control dc motor speed

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 I have following code to control DC motor through H-Bridge and Arduino :
   function motor_control2_OpeningFcn(hObject, eventdata, handles, varargin)
    a = arduino('com3');
    handles.a = a;
    % This function has no output args, see OutputFcn.
    % hObject    handle to figure
    % eventdata  reserved - to be defined in a future version of MATLAB
    % handles    structure with handles and user data (see GUIDATA)
    % varargin   command line arguments to motor_control2 (see VARARGIN)
    % Choose default command line output for motor_control2
    handles.output = hObject;
    % Update handles structure
    guidata(hObject, handles);
    % UIWAIT makes motor_control2 wait for user response (see UIRESUME)
    % uiwait(handles.figure1);
    % --- Outputs from this function are returned to the command line.
    function varargout = motor_control2_OutputFcn(hObject, eventdata, handles) 
    % varargout  cell array for returning output args (see VARARGOUT);
    % hObject    handle to figure
    % eventdata  reserved - to be defined in a future version of MATLAB
    % handles    structure with handles and user data (see GUIDATA)
    % Get default command line output from handles structure
    varargout{1} = handles.a;
    % --- Executes on button press in forwardpushbutton1.
    function forwardpushbutton1_Callback(hObject, eventdata, handles)
    handles.a.pinMode(9,'output');
    handles.a.pinMode(10,'output');
    handles.a.pinMode(3, OUTPUT);
    handles.a.digitalWrite(9,0)
    handles.a.digitalWrite(10,0)
    handles.a.analogWrite(3,200)  % control the speed 0- 255

Pin 3 is the enablepin which i can control the speed of motor.Now,i have a question, can i just adjust the speed using slider in GUI? How can i do that?I have the analog write value from 0 - 255 to adjust the speed, then i wish to adjust the speed when my motor move using slider. Any expert can help me?thanks