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Help with numerical methods project java code (trapezoidal rule)
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Posted: Dec 3, 2014 11:26 PM
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Hi guys. Need help...
I tried running the code for trapezoidal rule. It's my project in Numerical Methods, here's the code:
static double trapezoidRule (int size, double[] x, double[] y)
{ double sum = 0.0,
increment;
for ( int k = 1; k < size; k++ )
{//Trapezoid rule: 1/2 h * (f0 + f1)
increment = 0.5 * (x[k]-x[k-1]) * (y[k]+y[k-1]);
sum += increment;
}
return sum;
}
public static void main ( String[] args ) throws Exception
{ String fileName = args.length > 0 ? args[0] : "InpData.txt";
Scanner inp = new Scanner(new File(fileName));
int k, size;
double[] x, y;
double integral;
size = inp.nextInt();
System.out.println ("Number of points: " + size);
x = new double[size];
y = new double[size];
for ( k = 0; k < size; k++ )
{ x[k] = inp.nextDouble();
y[k] = inp.nextDouble();
}
integral = trapezoidRule (size, x, y);
System.out.printf ("Integral: %4.4f\n", integral);
System.out.printf ("Check: log(%2.2f) = %8.8f\n",
x[size-1], Math.log(x[size-1]) );
}
}
It cannot be compiled and I always get FileNotFoundException. Any thoughts? Please help. Thanks!
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