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muParser - a fast math parser library
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<div style="font-size:10pt;">Version 2.0.0</div>
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<h3 class="navi_heading navi_info">Introduction</h3>
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<a href="index.html">About the parser</a><br/>
<a href="mup_intro.html#idRelNote">Release notes</a><br/>
<a href="http://sourceforge.net/news/?group_id=137191">News</a><br/>
<a href="mup_links.html">Software using muParser</a><br/>
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<h3 class="navi_heading navi_list">Math parser interface</h3>
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<a href="mup_interface.html#idInit">Parser (de)initialization</a><br/>
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<h2><a id="idExample"></a>Example code</h2>
<p>
If you put all this together, you get the source code for a small application. The application defines a parser variables ("<code>a</code>") and adds
a user defined functions named "<code>MyFunc</code>". When using the parser make sure that you don't forget to catch the <code>Parser::exception_type</code> in your application. It contains detailed information helping you to find syntax errors in your formula.
</p>
<pre>
<span class="code_pp">#include <iostream></span>
<span class="code_pp">#include "muParser.h"</span>
<span class="code_cmt">// Function callback</span>
<span class="code_kw">double</span> MySqr(<span class="code_kw">double</span> a_fVal)
{
<span class="code_kw">return</span> a_fVal*a_fVal;
}
<span class="code_cmt">// main program</span>
<span class="code_kw">int</span> main(<span class="code_kw">int</span> argc, <span class="code_kw">char</span>* argv[])
{
<span class="code_kw">using namespace</span> mu;
<span class="code_kw">try</span>
{
<span class="code_kw">double</span> fVal = <span class="code_digit">1</span>;
<span class="code_kw_lib">Parser</span> p;
<span class="code_kw_lib">p.DefineVar</span>(<span class="code_str">"a"</span>, &fVal);
<span class="code_kw_lib">p.DefineFun</span>(<span class="code_str">"MySqr"</span>, MySqr);
<span class="code_kw_lib">p.SetExpr</span>(<span class="code_str">"MySqr(a)*_pi+min(10,a)"</span>);
<span class="code_kw">for</span> (std::size_t a=<span class="code_digit">0</span>; a<100; ++a)
{
fVal = a; <span class="code_cmt">// Change value of variable a</span>
std::cout << <span class="code_kw_lib">p.Eval()</span> << std::endl;
}
}
<span class="code_kw">catch</span> (<span class="code_kw_lib">Parser::exception_type</span> &e)
{
std::cout << <span class="code_kw_lib">e.GetMsg()</span> << std::endl;
}
<span class="code_kw">return</span> <span class="code_digit">0</span>;
}
</pre>
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<h2><a id="idBench"></a>Benchmarks</h2>
<p>
Finally, I'd like to give you some benchmarks. The benchmarking was done on an Intel
Pentium P-4 with 2.6 GHz, with a version compiled by using MSVC++ 7.1 (Standard edition).
The diagram shows number of <b>evaluations per seconds vs. expression length</b>.
I compared both the static lib and the dll version with two other parsers that are freely available
on the net, very fast and have a similar set of features. One of them is a commercial product.
</p>
<p>
<img src="images/bench2.jpg" alt="parser benchmarks" border="0" height="489" width="560"/>
</p>
<p>
A higher curve means better performance. Expressions were created randomly. They used only <code>sin</code> and <code>cos</code> functions and contained
multiple variables and constants. In order to smoothen the curves each point represents the value of a
running average over 10 sample expressions.
</p>
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<td>© 2005-2011 Ingo Berg</td>
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