[removed] PI (π) Calculator

Question

Is there a way to calculate pi in Javascript? I know there you can use Math.PI to find pie like this:

var pie = Math.PI;
alert(pie); // output \"3.1         


        

Answer 1

You can approximate the value of π through the use of Monte Carlo simulation. Generate a random X and Y each in the range [-1,1] Then the likelihood (X, Y) is in the unit circle centered at the origin is π/4. More samples yields a better estimate of its value. You can then estimate π by comparing the ratio of samples in the unit circle with the total number of samples and multiply by 4.

this.pi = function(count) {
    var inside = 0;

    for (var i = 0; i < count; i++) {
        var x = random()*2-1;
        var y = random()*2-1;
        if ((x*x + y*y) < 1) {
            inside++
        }
    }

    return 4.0 * inside / count;
}