too many input arguements error

hi, I'm trying to create a piece of code where a created timer runs and updates a polar plot, on my GUI, with values from a slider constantly. Once I've got this working i'm hoping to be able to extrapolate without too much difficulty, Right now i keep getting an error message telling me I have too many input arguements and I'm new to matlab and have defined inputs and outputs where I felt they were required but obviously there are some missing/too many somewhere. help please! The relevant code is as follows :

function testrobotarm_OpeningFcn(hObject, eventdata, handles, varargin)

handles.output = hObject;
guidata(hObject, handles);

global t
global rho
global rado
t = timer('TimerFcn',plotting(rho,rado, hObject, eventdata, handles),'ExecutionMode','fixedRate','BusyMode','Queue','Period',0.5);

start(t)
set(handles.status,'String','Running');

function [radO] = plotting ( hObject, eventdata, handles) 
global rado
radO=rado;
polar(radO,rho,'-*m')

**************** value 'rado' is defined elsewhere in the code and its value is obtained using

rado=get(handles.slider1,'Value');

and i know this part works fine as it displays fine in an edit box I've learnt what i know of MATLAB through googling code and altering it so apologies if i'm missing something really stupid

Thanks in advance

Answer 1

[Walter Roberson]

t = timer('TimerFcn', @plotting, 'ExecutionMode', 'fixedRate', 'BusyMode', 'Queue', 'Period', 0.5);

and change

function [radO] = plotting ( hObject, eventdata, handles) 
global rado

to

function plotting( hObject, eventdata )
   global rado rho