Method derivative

MathParser/src/com/aghajari/math/Functions.java:222–231

(MathParser parser, String variableName, String exp, double x)

    }

    public static double derivative(MathParser parser, String variableName, String exp, double x) throws MathParserException {
        if (!Utils.isIdentifier(variableName))
            throw new MathInvalidParameterException("derivative(): invalid variable name (" + variableName + ")");

        MathParser newParser = parser.clone();
        newParser.setRoundEnabled(false);
        newParser.addVariable(variableName, 0, 0);
        MathParser.MathVariable variable = newParser.getVariable(variableName);
        return Derivative.getDerivative(new FunctionWrapper(newParser, exp, variable), x);
    }

    public static double intg(MathParser parser, String variableName, String exp, double lowerLimit, double upperLimit) throws MathParserException {
        return integral(parser, variableName, exp, lowerLimit, upperLimit, 20);