Question

我正在尝试创建一个具有shuffle和deal方法的'Deck'类，但是，我不知道为什么我的'shuffle'函数没有运行。我收到错误消息：

未定义的函数或方法'shuffle'表示'cell'类型的输入参数。

有人可以解释为什么函数没有运行？非常感谢你。我正在调用之前创建的classdef'Card'

 classdef Deck < handle;
 properties;
     diamond;
     spade
     heart;
     club;


    end;
     methods;
       function obj=create(deck);
         for k=1:13;
             %Designate a number to each suit to create the deck
             obj(k).diamond=cards('D','R',k);
             obj(k).spade=cards('S','B',k);
             obj(k).heart=cards('H','R',k);
            obj(k).club=cards('C','B',k);
         end
         %Create a vector of each suit and number accordingly until we
         %have 52 cards. 13 of each suit.
         obj={obj.diamond obj.spade obj.heart obj.club};            

     end

     %%
     function obj=shuffle(obj);

             shuff=randperm(52);

         for k=1:52;  
             hf=shuff(k);
             obj(k)=obj(hf);


         end
         end

     end
   end

Answer 1

您不需要构造函数中的最后一行：

obj = { obj.diamond obj.spade obj.heart obj.club }

此行将您的对象转换为单元格（？）。尝试删除此行。试试这个classdef而不是

classdef Deck 
     properties 
          cards
     end
 methods
     function obj = Deck()
          % do your stuff here, but no obj. before diamond/spade/heart/club
          obj.cards = { diamond, spade, heart, club };
     end 
     function obj  =shuffle ( obj )
          obj.cards = obj.cards( randperm(52) );
     end
 end

Answer 2

我认为您希望拥有一个Card个对象数组的属性。请参阅MATLAB documentation for object arrays。这是我如何解决这个问题：

classdef Deck < handle
    properties
        % This will be an object array of Card objects.
        CardArray
    end

    properties (Dependent)
        nCards
    end

    methods 
        function This = Deck()
            % preallocate arrays.
            % the constructor for Card should accept 0 arguments.
            Diamond(13) = Card('D', 'R', 13);
            Spade(13) = Card('S', 'B', 13);
            Heart(13) = Card('H', 'R', 13);
            Club(13) = Card('C', 'B', 13);

            % now fill in the rest of each suit
            for iVal = 1:12
                Diamond(iVal) = Card('D', 'R', iVal);
                Spade(iVal) = Card('S', 'B', iVal); 
                Heart(iVal) = Card('H', 'R', iVal); 
                Club(iVal) = Card('C', 'B', iVal);  
            end

            % finally concatenate them into a single array
            This.CardArray = [Diamond, Spade, Heart, Club];
        end

        function shuffle(This) 
            This.CardArray = This.CardArray(randperm(This.nCards)); 
        end

        function n = get.nCards(This)
            n = length(This.CardArray);
        end
    end
end

您需要确保Card构造函数接受零参数。例如，您可以执行以下操作：

classdef Card < handle

    properties
        symbol = 'D'
        color = 'R'
        value = 1;
    end

    methods
        function This = Card(varargin)
            if nargin >= 1
                This.symbol = varargin{1};
            end
            if nargin >= 2
                This.color = varargin{2};
            end
            if nargin >= 3
                This.value = varargin{3};
            end
        end

    end

end

未定义的函数或方法'shuffle'用于'cell'类型的输入参数

2 个答案: