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How to get values from workspace to GUI with 'evalin'? error occuring

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Hi,
i am just about creating my first complex GUI in MATLAB and i have one question plz. I created a GUI_1 that with the help of a push button starts a GUI_2. In GUI_2 the user can give some input values.
those input values (here for example the variable 'a') are given to the workspace with:
assignin('base', 'var1', a);
This works fine!
>> who
Your variables are:
var1 var2
Now i want to have access to this variable that i named 'var1'. This access should be in a Callback from a push Button in GUI_1. Pressing this Push Button shall load the variables from workspace and start the main script.
I use the function 'evalin' for this:
function run__Callback(hObject, eventdata, handles)
% hObject handle to run_ (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
temp1=evalin('base',var1)
Pushing the Push Button results in that error:
Undefined function or variable 'var1'.
Error in Try1>run__Callback (line 259)
temp1=eval('base',var1)
Error in gui_mainfcn (line 96)
feval(varargin{:});
Error in Try1 (line 42)
gui_mainfcn(gui_State, varargin{:});
Error in @(hObject,eventdata)Try1('run__Callback',hObject,eventdata,guidata(hObject))
Error while evaluating uicontrol Callback
How can it be? i checked the variables that are in the workspace and i saw that
function run__Callback(hObject, eventdata, handles)
% hObject handle to run_ (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
who
%temp1=evalin('base',var1)
results in
Your variables are:
eventdata hObject handles
so why arent there var1 and var2 in the workspace anymore??? why are they lost...?
Best regards, John

Accepted Answer

Geoff Hayes
Geoff Hayes on 7 Sep 2015
Edited: Geoff Hayes on 7 Sep 2015
John - in your line of code
temp1=evalin('base',var1)
the var1 should be wrapped in single quotes since the second input is an expression (see evalin for details). Try instead
temp1=evalin('base','var1')
Note that there is an alternative to using (polluting) the base workspace to share data between GUIs. See http://www.mathworks.com/matlabcentral/answers/146215-pass-data-between-gui-s which describes a couple of ways on how you can accomplish this.
  2 Comments
John
John on 7 Sep 2015
Thank you very much Geoff!! it works fine now! nevertheless i may take a look at the other opportunity and follow your link!
Thanks!!!!!:)

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