How can I write the code of this problem of TIC /TOC timer?

I want a code that is counting all the time since I press the pushbutton1. I have anothe pushbutton2 and when I press it if the time is less or equal to 3 s I want to display on a static or edit text a message, if the time is between 3s and 6s I want another message and between 6s and 20s the final message.

Could someone help me?

[KSSV]

Similair question: https://in.mathworks.com/matlabcentral/answers/332301-how-can-i-put-a-timer-in-my-gui

Answer 1

[Jan]

function TimingTest
H.Fig   = figure;
H.Text  = uicontrol('Style', 'text', 'FontSize', 20, ...
                    'units', 'normalized', 'Position', [0.05, 0.3, 0.9, 0.1])
Button1 = uicontrol('Style', 'PushButton', 'String', 'Start', ...
                    'units', 'normalized', 'Position', [0.05, 0.1, 0.35, 0.1], ...
                    'Callback', {@Button1CB, H});
Button2 = uicontrol('Style', 'PushButton', 'String', 'Stop', ...
                    'units', 'normalized', 'Position', [0.6, 0.1, 0.35, 0.1], ...
                    'Callback', {@Button2CB, H});
end

function Button1CB(Button1H, EventData, H)
setappdata(H.Fig, 'Started', now);
end

function Button2CB(Button1H, EventData, H)
if ~isappdata(H.Fig, 'Started')
  disp('Press Start at first!');
  return;
end
elapsed = (now - getappdata(H.Fig, 'Started')) * 86400;
if elapsed <= 3.0
  set(H.Text, 'String', '<= 3');
elseif elapsed <= 6.0
  set(H.Text, 'String', '<= 6');
elseif elapsed <= 20.0   % Or simply "else"?
  set(H.Text, 'String', 'final message');
else
  set(H.Text, 'String', 'too slow');
end
end

[Collegue]

I don't know but it doesn't work. I have written like this. What is it wrong?

    function firstbutton_Callback(hObject, eventdata, handles) 

    setappdata(H.Fig, 'Started', now);

    function secondbutton_Callback(hObject, eventdata, handles)

    elapsed = (now - getappdata(H.Fig, 'Started')) * 86400;
    if elapsed <= 3.0 
      set(handles.text2, 'String', '<= 3');
    elseif elapsed <= 6.0
      set(handles.text2, 'String', '<= 6');
    elseif elapsed <= 20.0   % Or simply "else"?
      set(handles.text2, 'String', 'final message');
    else
      set(handles.text2, 'String', 'too slow');
    end

[Jan]

Please explain "doesn't work". Do you get an error message? If so, please post it. Perhaps the "handles" struct is incomplete? Or the "end" are missing on the functions - they are optional, but when you have one "end" to close a function, all functions need one.

I guess: "H.Fig" is undefined. Use either "handles.figure" (or how the figure handle is called. Or:

FigH = ancestor(hObject, 'figure');
elapsed = (now - getappdata(FigH, 'Started')) * 86400;

Alternatively you can store the start time in the handles struct also. Then see the many threads about sharing variables between callbacks in this forum. Search for "guidata share variable".