isa probability distribution?

2017 11 1
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How can I check whether variables are probability distributions made by makedist? For example:
x(1) = makedist('Gamma');
x(2) = makedist('Normal');
x(3) = makedist('Exponential');
I want a function like
isa(x(i),'probdist')
that returns true for all three x's. As I understand it, isa would work if these distributions all had a common parent, e.g. called 'probdist', but I can't find any such common parent.
Thanks for any suggestions...

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Eric
Eric 2017-11-1

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By using
>> whos
I was able to determine that x's class is a "prob.ToolboxFittableParametricDistribution" object, such that
for i=1:3
isa(x(i),'prob.ToolboxFittableParametricDistribution')
end
returns true for all three x's.

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