How to call user defined cost function through MATLAB GUI?

I have a push button in my GUI, where I can give path of the cost function through following code:

function Get_Cost_Function_Callback(hObject, eventdata, handles)
% hObject    handle to Get_Cost_Function (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
[FileName,PathName] = uigetfile('*.m','Select the MATLAB code file');
[pathstr,name,ext] = fileparts(FileName);
handles.name=char(name);
guidata(hObject, handles);

Now whatever cost function given by the user is stored in 'handles.name'.But the problem is that I can't call the same function in other button's callback where I have following code:

x = PSOcodeRTDA(Name,MI,np,C1,C2,w,wdamp)

Here 'Name' has the string of function but it is not working.Instead of 'Name' if I use '@cost_function1a'then only this code works but I want it to work for the functions given by the user.Please explain me how can I call the user-defined cost function.

Answer 1

[Nirav Sharda]

It looks like the function PSOcodeRTDA needs a function handle as the first argument but because it is getting a char vector its not working. Try adding this line after the handles.name = char(name) line.

handles.functionHandle = str2func(name);

Then use the functionHandle in the other functions callback instead of name. The str2func creates function handle from character vector. I hope this helps!