Manipulating data from a table in app designer

Question

sebastian marin quiceno 2023-10-7

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2030544-manipulating-data-from-a-table-in-app-designer

评论： Voss 2023-10-8

Greetings everyone, my fundamental objective is to take the data from an app designer table and then use it. For example, add the data in position (1,1) with the data in position (1,2). But when I take them with the get(table, "Data") function and then use the str2double() function to supposedly convert the data type. When I use the disp() function in the command window I get "NaN".

When I write, for example, "2" and click Button. Spaces are formed in the table to write 2x5. That's where I type the numbers and then I want to try to access them through Button2.

function ButtonPushed(app, event)
            global n;
            global tabla;
            n =1:5;
            tabla = table;
            for i = 1:app.EditField.Value
                for j = n
                    tabla{i,j}=" ";
                end
            end
            app.UITable.Data = tabla;
        end
        % Button pushed function: Button2
        function Button2Pushed(app, event)
           se = get(app.UITable,"Data");
           si=str2double(se);
           disp(si)
        end

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Answer 1

Voss 2023-10-8

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https://ww2.mathworks.cn/matlabcentral/answers/2030544-manipulating-data-from-a-table-in-app-designer#answer_1328689

在 MATLAB Online 中打开

tabla = table;
% ...
app.UITable.Data = tabla;

The uitable's Data is a table variable, so you need to get the data out of the table variable before doing str2double in Button2Pushed:

se = get(app.UITable,"Data");
si=str2double(se{:,:});

For example:

tabla = table("1","2") % a table variable
tabla = 1×2 table
    Var1    Var2
    ____    ____

    "1"     "2" 
str2double(tabla)      % NaN
ans = NaN
str2double(tabla{:,:}) % the contents of the table variable, [1 2]
ans = 1×2
     1     2

Reference: https://www.mathworks.com/help/matlab/matlab_prog/access-data-in-a-table.html

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sebastian marin quiceno 2023-10-8

Thanks a lot!

Voss 2023-10-8

You're welcome!

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Answer 2

Walter Roberson 2023-10-8

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2030544-manipulating-data-from-a-table-in-app-designer#answer_1328649

在 MATLAB Online 中打开

Yes?

You are setting the fields to the blank string. str2double() of the blank string is NaN.

str2double(" ")
ans = NaN

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sebastian marin quiceno 2023-10-8

It's true, you're right, I needed to detail the problem better. When I write, for example, "2" and click Button. Spaces are formed in the table to write 2x5. That's where I type the numbers and then I want to try to access them through Button2.

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