GUI set handles don't pass value

Hi, I have if statement, to change added value in GUI edit text button if it is greater than 16. Right now it isn't working, what I should change in it? Part of code:

function etfM_Callback(hObject, eventdata, handles)
global fM;
fM = get(hObject,'String');
 if fM>16
  fM = 'NaN';
  set(handles.etfM, 'String', fM);
 end

Answer 1

[Niklas Nylén]

fM = get(hObject,'String') will return a string. To compare it to 16 in the if statement you need to convert it to a number. One option is to make the following change:

 fM = str2num(get(hObject,'String'))

[ZK]

True, work, thanks.