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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>time_test: Example and test</title>
<meta http-equiv='Content-Type' content='text/html' charset='utf-8'/>
<meta name="description" id="description" content="time_test: Example and test"/>
<meta name="keywords" id="keywords" content=" time_test example test time time_test: and "/>
<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='_time_test.cpp_xml.js'>
</script>
</head>
<body>
<table><tr>
<td>
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</select>
</td>
<td>
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<option>library-&gt;</option>
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<option>NumericType</option>
<option>CheckNumericType</option>
<option>SimpleVector</option>
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<option>nan</option>
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<option>RombergOne</option>
<option>RombergMul</option>
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</select>
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<option>time_test-&gt;</option>
<option>elapsed_seconds</option>
<option>time_test.cpp</option>
</select>
</td>
<td>time_test.cpp</td>
<td>Headings</td>
</tr></table><br/>







<center><b><big><big>time_test: Example and test</big></big></b></center>
<code><font color="blue"><pre style='display:inline'> 
# include &lt;cppad/time_test.hpp&gt;
# include &lt;cppad/vector.hpp&gt;

namespace { // empty namespace
	using CppAD::vector;

	// size for the test
	size_t size_;

	vector&lt;double&gt; a, b, c;
	void test(size_t repeat)
	{	// setup
		a.resize(size_);
		b.resize(size_);
		c.resize(size_);
		size_t i  = size_;;
		while(i)
		{	--i;
			a[i] = i;
			b[i] = 2 * i;
			c[i] = 0.0;
		}
		// operations we are timing
		while(repeat--)
		{	i = size_;;
			while(i)
			{	--i;
				c[i] += std::sqrt(a[i] * a[i] + b[i] * b[i]);
			}
		}
	}

}
bool time_test(void)
{	bool ok = true;

	// minimum amount of time to run test
	double time_min = 0.5; 

	// size of first test case
	size_ = 20;

	// run the first test case
	double time_first = CppAD::time_test(test, time_min);

	// size of second test case is twice as large
	size_ = 2 * size_;

	// run the second test case
	double time_second = CppAD::time_test(test, time_min);

	// for this case, time should be linear w.r.t size
	double rel_diff = 1. - 2. * time_first / time_second;
	ok             &amp;= (std::fabs(rel_diff) &lt;= .1);
	if( ! ok )
		std::cout &lt;&lt; std::endl &lt;&lt; &quot;rel_diff = &quot; &lt;&lt; rel_diff  &lt;&lt; std::endl;
 
	a.clear();
	b.clear();
	c.clear();
	return ok;
}
</pre>

</font></code>


<hr/>Input File: speed/example/time_test.cpp

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