FactFunction.java

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package com.graphbuilder.math.func;

public class FactFunction implements Function {

    public FactFunction() {}

    public double of(double[] d, int numParam) {
        int n = (int) d[0];

        double result = 1;

        for (int i = n; i > 1; i--)
            result *= i;

        return result;
    }

    public boolean acceptNumParam(int numParam) {
        return numParam == 1;
    }

    public String toString() {
        return "fact(n)";
    }
}