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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>Correctness Test of det_by_minor Routine</title>
<meta http-equiv='Content-Type' content='text/html' charset='utf-8'/>
<meta name="description" id="description" content="Correctness Test of det_by_minor Routine"/>
<meta name="keywords" id="keywords" content=" correctness test of det_by_minor routine syntax flag source code "/>
<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='_correct_det_by_minor_c_xml.js'>
</script>
</head>
<body>
<table><tr>
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<center><b><big><big>Correctness Test of det_by_minor Routine</big></big></b></center>
<br/>
<b><big><a name="Syntax" id="Syntax">Syntax</a></big></b>

<br/>

<code><i><font color="black"><span style='white-space: nowrap'>flag</span></font></i><font color="blue"><span style='white-space: nowrap'>&#xA0;=&#xA0;correct_det_by_minor()</span></font></code>


<br/>
<br/>
<b><big><a name="flag" id="flag">flag</a></big></b>
<br/>
The return value has prototype

<code><font color="blue"><span style='white-space: nowrap'><br/>
&#xA0;&#xA0;&#xA0;&#xA0;&#xA0;bool&#xA0;</span></font><i><font color="black"><span style='white-space: nowrap'>flag</span></font></i><font color="blue"><span style='white-space: nowrap'><br/>
</span></font></code>
It value is <code><font color="blue">1</font></code> if the test passes and <code><font color="blue">0</font></code> otherwise.




<br/>
<br/>
<b><big><a name="Source Code" id="Source Code">Source Code</a></big></b>

<code><font color='blue'><pre style='display:inline'> 
bool correct_det_by_minor(void)
{	double a[9], det, check;

	<a href="uniform_01_c.xml" target="_top">random_seed</a>(123);
	<a href="uniform_01_c.xml" target="_top">uniform_01</a>(9, a);

	/* compute determinant using expansion by minors */
	det = det_by_minor(a, 3);
	
	/* use expansion by minors to hand code the determinant  */
	check = 0.;
	check += a[0] * ( a[4] * a[8] - a[5] * a[7] );
	check -= a[1] * ( a[3] * a[8] - a[5] * a[6] );
	check += a[2] * ( a[3] * a[7] - a[4] * a[6] );

	if( fabs(det / check - 1.0) &lt; 1e-10 )
		return true;
	return false;
}
</pre></font></code>


<hr/>Input File: compare_c/det_by_minor.c

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