Tone playback based on GUI edit box input

Hello. I am trying to use the GUI to play back a pure tone based on the value entered in the edit box. I would like the pure tone to play at the frequency entered in the edit box, without having to manually define each elseif statement as I've done below with 300, 400, 500, and 250 Hz values:

% --- Executes on button press in pb_tone.
function pb_tone_Callback(hObject, eventdata, handles)
% hObject    handle to pb_tone (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
t=0:1/44100:(1-1/44100);
fs=44100;;
freq=str2num(get(handles.edit_freq,'String'));

if freq==300
    y=cos(2*pi*300*t);
    sound(y,fs);
elseif freq==400
    y=cos(2*pi*400*t);
    sound(y,fs);
elseif freq==500
    y=cos(2*pi*500*t);
    sound(y,fs);
else
    y=cos(2*pi*250*t);
    sound(y,fs);
end

function edit_freq_Callback(hObject, eventdata, handles)
% hObject    handle to edit_freq (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Hints: get(hObject,'String') returns contents of edit_freq as text
%        str2double(get(hObject,'String')) returns contents of edit_freq as a double

Any help would be very much appreciated. Thank you.

Answer 1

[Jan]

    y = cos(2 * pi * freq * t);
    sound(y, fs);

[Brandon Merritt]

Thank you very much!