Why is the lamp color and label not changing according to the if statement?

Hi! :)

I have this code ( see the attached code) within the callback function of one button that I have in my app.

As you can see I am bringing up antall soner from another app.

What I dont understand is why the lamp color and label statement is not changing according to the if statement.

Can anybody help me with my issue?

Answer 1

[Voss]

The lamp and label change inside a while loop. To see the changes as the code runs, you need to add drawnow after setting their properties, which updates the graphics immediately.

Another problem is that osmotisk_verdi is a character vector, so you don't want to be comparing it to numeric values. You can use str2double to make it numeric, but if app.Osmotic_pressure is numeric you can just use that instead (see comments in the code below).

app.zone_now=0;

while app.zone_now<=app.Callingapp.antall_soner
    
    % assuming app.Osmotic_pressure is numeric, then to update the
    % uieditfield, do one of the following:
    
    % if the uieditfield is 'numeric' style, use app.Osmotic_pressure directly:
    app.ComputedosmoticpressureEditField.Value=app.Osmotic_pressure;
    
    % or if the uieditfield is 'text' style, use num2str(app.Osmotic_pressure):
    app.ComputedosmoticpressureEditField.Value=num2str(app.Osmotic_pressure);
    
    % and you can use app.Osmotic_pressure directly in your comparisons:
    if app.Osmotic_pressure <= 30000000
        app.Label.Text='Too low osmotic pressure';
        app.Lamp.Color='red';
    elseif app.Osmotic_pressure < 50000000
        app.Label.Text='Intermediate osmotic presssure';
        app.Lamp.Color=[1 1 0];
    else
        app.Label.Text='Beneficial osmotic pressure';
        app.Lamp.Color=[0 1 0];
    end
    
    % update the GUI:
    drawnow();
    
    app.zone_now=app.zone_now+1;
    
end

[Muazma Ali]

@Voss hi again , is drawnow just available in matlab 2020....?

I tried it , it didnt change the color of the lamp..

[Dyuman Joshi]

Just a note - drawnow has been available since before R2006a.

[Muazma Ali]

@Voss Hi

Am I supposed to use something else together with drawnow as the color has to change inside a while loop.? :)

[Muazma Ali]

@Voss forget it, I had to lamps in my apps and I just realised it :)