How can I put edit text 's value in popup menu in GUI surface?

I am trying to plot 2 seperate graph on same axes, I am taking some values from edit text.My popup menu has two element and I want to plot this two choise according to edit text's values. But I didnt call edit text's value inside popup menu and also I want to plot axes

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if true
  function popupmenu1_Callback(hObject, eventdata, handles)

val = get(hObject,'Value'); str = get(hObject, 'String'); samplerate = str2double(get(handles.samplerate_input,'String'));

airflow_input=importdata('airflow_test_data.txt'); spo2_input=importdata('spo2_test_data.txt'); switch str{val};

case 'Airflow Area'

   area(handles.axes1,airflow_area(airflow_input,samplerate));
   hold off;

case 'Airflow Deviation'

    area(handles.axes1,airflow_dev(airflow_input,samplerate));
    hold off;

function first_input_Callback(hObject, eventdata, handles)

first_input = str2double(get(hObject,'String'));

if isnan(first_input) ~isreal(first_input)

    set(handles.plot_button,'String','Cannot plot samplerate')
    set(handles.plot_button,'Enable','off')
    uicontrol(hObject)
else 
    set(handles.plot_button,'String','Plot')
    set(handles.plot_button,'Enable','on')
end

function first_input_CreateFcn(hObject, eventdata, handles)

if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor')) set(hObject,'BackgroundColor','white'); end end