How to display nothing on textbox after pressing pushbutton if no image is loaded on axes ? GUI

I am doing a project on image classification in which there are 2 pushbuttons(one for loading images in axes and another for classifying that image and produce output on textbox),1 axes and 1 statictext box .The problem that i am facing is that even if i dont upload an image in axes and press the classify button , it still gives an output in textbox.So how to set a condition that if an image is not uploaded then the textbox remains blank after pressing the classify button.

 pred_th=max(b);
 F = get(handles.axes1);
 if isempty(F)
    set(handles.text3,'String','')

 else if(pred_th >=3.2)
 accuracy = mean(diag(confMat))
  textLabel1=sprintf('%s (accuaracy = %f) ',predictedLabels1,accuracy);
  set(handles.text3,'string',textLabel1)
  else
    textLabel2=sprintf('image dont match');
    set(handles.text3,'string',textLabel2)
  end
end

Answer 1

[Santhana Raj]

Two options:

One you can disable the classification button, until the image is loaded. Make is disabled by default and then enable it after you load the image.

Two, Set a flag variable when you load an image. Check for the flag before starting your classification when the button is pressed. That way you can make it display that image is not loaded.

Hope it helps

[Satyabrata Nath]

Thanks . If you could provide any of the suggestions with a code , it will be a great help.