[Changeset] ismethod and subsindex functions

[David Bateman]

In my effort to look at documenting, and testing at the same time, the 
new OOP fetaures, here is a patch that adds the subsindex and ismethod 
functions. The subsindex function allows the conversion of a class 
object into a valid index vector for use in indexing expressions. That 
is something like

a  = myclass (1:4);
b = 1:10;
c = b (a)

the conversion of a to an index of b is handled by the subsindex method 
of the class. Note that Mathworks, in their wisdom or lack there of, 
decided that subsindex should be a zero-based index where indexing 
everywhere else in the matlab language is ones-based!!!!! And so 
subsindex must return a zero-based index vector of the class double/logical.

The ismethod function is just the same function as in matlab as I 
implemented as it was easy enough to add.

Note that I'm seeing some strange things with this patch in the same 
manner as I saw previously for the thread

http://www.nabble.com/Another-OOP-issue-to19638982.html

That is

a  = myclass (1:4);
b = 1:10;
c = b (a)

works, but then an additional call to "b(a)" results in the subsindex 
method not being found and the default method being found instead. This 
seems to be a generic issue with the OOP code. However, it is also 
independent of this patch and so perhaps this patch should be applied in 
any case. I believe that with the addition of the subsindex method and 
the vertcat/horzcat overloading in [] that all of the operator 
overloading capabilities are now in place.

Regards
David

-- 
David Bateman                                David.Bateman at motorola.com
Motorola Labs - Paris                        +33 1 69 35 48 04 (Ph) 
Parc Les Algorithmes, Commune de St Aubin    +33 6 72 01 06 33 (Mob) 
91193 Gif-Sur-Yvette FRANCE                  +33 1 69 35 77 01 (Fax) 

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