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How can i define variables in gui?

Asked by Emre Akinci on 6 Jun 2019
Latest activity Commented on by Jan
on 7 Jun 2019
Accepted Answer by Jan
Hey everyone I want to define variables like:
function pushbutton15_Callback(hObject, eventdata, handles)
audio = get(handles.listbox1,'String');
file = get(handles.listbox1, 'Value');
audiofile = audioread(audio{file});
and I want to use "audiofile" in math operators.
what I need to do?

  9 Comments

You cannot define entries of a popup as variables. popups have one Value property, and one String property. Value is a scalar positive integer. String is typically a cell array of character vectors, but in some cases can be a char array.
All you can do is retrieve the Value property and retrieve the String property and use the Value to index the String property.
Thank you sir, I will try it
Can I do that I want with different buttons One button for every variable? Using uigetfile

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1 Answer

Answer by Jan
on 7 Jun 2019
 Accepted Answer

It depends on what "use "audiofile" in math operators" mean. After your code, audiofile is a variable, which contains the signal of a sound. You can work with this variables as usual - inside this callback. If you want to share the contents of the variable with other callbacks:
function pushbutton15_Callback(hObject, eventdata, handles)
fileName = get(handles.listbox1,'String');
index = get(handles.listbox1, 'Value');
audioSignal = audioread(fileName{index});
handles.audioSignal = audioSignal;
guidata(hObject, handles);
end
function anyOther_Callback(hObject, eventdata, handles)
audioSignal = handles.audioSignal;
... % Do what you like with the signal here
end
I've used more meaningful names for the variables here. The list of files names is not really "audio", and the chosen index is not really "file". The contents of the file is not really "audiofile".
"Can I do that I want with different buttons One button for every variable? Using uigetfile"
Again, it depends on what you want to do. "One button for every variable" is not clear. Of course you can use uigetfile, so which problem do you have with it?

  2 Comments

I'm creating a GUI about Independent Component Analysis with audio signals. So I want the user can select any file from ilstbox but I understood I can't because I had to define every listbox item as variable that looks impossible So I will uigetfile and buttons for audiofiles user can select files so i will work on it
I do not understand, why you mean, that listbox items have to be variables. Perhaps this is useful:
...
function YourGUI_OpeningFcn(hObject, EventData, handles)
baseFolder = 'C:\Your\Data\Folder'; % Or uigetdir() ?
fileList = dir(fullfile(baseFolder, '*.wav'));
set(handles.popupmenu1, 'String', {fileList.name});
handles.baseFolder = baseFolder;
guidata(hObject, handles);
end
function pushbutton15_Callback(hObject, eventdata, handles)
fileName = get(handles.listbox1,'String');
index = get(handles.listbox1, 'Value');
audioSignal = audioread(fullfile(handles.baseFolder, fileName{index}));
handles.audioSignal = audioSignal;
guidata(hObject, handles);
end
This populates the popupmenu with the file names contained in the specified folder. You can access these files later on.

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