Can't execute this function!!!

Hi guys. I'm trying to call a script (printq.m) to synchronize printed data on a txt file but I get the error:

??? Error while evaluating TimerFcn for timer 'timer-1'

Undefined variable "printq" or class "printq.m".

These are my functions:

Main:

t1 = timer; set(t1,'executionMode','fixedRate'); set(t1,'Period', 0.016); set(t1,'TimerFcn','printq.m'); start(t1) clf p560.plot(q)

sub:

fid = fopen('c:\\angjun.txt','wt'); % Note the 'wt' for writing in text mode fprintf(fid,'%f',q); % The format string is applied to each element of a fclose(fid);

Could you guys help me out?

Thank you

Answer 1

[Image Analyst]

See this snippet where I create a timer where the timer callback function needs to get the handles structure (from GUIDE):

% Create a new timer object.
% The callback function that will be executed when the timer fires off
% will be called TimerCallBack() and it will take the GUIDE handles
% structure as an input argument
fprintf('Creating timer object...\n');
timerObject = timer('TimerFcn', {@TimerCallBack, handles}, 'ExecutionMode', 'fixedSpacing', 'Period', 0.05);

% This is the callback function that gets executed whenever the timer fires off.
% There are two internal, reserved input arguments hObject and eventdata
% but we don't care about those so replace them with tildes.
% handles is the GUIDE handles structure so we can do things like
% interact with controls, set text labels, display images, 
% or whatever we want to do with the user interface.
function TimerCallBack(~, ~, handles)
try
  % Some code
catch ME
  errorMessage = sprintf('Error in function %s() at line %d.\n\nError Message:\n%s', ...
    ME.stack(1).name, ME.stack(1).line, ME.message);
  fprintf(1, '%s\n', errorMessage);
  uiwait(warndlg(errorMessage));
end

See this snippet where I just call a function that doesn't require any arguments:

% --- Executes on button press in btnStartTimer.
function btnStartTimer_Callback(hObject, eventdata, handles)
% hObject    handle to btnStartTimer (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
  handles.objTimer = timer('TimerFcn', @TimerCallback, 'Period', 2.0);
  start(handles.objTimer);
  % Update handles structure
    guidata(hObject, handles);
  return;
  
function TimerCallback()
  msgboxw(datestr);