Method sign

MathParser/src/com/aghajari/math/Functions.java:322–324

(double a)

    }

    public static double sign(double a) {
        return Double.compare(a, 0);
    }

    public static double IF(MathParser parser, String condition, String a, String b) throws MathParserException {
        condition = Utils.realTrim(condition);