App Designer: I identified my variables in one function, but it is not carrying over to the next function, so it informs me that my Variable (specifically P1) is undefined.

Hello, I have very little experince in Matlab, especially the app designer. I would love some assistance in solving the problem where I can not transfer over my variables from my StartButtonPushed function to my HitButtonPushed function.

classd

ef V1 < matlab.apps.AppBase

    % Properties that correspond to app components
    properties (Access = public)
        UIFigure          matlab.ui.Figure
        HitButton         matlab.ui.control.Button
        StandButton       matlab.ui.control.Button
        DoubleDownButton  matlab.ui.control.Button
        StartButton       matlab.ui.control.Button
    end

    % Callbacks that handle component events
    methods (Access = private)

        % Button pushed function: StartButton
        function StartButtonPushed(app, event)
P1 = zeros(1,10); %Create a zeros row so that values can be replaced
P2 = zeros(1,10);
H = zeros(1,10);
deck = randperm(52); %Creates a vector of random numbers from 1 to 52 without repeats
P1(1) = deck(1); %Deal player 1 the first card
P2(2) = deck(2); %Deal player 2 the second card
H(1) = deck(3); %Deal house the third card
P1(2) = deck(4);% Deal player 1 the fourth card
P2(2) = deck(5); %Deal player 2 the fifth card
H(2) = deck(6); %Deal house the sixth card

%totalCardsDrawn = length(P1) +length(P2) +length(H)
totalCardsDrawn = nnz(P1) +nnz(P2) + nnz(H);
cardVal_1 = P1(1); %This will take the first card delt to player 1 and assign it a value
switch cardVal_1
    case {1 2 3 4 }
        cardVal_1 = 1;
    case {5 6 7 8}
        cardVal_1 = 2;
    case {9 10 11 12}
        cardVal_1 = 3;
    case {13 14 15 16}
        cardVal_1 = 4;
    case {17 18 19 20}
        cardVal_1 = 5;
    case {21 22 23 24}
        cardVal_1 = 6;
    case {25 26 27 28}
        cardVal_1 = 7;
    case {29 30 31 32}
        cardVal_1 = 8;
    case {33 34 35 36}
        cardVal_1 = 9;
    otherwise 
        cardVal_1 = 10;
end
P1(1) = cardVal_1;

cardVal_2 = P1(2); %This will take the second card delt to player 1 and assign it a value
switch cardVal_2
    case {1 2 3 4 }
        cardVal_2 = 1;
    case {5 6 7 8}
        cardVal_2 = 2;
    case {9 10 11 12}
        cardVal_2 = 3;
    case {13 14 15 16}
        cardVal_2 = 4;
    case {17 18 19 20}
        cardVal_2 = 5;
    case {21 22 23 24}
        cardVal_2 = 6;
    case {25 26 27 28}
        cardVal_2 = 7;
    case {29 30 31 32}
        cardVal_2 = 8;
    case {33 34 35 36}
        cardVal_2 = 9;
    otherwise 
        cardVal_2 = 10 ;  
end
P1(2) = cardVal_2

cardVal_3 = P2(1); %This will take the first card delt to player 2 and give it a value
switch cardVal_3
    case {1 2 3 4 }
        cardVal_3 = 1;
    case {5 6 7 8}
        cardVal_3 = 2;
    case {9 10 11 12}
        cardVal_3 = 3;
    case {13 14 15 16}
        cardVal_3 = 4;
    case {17 18 19 20}
        cardVal_3 = 5;
    case {21 22 23 24}
        cardVal_3 = 6;
    case {25 26 27 28}
        cardVal_3 = 7;
    case {29 30 31 32}
        cardVal_3 = 8;
    case {33 34 35 36}
        cardVal_3 = 9;
    otherwise 
        cardVal_3 = 10 ;  
end
P2(1) = cardVal_3;

cardVal_4 = P2(2); %This will take the second card delt to player 2 and give it a value
switch cardVal_4
    case {1 2 3 4 }
        cardVal_4 = 1;
    case {5 6 7 8}
        cardVal_4 = 2;
    case {9 10 11 12}
        cardVal_4 = 3;
    case {13 14 15 16}
        cardVal_4 = 4;
    case {17 18 19 20}
        cardVal_4 = 5;
    case {21 22 23 24}
        cardVal_4 = 6;
    case {25 26 27 28}
        cardVal_4 = 7;
    case {29 30 31 32}
        cardVal_4 = 8;
    case {33 34 35 36}
        cardVal_4 = 9;
    otherwise 
        cardVal_4 = 10 ;  
end
P2(2) = cardVal_4;
%P2_card = [cardVal_3 cardVal_4]

cardVal_5 = H(1); %This will take the first card delt to the house and give it a value
switch cardVal_5
    case {1 2 3 4 }
        cardVal_5 = 1;
    case {5 6 7 8}
        cardVal_5 = 2;
    case {9 10 11 12}
        cardVal_5 = 3;
    case {13 14 15 16}
        cardVal_5 = 4;
    case {17 18 19 20}
        cardVal_5 = 5;
    case {21 22 23 24}
        cardVal_5 = 6;
    case {25 26 27 28}
        cardVal_5 = 7;
    case {29 30 31 32}
        cardVal_5 = 8;
    case {33 34 35 36}
        cardVal_5 = 9;
    otherwise 
        cardVal_5 = 10 ;  
end
H(1) = cardVal_5;

cardVal_6 = H(2); %This will take the second card delt to the house and give it a value
switch cardVal_6
    case {1 2 3 4 }
        cardVal_6 = 1;
    case {5 6 7 8}
        cardVal_6 = 2;
    case {9 10 11 12}
        cardVal_6 = 3;
    case {13 14 15 16}
        cardVal_6 = 4;
    case {17 18 19 20}
        cardVal_6 = 5;
    case {21 22 23 24}
        cardVal_6 = 6;
    case {25 26 27 28}
        cardVal_6 = 7;
    case {29 30 31 32}
        cardVal_6 = 8;
    case {33 34 35 36}
        cardVal_6 = 9;
    otherwise 
        cardVal_6 = 10 ;  
end
H(2) = cardVal_6;

        end

        % Button pushed function: HitButton
        function HitButtonPushed(app, event)

            totalCardsDrawn = nnz(P1) +nnz(P2) + nnz(H)
            drawCard = deck(totalCardsDrawn+ 1);
    %function addCardVal=casefunc(drawCard)
    switch drawCard
        case {1 2 3 4 }
            addCardVal = 1;
        case {5 6 7 8}
            addCardVal = 2;
        case {9 10 11 12}
            addCardVal = 3;
        case {13 14 15 16}
            addCardVal = 4;
        case {17 18 19 20}
            addCardVal = 5;
        case {21 22 23 24}
            addCardVal = 6;
        case {25 26 27 28}
            addCardVal = 7;
        case {29 30 31 32}
            addCardVal = 8;
        case {33 34 35 36}
            addCardVal = 9;
        otherwise 
            addCardVal = 10 ;  
    end
   lengthP1 = nnz(P1);
            newLength_P1 = lengthP1 +1
        P1(newLength_P1) = addCardVal
        end
    end

    % Component initialization
    methods (Access = private)

        % Create UIFigure and components
        function createComponents(app)

            % Create UIFigure and hide until all components are created
            app.UIFigure = uifigure('Visible', 'off');
            app.UIFigure.Position = [100 100 711 496];
            app.UIFigure.Name = 'UI Figure';

            % Create HitButton
            app.HitButton = uibutton(app.UIFigure, 'push');
            app.HitButton.ButtonPushedFcn = createCallbackFcn(app, @HitButtonPushed, true);
            app.HitButton.Position = [383 120 100 22];
            app.HitButton.Text = 'Hit';

            % Create StandButton
            app.StandButton = uibutton(app.UIFigure, 'push');
            app.StandButton.Position = [497 120 100 22];
            app.StandButton.Text = 'Stand';

            % Create DoubleDownButton
            app.DoubleDownButton = uibutton(app.UIFigure, 'push');
            app.DoubleDownButton.Position = [611 120 100 22];
            app.DoubleDownButton.Text = 'Double Down';

            % Create StartButton
            app.StartButton = uibutton(app.UIFigure, 'push');
            app.StartButton.ButtonPushedFcn = createCallbackFcn(app, @StartButtonPushed, true);
            app.StartButton.Position = [284 289 141 41];
            app.StartButton.Text = 'Start';

            % Show the figure after all components are created
            app.UIFigure.Visible = 'on';
        end
    end

    % App creation and deletion
    methods (Access = public)

        % Construct app
        function app = V1

            % Create UIFigure and components
            createComponents(app)

            % Register the app with App Designer
            registerApp(app, app.UIFigure)

            if nargout == 0
                clear app
            end
        end

        % Code that executes before app deletion
        function delete(app)

            % Delete UIFigure when app is deleted
            delete(app.UIFigure)
        end
    end
end

[Jason Grosser]

I am new to app designer as well and having exactly the same problem. Variables defined in one function are not visible to another function. I want to make all my variables global.

How do I do that???

Answer 1

[Melissa Williams]

Hi,

To make your variables accessible to all functions you need to make them an app property. To do this, in Code View, on the Editor tab of the toolstrip, in the Insert Section, select add Property.

You will see some code like this:

 properties (Access = private)
        Property % Description
 end

Rename "Property" to be the name of your variable and whenever you want to access it, use app.NewPropertyName.

[Danya Pradeep Kumar]

Hi Melissa,

This answer solved the problem I was facing in my app to use variables defined in one function in another. Thank you!

Danya