Displaying the result of a pushbutton command in AppDesigner

Hello MATLAB Community,

I am trying to use the App Designer so that when I click the blue push button (this generates a random value), that randomly generated value will be displayed in the numeric edit field below.

Below I have what I tried: When the push button is clicked, a random value is generated.

The display(myfluor) displays the value in the command window but not the GUI. I attempted to assign the Value of the numeric edit field to the random variable but when the program is run, the field does not change. Any suggestions would be greatly appreciated, thank you!

        % Button pushed function: 
        % RandomFluorescenceValueGeneratorButton
        function RandomFluorescenceValueGeneratorButtonPushed(app, event)
            a = 0; %min fluorescence
            b = 1600; %max fluorescence
            r = (b-a).*rand(1600,1) + a; %random vector of values generated from range a to b
            myfluor = (randi(length(r))); %picking a random value in vector r to be the fluorescence value
            display(myfluor)   
        end

        % Value changed function: FluorescenceEditField
        function FluorescenceEditFieldValueChanged(app, event)
            app.FluorescenceEditField.Value = myfluor;
        end

Answer 1

[Geoff Hayes]

Tiffany - in your pushbutton callback

function RandomFluorescenceValueGeneratorButtonPushed(app, event)
    a = 0; %min fluorescence
    b = 1600; %max fluorescence
    r = (b-a).*rand(1600,1) + a; %random vector of values generated from range a to b
    myfluor = (randi(length(r))); %picking a random value in vector r to be the fluorescence value
    display(myfluor)   
end

the display(myfluor) is responsible for what you see in the command window. If you want to populate the edit control, you would need to add a line to do that

        % Button pushed function: 
        % RandomFluorescenceValueGeneratorButton
        function RandomFluorescenceValueGeneratorButtonPushed(app, event)
            a = 0; %min fluorescence
            b = 1600; %max fluorescence
            r = (b-a).*rand(1600,1) + a; %random vector of values generated from range a to b
            myfluor = (randi(length(r))); %picking a random value in vector r to be the fluorescence value
            display(myfluor);
            app.FluorescenceEditField.Value = myfluor;
        end
        % Value changed function: FluorescenceEditField
        function FluorescenceEditFieldValueChanged(app, event)
            % nothing needed here
        end

Note that I just moved the line from the FluorescenceEditFieldValueChanged to the button callback. The FluorescenceEditFieldValueChanged would be called when you make a change (via the GUI) to this field which is not what is happening here.

[TYT]

Thank you very much! What belongs in which function makes sense now, thanks again.