MATLAB: Problem with sliders and plot (App Designer)

app designerMATLAB and Simulink Student Suite

Hello, I'm using Matlab App Designer and I have a problem. Considering this design:
If a and b are the values on which the sliders alpha and beta are positioned, respectively, I wanted to plot this function:
f(x) = ax + b.
I have been trying a lot changing variables on this code, but with no success. Sometimes beta value doesn't apear and it plots only y = ax… I don't know. This is the code where I'm stuck. 
 % Callbacks that handle component events
    methods (Access = private)
% Value changing function: alfaSlider
        function alfaSliderValueChanging(app, event)
            alfa = event.Value;
            x = 0:0.01:100;
            y = alfa.*x + app.betaSlider.Value;
            plot(app.UIAxes,x,y)
        end
        % Value changing function: betaSlider
        function betaSliderValueChanging(app, event)
           beta = event.Value;
           x = 0:0.01:100;
           y = beta + 0.*x + app.alfaSlider.Value;
           plot(app.UIAxes,x,y)
        end
 .
 .
 .
How could I plot f(x) using a and b as the inputs of the slide bars?
Thanks in advance

Best Answer

I think this is what you mean but let me know if I’m wrong.
     % Callbacks that handle component events
    methods (Access = private)
    % Value changing function: alfaSlider
        function alfaSliderValueChanging(app, event)
            x = 0:0.01:100;
            y = app.alfaSlider.Value*x + app.betaSlider.Value;
            plot(app.UIAxes,x,y)
        end
        % Value changing function: betaSlider
        function betaSliderValueChanging(app, event)
           x = 0:0.01:100;
           y = app.betaSlider.Value + app.alfaSlider.Value*x;
           plot(app.UIAxes,x,y)
        end
You could make this shorter by just having one callback written for both of them (they do the same thing), but that’s not super important for something with a few lines of code.
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