Using Math.pow() function

Question

I'm trying to make a program in Java to calculate the formula for the Ricker wavelet:

But the results are not matching to the real ones.

This is what I'm using:

private static double rickerWavelet(double t, double f){

   double p = (Math.pow(Math.PI, 2))*(Math.pow(f, 2))*(Math.pow(t, 2));

   double lnRicker = 1 - (2 * p) * Math.exp(-p);

   return lnRicker;
}

Am I using the Math functions wrongly?

Answer 1

To match the formula,

double lnRicker = 1 - (2 * p) * Math.exp(-p);

needs to be

double lnRicker = (1 - (2 * p)) * Math.exp(-p);

Since * has higher operator precedence than -, in your expression the multiplication of (2 * p) with Math.exp(-p) will be done first, which is not what you want.