suppose there are two buttons in a GUI and from first button i browsed an audio file and now i want to use that audio file in the callback function of second button for further processing on that audio file with second button

This is code for button 1:

function pushbutton1_Callback(hObject, eventdata, handles)

[filename, pathname] = uigetfile({'*.wav'}, 'Select File');

fullpathname = strcat (pathname, filename);

[x,fs] = audioread(fullpathname);

%check apakah user menekan batal pada dialog

if isequal(filename,0) || isequal(pathname,0)

uiwait(msgbox ('User pressed cancel','failed','modal') )

hold on;

else

uiwait(msgbox('Audio have been selected','sucess','modal'));

hold off;

x = x (:,1)

N = length(x);

t = (0:N-1)/fs;

N/fs

%plot

plot(t,x)

grid on

xlabel('Time (s)')

ylabel('Ampl')

end

handles.output = hObject;

guidata(hObject, handles);

This is code for button 2:

function pushbutton4_Callback(hObject, eventdata, handles

handles.fullpathname = fullpathname;

if isfield(handles, 'fullpathname')

fullpathname = handles.fullpathname;

sr = 44100; %sampling rate

w = 512; %window size

T = w/sr; %period

t = linspace(0, 1, 44100);

twindow = t(1:512);

hamming = 0.54 - 0.46 * cos((2 * pi * twindow)/T);

axes5(handles.axes);

plot(hamming);

end

its not showing plot(hamming) after processing in axes why? how can we resolve that error? please guide