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Asked by Brad Stiritz
on 18 Jun 2013

Hi everyone,

I need to find official documentation / examples for overloading the builtin classdef 'end' method. I have an example in my code base which I got from somewhere a couple of years ago, but unfortunately I didn't document where I got the code from! Here's a correctly-working method from one of my classdefs:

methods function outIndex = end(obj,~,~) outIndex = obj.Nvalues; assert(outIndex>0,'Invalid use of method end() for empty vector'); end end

I'm looking for a URL or two please that documents what those two trailing arguments refer to..? I can't seem to locate anything via Google or the R2013a Help Window.

Thanks, Brad

Answer by Matt J
on 18 Jun 2013

Accepted answer

The information you're requesting is in "doc end", available from the command line. To quote,

*You can overload the end statement for a user object by defining an end method for the object. The end method should have the calling sequence end(obj,k,n), where obj is the user object, k is the index in the expression where the end syntax is used, and n is the total number of indices in the expression. For example, consider the expression*

A(end-1,:)

*The MATLAB software calls the end method defined for A using the syntax*

end(A,1,2)

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