Set size of array in object through input?

Question

Michael Simonovski 2018-6-28

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https://ww2.mathworks.cn/matlabcentral/answers/407950-set-size-of-array-in-object-through-input

回答： Guillaume 2018-6-28

Hello,

i want to write a script with an object. One of the private properties should be an array. Its size should not be knew at the start of the script. During the run a function should ask the user to enter an integer. This integer should be the size of this 1D-array with the size.

How it could be implemented?

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Answer 1

Guillaume 2018-6-28

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https://ww2.mathworks.cn/matlabcentral/answers/407950-set-size-of-array-in-object-through-input#answer_326728

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classdef SomeClass
   properties (SetAccess = private)
      Array = [];
   end
   methods
      function this = SetArraySize(this)
         sz = input('What size should the array be ? ');
         validateattributes(sz, {'numeric'}, {'integer', 'positive', 'scalar'})
         this.Array = zeros(1, sz);
      end
   end
end
%usage
obj = SomeClass       %object with empty array
obj = obj.SetArraySize   %prompts for array size