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<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>
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<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>
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<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)" -->
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<td class="memname">double dlangs </td>
<td>(</td>
<td class="paramtype">char * </td>
<td class="paramname"> <em>norm</em>, </td>
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<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>
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<td>)</td>
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<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>
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