Calling a method of an object?

[Joanna Rutkowska]

Hello, I've created a simple class:

function m = motor (name, Kv, Rm, I0)
        m.name = name;
        m.Kv = Kv;
        m.Rm = Rm;
        m.I0 = I0;
        m = class (m, "motor");
end

...and one simple method:

function power = power_out (motor, u, i)
        power = (u - i*motor.Rm) * (i - motor.I0);
end

... and I created an object of the class motor:

octave:1> m1 = motor ("Sample motor", 400, 0.05, 1);

... but I cannot call the power_out method using the traditional "OO way":

octave:2> m1.power_out (1,1);
error: invalid index for class

... only this form seems to work:

octave:2> power_out (m1, 1, 1);

Is it how this is supposed to be in Octave? The object.method() calling 
convention is much more intuitive and more readable than method(object) 
IMHO. Also, it clearly allows to avoid name conflicts if I got some 
global function or another method with the same name...

Thanks,
joanna.