How to pass values between callback functions in GUI?

I know my question have been repeated many time in this platform, but since I have tried some suggested answers and get nothing to solve my problem, I am writing this question. I have made a GUI that includes different components. My general problem is how to pass values of different callback functions from one to other. For example in my GUI, I have two push-button callbacks, one for plotting and the other one for clearing the figure, that is out of GUI window/figure.

 function pbplot_Callback(hObject, eventdata,handles) % plotting function (push-button)
figure (1)
plot(x,y, 'color', [a b c], 'linestyle', d)
hplot = findobj('Type','figure');
hold on % this is for adding new graphs
handles.hplot = hplot
guidata(hObject,handles)

 function pbclear_Callback(hObject, eventdata,handles) % clearing function (push-button)
hplot = handles.hplot;
clf (hplot)
guidata(hObject,handles)

The error I get when I push the plot push-button is "Attempt to reference field of non-structure array." referring to "guidata(hObject.handles)". Getting information from handels, within plot callback function, shows "hplot: {2x1 double]". Could someone please help me to find the problem.

PS: x,y,a,b,c, and d are intorduced to the plot callback function.

[Stephen23]

http://www.mathworks.com/help/matlab/creating_guis/share-data-among-callbacks.html

[Ali Y.]

Thank you Stephen. I have to say that, I already tried Matlab's helps, but I think there is a glitch in my neuron system :) causing not to understand the help comprehensively. You can say do not use the Matlab if so, but I have to use it. Although, I solved my problem just by clf(figure(1)), but still need any help to understand the passing issue.

About my question, I think the problem return to figure properties, because in other callbacks I am able to pass data, if not all the time. In this case, I tried the following, but still can not get hplot outside of plot push button.

 function pbplot_Callback(hObject, eventdata,handles) % plotting callback
hplot = figure (1)
plot(x,y, 'color', [a b c], 'linestyle', d)
hold on 
guidata(hfig,struct('val', 0)) % this gives me number 1, the value I need to pass to the other function.
guidata(hObject,hfig) % This doesn't pass the hplot value (1)???

 function pbclear_Callback(hObject, eventdata,handles) % clearing callback
guidata(hplot) % not working
guidata(hObject,hplot) % not working
clf (hplot)

Answer 1

[Azzi Abdelmalek]

Use guidata

[Ali Y.]

Hi Azzi; I'm trying guidata, but in this case it doesn't work. I think I don't get right properties of the figure.