SignFunction.java

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package com.graphbuilder.math.func;

public class SignFunction implements Function {

    public SignFunction() {}

    public double of(double[] d, int numParam) {
        if (d[0] > 0) return 1;
        if (d[0] < 0) return -1;
        return 0;
    }

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

    public String toString() {
        return "sign(x)";
    }
}