Leon - you could add a timer to your GUI that periodically checks the workspace for the three variables, updating the GUI window (say text controls) with their (perhaps modified) values. In the _OpeningFcn of your GUI, you could create and start the timer as
% Choose default command line output for ReadFromWorkspace
handles.output = hObject;
% create the timer object
handles.timer = timer('Name','ReadFromWS', ...
'Period',1, ...
'StartDelay',1, ...
'TasksToExecute',inf, ...
'ExecutionMode','fixedSpacing', ...
'TimerFcn',{@timerCallback,handles.figure1});
% Update handles structure
guidata(hObject, handles);
% start the timer
start(handles.timer);
In the above we create and start a timer that will fire every one second (period). The callback that fires is timerCallback and it takes one additional input parameter which is the handle to the GUI figure. Now we define the callback (in the GUI) as
function timerCallback(~,~,hFigure)
% get the handles to the controls
handles = guidata(hFigure);
% does the variable exist in the base workspace?
if evalin('base','exist(''x'',''var'')')
% variable exists, so read it
x = evalin('base','x');
else
% variable doesn't exist, so set local to empty
x = [];
end
if evalin('base','exist(''y'',''var'')')
y = evalin('base','y');
else
y = [];
end
if evalin('base','exist(''z'',''var'')')
z = evalin('base','z');
else
z = '';
end
% update the controls
set(handles.text1,'String',num2str(x));
set(handles.text2,'String',num2str(y));
set(handles.text3,'String',z);
The above assumes that we are interested in reading the local variables x, y and z from the base workspace. If they exist, then we read it, and set the text controls. Note how we use the GUI figure handle to get the handles to the controls via guidata.
See the attached for an example. Try running it and creating and then modifying the base variables x, y, and z.
