Problem using polyval/polyfit in App Designer R2022b

Question

Florian 2023-8-22

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2011297-problem-using-polyval-polyfit-in-app-designer-r2022b

评论： Florian 2023-8-23

采纳的回答： Daniele Sportillo

Hello i want to display a set of Input Data and Plot it.

After that i want to use polyfit/polyval on that Data and plot it also.

Some how this does not work in my App using App Designer ( in normal Matlab skript it worked)

here is an example code of it:

I used some Editfield to get diffrent Inputs

properties (Access = private)

Property % Description

Data

Range

PolyNom

function1

end

% Callbacks that handle component events

methods (Access = private)

% Button pushed function: DisplayButton

function DisplayButtonPushed(app, event)

app.Data = [app.EditField.Value,app.EditField2.Value,app.EditField3.Value,app.EditField4.Value,app.EditField5.Value,app.EditField6.Value]

app.Range = 1:length(app.Data)

app.Range = app.Range';

plot(app.UIAxes, app.Data,'o')

hold(app.UIAxes);

end

% Button down function: UIAxes

function UIAxesButtonDown(app, event)

app.PolyNom = polyfit(app.Range,app.Data,2);

app.function1 = polyval(app.PolyNom, app.Range);

plot(app.UIAxes2, app.function1);

I watched some Videos and they basicly do the same and it works, is this maybe a Version problem?

Thank you!

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Answer 1

Daniele Sportillo 2023-8-22

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https://ww2.mathworks.cn/matlabcentral/answers/2011297-problem-using-polyval-polyfit-in-app-designer-r2022b#answer_1291312

Hi Florian,

are you using the Edit Filed (Numeric) Component, and not the Edit Field (Text), in your App?

Otherwise in app.Data you would be concatenating characters ['123456'] and not numbers [1,2,3,4,5,6].

Daniele

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Florian 2023-8-22

在 MATLAB Online 中打开

If i do it like you and use only one button and put it all in one function it works for me aswell now. But i used a second button (poly) here to plot the polynom in the same fig and this doesnt work.

    
    properties (Access = private)
        Property % Description
        Data    
        Range
        PolyNom
        function1
    end
    
    % Callbacks that handle component events
    methods (Access = private)
        % Button pushed function: DisplayButton
        function DisplayButtonPushed(app, event)
            app.Data = [app.EditField.Value,app.EditField2.Value,app.EditField3.Value,app.EditField4.Value,app.EditField5.Value,app.EditField6.Value]
            app.Range = 1:length(app.Data)
            app.Range = app.Range';
            plot(app.UIAxes, app.Data,'o')
            hold(app.UIAxes);  
%             app.PolyNom = polyfit(app.Range,app.Data,3); 
%             app.function1 = polyval(app.PolyNom, app.Range);
%             
%             plot(app.UIAxes, app.function1);
        end
        % Button down function: UIAxes
        function UIAxesButtonDown(app, event)
            app.PolyNom = polyfit(app.Range,app.Data,3); 
            app.function1 = polyval(app.PolyNom, app.Range);
            
            plot(app.UIAxes, app.function1);
        end
    end

Daniele Sportillo 2023-8-22

在 MATLAB Online 中打开

According to your code:

function UIAxesButtonDown(app, event)
    app.PolyNom = polyfit(app.Range,app.Data,3); 
    app.function1 = polyval(app.PolyNom, app.Range);
    
    plot(app.UIAxes, app.function1);
end

you are plotting the polyval when you click on the axes, not when you click on the second button (poly).

If you want to plot the polyval when you click on your button (poly) you have to add that code to the ***ButtonPushed callback for your button.

Florian 2023-8-23

of course... now it works thanks! i will check my "real" skript if there is the same silly mistake.

Thank you so much

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