请教各位：用gui画图怎么不能用控制里的一些画图的命令啊？我试过了画一些数学函数的图像可以，比如用plot,stem等，但是画step,nyquist都不行，有没有人能帮忙解答？
.m文件如下：
function varargout = my02(varargin)
% MY02 M-file for my02.fig
% MY02, by itself, creates a new MY02 or raises the existing
% singleton*.
%
% H = MY02 returns the handle to a new MY02 or the handle to
% the existing singleton*.
%
% MY02('CALLBACK',hObject,eventData,handles,...) calls the local
% function named CALLBACK in MY02.M with the given input arguments.
%
% MY02('Property','Value',...) creates a new MY02 or raises the
% existing singleton*. Starting from the left, property value pairs are
% applied to the GUI before my02_OpeningFunction gets called. An
% unrecognized property name or invalid value makes property application
% stop. All inputs are passed to my02_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 my02
% Last Modified by GUIDE v2.5 07-May-2007 09:57:04
% Begin initialization code - DO NOT EDIT
gui_Singleton = 1;
gui_State = struct('gui_Name', mfilename, ...
'gui_Singleton', gui_Singleton, ...
'gui_OpeningFcn', @my02_OpeningFcn, ...
'gui_OutputFcn', @my02_OutputFcn, ...
'gui_LayoutFcn', [] , ...
'gui_Callback', []);
if nargin & isstr(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 my02 is made visible.
function my02_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 my02 (see VARARGIN)
% Choose default command line output for my02
handles.output = hObject;
% Update handles structure
guidata(hObject, handles);
% UIWAIT makes my02 wait for user response (see UIRESUME)
% uiwait(handles.figure1);
% --- Outputs from this function are returned to the command line.
function varargout = my02_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 pushbutton1.
function pushbutton1_Callback(hObject, eventdata, handles)
% hObject handle to pushbutton1 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
den=[0 0 80];
num=[1 2 0];
sys=tf(num,den);
rlocus(sys);
% --- Executes on button press in pushbutton2.
function pushbutton2_Callback(hObject, eventdata, handles)
% hObject handle to pushbutton2 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
grid
