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<title>Determinant Using Expansion by Minors: Example and Test</title>
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<center><b><big><big>Determinant Using Expansion by Minors: Example and Test</big></big></b></center>
<code><font color="blue"><pre style='display:inline'> 

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

bool det_by_minor()
{	bool ok = true;

	// dimension of the matrix
	size_t n = 3;

	// construct the determinat object
	CppAD::det_by_minor&lt;double&gt; Det(n);

	double  a[] = {
		1., 2., 3.,  // a[0] a[1] a[2]
		3., 2., 1.,  // a[3] a[4] a[5]
		2., 1., 2.   // a[6] a[7] a[8]
	};
	<a href="testvector.xml" target="_top">CPPAD_TESTVECTOR</a>(double) A(9);
	size_t i;
	for(i = 0; i &lt; 9; i++)
		A[i] = a[i];


	// evaluate the determinant
	double det = Det(A);

	double check;
	check = a[0]*(a[4]*a[8] - a[5]*a[7])
	      - a[1]*(a[3]*a[8] - a[5]*a[6])
	      + a[2]*(a[3]*a[7] - a[4]*a[6]);

	ok = det == check;

	return ok;
}

</pre>

</font></code>


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

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