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<?xml version='1.0'?>
<html xmlns='http://www.w3.org/1999/xhtml'
      xmlns:math='http://www.w3.org/1998/Math/MathML'
>
<head>
<title>ADFun Checking For Nan: Example and Test</title>
<meta http-equiv='Content-Type' content='text/html' charset='utf-8'/>
<meta name="description" id="description" content="ADFun Checking For Nan: Example and Test"/>
<meta name="keywords" id="keywords" content=" adfun checking for nan: example and test check_for_nan "/>
<style type='text/css'>
body { color : black }
body { background-color : white }
A:link { color : blue }
A:visited { color : purple }
A:active { color : purple }
</style>
<script type='text/javascript' language='JavaScript' src='_check_for_nan.cpp_xml.js'>
</script>
</head>
<body>
<table><tr>
<td>
<a href="http://www.coin-or.org/CppAD/" target="_top"><img border="0" src="_image.gif"/></a>
</td>
<td><a href="check_for_nan.xml" target="_top">Prev</a>
</td><td><a href="preprocessor.xml" target="_top">Next</a>
</td><td>
<select onchange='choose_across0(this)'>
<option>Index-&gt;</option>
<option>contents</option>
<option>reference</option>
<option>index</option>
<option>search</option>
<option>external</option>
</select>
</td>
<td>
<select onchange='choose_up0(this)'>
<option>Up-&gt;</option>
<option>CppAD</option>
<option>ADFun</option>
<option>check_for_nan</option>
<option>check_for_nan.cpp</option>
</select>
</td>
<td>
<select onchange='choose_down3(this)'>
<option>CppAD-&gt;</option>
<option>Install</option>
<option>Introduction</option>
<option>AD</option>
<option>ADFun</option>
<option>preprocessor</option>
<option>multi_thread</option>
<option>library</option>
<option>ipopt_solve</option>
<option>Example</option>
<option>speed</option>
<option>Appendix</option>
</select>
</td>
<td>
<select onchange='choose_down2(this)'>
<option>ADFun-&gt;</option>
<option>Independent</option>
<option>FunConstruct</option>
<option>Dependent</option>
<option>abort_recording</option>
<option>seq_property</option>
<option>FunEval</option>
<option>Drivers</option>
<option>FunCheck</option>
<option>optimize</option>
<option>check_for_nan</option>
</select>
</td>
<td>
<select onchange='choose_down1(this)'>
<option>check_for_nan-&gt;</option>
<option>check_for_nan.cpp</option>
</select>
</td>
<td>check_for_nan.cpp</td>
<td>Headings</td>
</tr></table><br/>


<center><b><big><big>ADFun Checking For Nan: Example and Test</big></big></b></center>
<code><font color="blue"><pre style='display:inline'> 
# include &lt;cppad/cppad.hpp&gt;

namespace {
	void myhandler(
		bool known       ,
		int  line        ,
		const char *file ,
		const char *exp  ,
		const char *msg  )
	{	// error handler must not return, so throw an exception
		throw std::string(&quot;myhandler&quot;);
	}
}

bool check_for_nan(void)
{	bool ok = true;
	using CppAD::AD;

	// replace the default CppAD error handler
	CppAD::ErrorHandler info(myhandler);

	<a href="testvector.xml" target="_top">CPPAD_TESTVECTOR</a>(AD&lt;double&gt;) ax(2), ay(2);
	ax[0] = 0.0;
	ax[1] = 1.0;
	CppAD::<a href="independent.xml" target="_top">Independent</a>(ax);
	ay    = ax;
	CppAD::<a href="funconstruct.xml" target="_top">ADFun</a>&lt;double&gt; f(ax, ay);

	<a href="testvector.xml" target="_top">CPPAD_TESTVECTOR</a>(double) x(2), y(2);
	x[0] = 2.0;
	x[1] = CppAD::nan(0.0);

	// use try / catch because this causes an exception
	// (assuming that NDEBUG is not defined)
	f.check_for_nan(true);
	try {
		y = f.<a href="forward.xml" target="_top">Forward</a>(0, x);

		// should never reach here
		ok = false;
	}
	catch(std::string msg)
	{	ok &amp;= msg == &quot;myhandler&quot;;
	} 

	// now do calculation without an exception
	f.check_for_nan(false);
	y = f.<a href="forward.xml" target="_top">Forward</a>(0, x);
	ok &amp;= y[0] == x[0];
	ok &amp;= CppAD::isnan( y[1] ); 
	
	return ok;
}

</pre>

</font></code>


<hr/>Input File: example/check_for_nan.cpp

</body>
</html>