plotting a signal

i can't run this code:

function varargout = plotSg(varargin)
% PLOTSG M-file for plotSg.fig
%      PLOTSG, by itself, creates a new PLOTSG or raises the existing
%      singleton*.
%
%      H = PLOTSG returns the handle to a new PLOTSG or the handle to
%      the existing singleton*.
%
%      PLOTSG('CALLBACK',hObject,eventData,handles,...) calls the local
%      function named CALLBACK in PLOTSG.M with the given input arguments.
%
%      PLOTSG('Property','Value',...) creates a new PLOTSG or raises the
%      existing singleton*.  Starting from the left, property value pairs are
%      applied to the GUI before plotSg_OpeningFcn gets called.  An
%      unrecognized property name or invalid value makes property application
%      stop.  All inputs are passed to plotSg_OpeningFcn via varargin.
%
%      *See GUI Options on GUIDE's Tools menu.  Choose "GUI allows only one
%      instance to run (singleton)".
%
% See also: GUIDE, GUIDATA, GUIHANDLES

% Edit the above text to modify the response to help plotSg

% Last Modified by GUIDE v2.5 25-Feb-2012 10:07:34

% Begin initialization code - DO NOT EDIT
gui_Singleton = 1;
gui_State = struct('gui_Name',       mfilename, ...
                   'gui_Singleton',  gui_Singleton, ...
                   'gui_OpeningFcn', @plotSg_OpeningFcn, ...
                   'gui_OutputFcn',  @plotSg_OutputFcn, ...
                   'gui_LayoutFcn',  [] , ...
                   'gui_Callback',   []);
if nargin && ischar(varargin{1})
    gui_State.gui_Callback = str2func(varargin{1});
end

if nargout
    [varargout{1:nargout}] = gui_mainfcn(gui_State, varargin{:});
else
    gui_mainfcn(gui_State, varargin{:});
end
% End initialization code - DO NOT EDIT

% --- Executes just before plotSg is made visible.
function plotSg_OpeningFcn(hObject, eventdata, handles, varargin)
% 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 plotSg (see VARARGIN)

% Choose default command line output for plotSg
handles.output = hObject;

% Update handles structure
guidata(hObject, handles);

% UIWAIT makes plotSg wait for user response (see UIRESUME)
% uiwait(handles.figure1);

% --- Outputs from this function are returned to the command line.
function varargout = plotSg_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.output;

% --- Executes on button press in plotButton.
function plotButton_Callback(hObject, eventdata, handles)
% hObject    handle to plotButton (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
%get the freq and cnvert it to number
freq=str2num(get(handles.edit1('string')))
%creer sg
x=0:2*pi/1000:2*pi;
x=sin(freq*x);
%impoter sg ds axe
axes=(handles.axes1);
%plot sg
       plot(x);

function edit1_Callback(hObject, eventdata, handles)
% hObject    handle to edit1 (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 edit1 as text
%        str2double(get(hObject,'String')) returns contents of edit1 as a double

% --- Executes during object creation, after setting all properties.
function edit1_CreateFcn(hObject, eventdata, handles)
% hObject    handle to edit1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    empty - handles not created until after all CreateFcns called

% Hint: edit controls usually have a white background on Windows.
%       See ISPC and COMPUTER.
if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
    set(hObject,'BackgroundColor','white');
end

% --- Executes on button press in checkbox3.
function checkbox3_Callback(hObject, eventdata, handles)
% hObject    handle to checkbox3 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Hint: get(hObject,'Value') returns toggle state of checkbox3

% --- Executes on button press in checkbox4.
function checkbox4_Callback(hObject, eventdata, handles)
% hObject    handle to checkbox4 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Hint: get(hObject,'Value') returns toggle state of checkbox4

[Walter Roberson]

What prevents you from running it?

[Walter Roberson]

I do not have the .fig file so I cannot test this code.

Line 84 is dubious. It currently says

axes=(handles.axes1);

which assigns a value to a _variable_ named "axes", rather than calling the axes() routine. The code would make more sense without the "=" there.