How to detect the 'end' directive in subsref?
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Alex Kashuba
le 30 Jan 2020
Commenté : Alex Kashuba
le 30 Jan 2020
Hi all!
I am trying to reimplement the indexing of the object. Let us take as an example this primitive class that return the substript
classdef buffer
function value = subsref(obj, S)
value = S(1).subs{1};
end
end
Let's create object
buf=buffer()
Then buf(7) returns 7. buf(3:7) returns [3 4 5 6 7]. All good so far. Then buf(:) returns char ':'. Ok, can process that. Now comes the funny part:
buf(end) returns 1
buf(end+1) returns 2
buf(1:end) returns 1
buf(2:end) returns []
Question: is there a workaround so that 'end' is not always equivalent of 1, but I would be able to add my own implementation?
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Steven Lord
le 30 Jan 2020
The reason end was always taking the value 1 is probably because your object is a scalar (size [1 1]) that internally contains an array. Consider overloading size to return the size of that internal array if appropriate.
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