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Correctness Test of det_by_minor Routine

Syntax
flag = correct_det_by_minor()

flag
The return value has prototype       bool flag  It value is 1 if the test passes and 0 otherwise.

Source Code
bool correct_det_by_minor(void)
{     double a[9], det, check;

random_seed(123);
uniform_01(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] );

double eps99 = 99.0 * DBL_EPSILON;
if( fabs(det / check - 1.0) < eps99 )
return true;
return false;
}

Input File: test_more/compare_c/det_by_minor.c