adding property dynamically in the class

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Gopalakrishnan venkatesan 2017-2-23

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评论： Arun Aiyer 2022-7-16

I have a class,

classdef data < dynamicprops
  properties
    result1 = []
    result2 = []
  end
end

Now I need to add dynamically many properites to the class. For example

reult 3, result 4, result 5 etc

I tried using data.('result3') = [] like how we add a field in the strcture. But i am getting the error.

how can i do this?

Thanks a lot

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Adam 2017-2-23

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Why wouldn't you just use a single property

results

as an array of results that you can index into?

Stephen23 2017-2-23

@Gopalakrishnan venkatesan: as Adam already said, using an array (possible cell array) would be a much better solution. You should really consider using the simpler solution rather than making this complicated with dynamic properties.

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Answer 1

Guillaume 2017-2-23

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A rule in any programming language: if you*re numbering variables, you're doing it wrong. These obviously related variables should all be just one variable, a container for whatever is in each of these variables. In matlab, it's matrix or cell array or table.

Assuming your results are going to be matrices of varying size, then:

classdef data < handle
    properties
       results = {[], []};  %two empty results in the results container
    end
    methods
       function addresult(this, result)
           this.results = [this.results, {result}];
       end
       function setnthresult(this, n, result)
           validateattributes(n, {'numeric'}, {'integer', 'positive', '<=', numel(this.results)});
           this.results{n} = result;
       end
    end
end

would make your life much easier.

If you really insist on using dynamic properties, then this page explains exactly how to do it, with example.

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Answer 2

Adam 2017-2-23

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编辑：Adam 2017-2-23

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doc dynamicprops

gives details on the addprops function which I would assume you need to use. I have never wanted to do any dynamic properties on my own classes as it seems a bit of a suspicious design premise, but how did you manage to come across knowing you need to use dynamicprops yet not find addprops?!

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Gopalakrishnan venkatesan 2017-2-23

i known the addprops also but i dont known how to apply it. I was not able to add a new property to my class

Arun Aiyer 2022-7-16

If you want to use inspect function to create a dynamic settings table related to hardware for example.

The inspect function creates a dynamic interface for the object handle properties, which needs to be changed. The function that creates the dynamic props is to generate these settings objects.

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