How to access to variables saved in Matlab folder from the GUI

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Ege 2015-1-5

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https://ww2.mathworks.cn/matlabcentral/answers/169005-how-to-access-to-variables-saved-in-matlab-folder-from-the-gui

编辑： per isakson 2015-1-6

I want to load my dataset or access any other variables that are saved to my matlab folder or are in my workspace currently from the matlab GUI I created. But when I call my functions on callback function of a button, I can't do it. Could you give me a simple example how to do it?

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per isakson 2015-1-5

"any other variables that are saved to my matlab folder" &nbsp do you mean saved in a mat-file in the current folder?

See evalin

Ege 2015-1-5

Yes exactly. I mean mat files

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per isakson 2015-1-5

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/169005-how-to-access-to-variables-saved-in-matlab-folder-from-the-gui#answer_164080

编辑：per isakson 2015-1-5

在 MATLAB Online 中打开

Add lines similar to the following, which are copied from the doc on load

    filename = 'durer.mat';
    myVars = {'X','caption'};
    S = load(filename,myVars{:})

to the callback function.

&nbsp

" or are in my workspace" &nbsp see evalin, Execute MATLAB expression in specified workspace and add

my_variable = evalin( 'base', 'my_variable' )

to the callback function.

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Ege 2015-1-6

在 MATLAB Online 中打开

Thank you now I can see my loaded dataset in my workspace but still I can't do anything on it.

contents = get(handles.popup_selectds,'String'); 
popupmenu4value = contents{get(handles.popup_selectds,'Value')};
if popupmenu4value== 'Dataset-1'
   filename = 'dataset.mat';
    S = load(filename)
     assignin( 'base', 'dataset1', S.dataset )
     dosomething1
elseif popupmenu4value== 'Dataset-2'
   filename = 'dataset2.mat';
    S = load(filename)
     assignin( 'base', 'dataset2', S.dataset )
     dosomething2
end

In the do something I basically try to access some data but I can't:

churn=dataset2.churn;

Undefined variable "dataset2" or function "dataset2.churn".

Error in yap (line 16) churn=dataset2.churn;

Error in ChurnP>popup_selectds_Callback (line 111) dosomething2

Error in gui_mainfcn (line 95) feval(varargin{:});

Error in ChurnP (line 42) gui_mainfcn(gui_State, varargin{:});

Error in @(hObject,eventdata)ChurnP('popup_selectds_Callback',hObject,eventdata,guidata(hObject))

Error while evaluating uicontrol Callback

Ege 2015-1-6

Making the variables global and adding assigning solved my problem thank you very much for your help :)

per isakson 2015-1-6

编辑：per isakson 2015-1-6

"I can't do anything on it"

I assume that assignin actually assigned a variable in the base workspace
load assigns a value to the variable S.&nbsp dataset2 is not a variable, but a field of the struct S. Try churn = S.dataset2.churn;.