[R] help with oop in R - class structure and syntex

From: tom soyer <tom.soyer_at_gmail.com>
Date: Tue, 5 Feb 2008 07:21:52 -0600


Hi,

I read section 5, oop, of the R lang doc, and I am still not sure I understand how to build a class in R for oop. I thought that since I understand the oop syntex of Java and VB, I am wondering if the R programmig experts could help me out by comparing and contrasting the oop syntex in R with that of Java. For example, the basic class structure in Java is like this:

public class Bicycle {

    // *the Bicycle class has three fields*     public int cadence;
    public int gear;
    public int speed;

    // *the Bicycle class has one constructor*     public Bicycle(int startCadence, int startSpeed, int startGear) {

        gear = startGear;
        cadence = startCadence;
        speed = startSpeed;

}

    // *the Bicycle class has four methods*     public void setCadence(int newValue) {

        cadence = newValue;
}

    public void setGear(int newValue) {

        gear = newValue;
}

    public void applyBrake(int decrement) {

        speed -= decrement;
}

    public void speedUp(int increment) {

        speed += increment;
}

}

Could one of the R experts please illustrate the R class syntex for writing the R equivalent of the Java Bicycle class above?

Also, in Java, inheritance is done like this:

public class MountainBike extends Bicycle {

    // *the MountainBike subclass has one field*     public int seatHeight;

    // *the MountainBike subclass has one constructor*     public MountainBike(int startHeight, int startCadence, int startSpeed, int startGear) {

        super(startCadence, startSpeed, startGear);
        seatHeight = startHeight;

}

    // *the MountainBike subclass has one method*     public void setHeight(int newValue) {

        seatHeight = newValue;
}

}

What would be the R oop syntex for inheritance in the case of the MontainBike class?

Thanks!

-- 
Tom

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