[Changeset] ismethod and subsindex functions

[John W. Eaton]

On 26-Sep-2008, David Bateman wrote:

| 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.

Thanks, I applied this changeset.

| 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.

OK, I'll try to take a look at this problem.

jwe