How do I make a list of objects that have specific properties?

Question

William Kozicki 2017-8-3

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https://ww2.mathworks.cn/matlabcentral/answers/351483-how-do-i-make-a-list-of-objects-that-have-specific-properties

编辑： per isakson 2017-8-4

Hello. I'm trying to make this program for a homebrewed D&D thing for fun but am having some difficulties. I feel like I am woefully under informed about classes and how to use them.

I've defined a class for Ingredients

classdef Ingredient
      properties
          Rarity;
          Location;
          Easy;
          Medium;
          Hard;
          VeryHard;
          Weight;
          Passive;
      end
      methods 
      end
  end

What I want to be able to do is (after creating all of my ingredients) search for all ingredients of a specific location(s).

I understand this is a relatively simple question. Is there something I have to do when I create my objects? I am going about this in a way that makes any sense?

Thanks.

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Answer 1

Image Analyst 2017-8-3

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What about strcmp() in a simple for loop. Assuming you have your array of ingredient objects:

for k = 1 : length(allIngredients)
    if strcmp(allIngredients(k).Location, 'pantry')
        message = sprintf('The location of ingredient #%d is your pantry', k);
        uiwait(helpdlg(message));
    end
end

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William Kozicki 2017-8-3

Yep, that is pretty much what I was looking for. Thanks!

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Answer 2

per isakson 2017-8-4

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https://ww2.mathworks.cn/matlabcentral/answers/351483-how-do-i-make-a-list-of-objects-that-have-specific-properties#answer_276722

编辑：per isakson 2017-8-4

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An alternate approach

%%Create some data
loc = randi( [double('A'),double('D')], 1,8 );
loc_str = arrayfun( @char, loc, 'uni',false );
loc_num = num2cell(loc);
%
%%Create an array of objects
allIngredients(1,8) = Ingredient;           % preallocate an array of objects
[allIngredients.Location] = loc_str{:};     % assign some values
[allIngredients.Rarity]   = loc_num{:};
%
%%Search for all ingredients with location equal to 'A'.
isA = strcmp( {allIngredients.Location}, 'A' );
allIngredients(isA).Rarity