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Indexing a matrix that's not in the workspace

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Matthew Calvin
Matthew Calvin on 31 Jul 2019
Answered: TADA on 31 Jul 2019
I'm reading through someone else's code and trying to understand it. One thing it would be very helpful to be able to do is to be able to see what entries are in specific places in certain matrixes without having to name them. So for example their code might have at some point:
[1,2,3,4]
What I'd like to be able to do in the Command Window is:
>> [1,2,3,4](3)
ans =
3
but the code as written doesn't work. Is there a way to do this other than naming the variable and then checking the position?

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Accepted Answer

TADA
TADA on 31 Jul 2019
you can write a utility function to do that
function value = debugPrint(a, i)
value = a(i);
end
%% or using an anonymous function:
debugPrint = @(a,i) a(i);
now you can call it like that:
debugPrint([1,2,3,4], 3)
ans =
3
or use the builtin indexing function subsref for that:
subsref([1,2,3,4], substruct('()', {3}))

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