AD Parameter and Variable Functions: Example and Test
Keywords: ad parameter variable functions: example test

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AD Parameter and Variable Functions: Example and Test
`

    # include <cppad/cppad.hpp>

    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;
    	CPPAD_TESTVECTOR(AD<double>) x(n);
    	x[0]     = 0.;
    	ok &= Parameter(x[0]);     // x[0] is a paraemter here
    	CppAD::Independent(x);
    	ok &= Variable(x[0]);      // now x[0] is a variable

    	// dependent variable vector
    	size_t m = 2;
    	CPPAD_TESTVECTOR(AD<double>) y(m);
    	y[0] = 2.;
    	ok  &= Parameter(y[0]);    // y[0] does not depend on x[0]
    	y[1] = abs(x[0]);
    	ok  &= Variable(y[1]);     // y[1] does depends on x[0]

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

    	// create f: x -> y and stop tape recording
    	CppAD::ADFun<double> f(x, y);

    	// check that now all AD<double> objects are parameters
    	ok &= Parameter(x[0]); ok &= ! Variable(x[0]);
    	ok &= Parameter(y[0]); ok &= ! Variable(y[0]);
    	ok &= Parameter(y[1]); ok &= ! Variable(y[1]);

    	// check that the VecAD<double> object is a parameter
    	ok &= Parameter(z);

    	return ok;
    }

`

Input File: example/par_var.cpp