Documentation for overloading builtin end() class method..?

Question

Bradley Stiritz 2013-6-18

1
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/79443-documentation-for-overloading-builtin-end-class-method

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

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Matt J 2013-6-18

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/79443-documentation-for-overloading-builtin-end-class-method#answer_89221

在 MATLAB Online 中打开

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)