
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