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<center><b><big><big>AD Parameter and Variable Functions: Example and Test</big></big></b></center>
<code><font color="blue"><pre style='display:inline'> 

# include &lt;cppad/cppad.hpp&gt;

bool ParVar(void)
{	bool ok = true;

	using CppAD::AD;
	using CppAD::VecAD;
	using CppAD::Parameter;
	using CppAD::Variable;

	// declare independent variables and start tape recording
	size_t n = 1;
	<a href="testvector.xml" target="_top">CPPAD_TESTVECTOR</a>(AD&lt;double&gt;) x(n);
	x[0]     = 0.;
	ok &amp;= Parameter(x[0]);     // x[0] is a paraemter here
	CppAD::<a href="independent.xml" target="_top">Independent</a>(x);
	ok &amp;= Variable(x[0]);      // now x[0] is a variable 

	// dependent variable vector
	size_t m = 2;
	<a href="testvector.xml" target="_top">CPPAD_TESTVECTOR</a>(AD&lt;double&gt;) y(m);
	y[0] = 2.;
	ok  &amp;= Parameter(y[0]);    // y[0] does not depend on x[0]
	y[1] = abs(x[0]);
	ok  &amp;= Variable(y[1]);     // y[1] does depends on x[0] 

	// VecAD objects
	VecAD&lt;double&gt; z(2);
	z[0] = 0.;
	z[1] = 1.;
	ok  &amp;= Parameter(z);      // z does not depend on x[0]
	z[x[0]] = 2.;
	ok  &amp;= Variable(z);       // z depends on x[0]
	

	// create f: x -&gt; y and stop tape recording
	CppAD::<a href="funconstruct.xml" target="_top">ADFun</a>&lt;double&gt; f(x, y);

	// check that now all <a href="ad.xml" target="_top">AD</a>&lt;double&gt; objects are parameters
	ok &amp;= Parameter(x[0]); ok &amp;= ! Variable(x[0]);
	ok &amp;= Parameter(y[0]); ok &amp;= ! Variable(y[0]);
	ok &amp;= Parameter(y[1]); ok &amp;= ! Variable(y[1]);

	// check that the VecAD&lt;double&gt; object is a parameter
	ok &amp;= Parameter(z);

	return ok;
}

</pre>

</font></code>


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

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