function varargout = lab04(varargin)
% LAB04 M-file for lab04.fig
%      LAB04, by itself, creates a new LAB04 or raises the existing
%      singleton*.
%
%      H = LAB04 returns the handle to a new LAB04 or the handle to
%      the existing singleton*.
%
%      LAB04('CALLBACK',hObject,eventData,handles,...) calls the local
%      function named CALLBACK in LAB04.M with the given input arguments.
%
%      LAB04('Property','Value',...) creates a new LAB04 or raises the
%      existing singleton*.  Starting from the left, property value pairs are
%      applied to the GUI before lab04_OpeningFunction gets called.  An
%      unrecognized property name or invalid value makes property application
%      stop.  All inputs are passed to lab04_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 lab04

% Last Modified by GUIDE v2.5 25-May-2005 13:52:01
% Begin initialization code - DO NOT EDIT
gui_Singleton = 1;
gui_State = struct('gui_Name',       mfilename, ...
                   'gui_Singleton',  gui_Singleton, ...
                   'gui_OpeningFcn', @lab04_OpeningFcn, ...
                   'gui_OutputFcn',  @lab04_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 lab04 is made visible.
function lab04_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 lab04 (see VARARGIN)

% Choose default command line output for lab04
handles.output = hObject;

% Update handles structure
guidata(hObject, handles);

% UIWAIT makes lab04 wait for user response (see UIRESUME)
% uiwait(handles.figure1);

%設(shè)置當(dāng)前窗口名
str='180度根軌跡實(shí)驗(yàn)窗口';
set(gcf,'name',str,'numbertitle','off');

% --- Outputs from this function are returned to the command line.
function varargout = lab04_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 during object creation, after setting all properties.function edit_a_CreateFcn(hObject, eventdata, handles)% hObject    handle to edit_a (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    set(hObject,'BackgroundColor','white');else    set(hObject,'BackgroundColor',get(0,'defaultUicontrolBackgroundColor'));endfunction edit_a_Callback(hObject, eventdata, handles)% hObject    handle to edit_a (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_a as text%        str2double(get(hObject,'String')) returns contents of edit_a as a double% --- Executes during object creation, after setting all properties.function edit_b_CreateFcn(hObject, eventdata, handles)% hObject    handle to edit_b (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    set(hObject,'BackgroundColor','white');else    set(hObject,'BackgroundColor',get(0,'defaultUicontrolBackgroundColor'));endfunction edit_b_Callback(hObject, eventdata, handles)% hObject    handle to edit_b (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_b as text%        str2double(get(hObject,'String')) returns contents of edit_b as a double% --- Executes during object creation, after setting all properties.function edit_c_CreateFcn(hObject, eventdata, handles)% hObject    handle to edit_c (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    set(hObject,'BackgroundColor','white');else    set(hObject,'BackgroundColor',get(0,'defaultUicontrolBackgroundColor'));endfunction edit_c_Callback(hObject, eventdata, handles)% hObject    handle to edit_c (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_c as text%        str2double(get(hObject,'String')) returns contents of edit_c as a double% --- Executes during object creation, after setting all properties.function edit_d_CreateFcn(hObject, eventdata, handles)% hObject    handle to edit_d (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    set(hObject,'BackgroundColor','white');else    set(hObject,'BackgroundColor',get(0,'defaultUicontrolBackgroundColor'));endfunction edit_d_Callback(hObject, eventdata, handles)% hObject    handle to edit_d (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_d as text%        str2double(get(hObject,'String')) returns contents of edit_d as a double% --- Executes on button press in pushbutton_sure.function pushbutton_sure_Callback(hObject, eventdata, handles)% hObject    handle to pushbutton_sure (see GCBO)% eventdata  reserved - to be defined in a future version of MATLAB% handles    structure with handles and user data (see GUIDATA)

%接受編輯框中的A,B,C,D的值并畫根軌跡圖A=str2num(get(handles.edit_a,'string'))
B=str2num(get(handles.edit_b,'string'))C=str2num(get(handles.edit_c,'string'))
D=str2num(get(handles.edit_d,'string'))
sys=ss(A,B,C,D)
subplot('Position',[0.06,0.257,0.355,0.422])
rlocus(sys)

%得出當(dāng)系統(tǒng)穩(wěn)定時(shí)的K的取值范圍
newsys=zpk(sys)
z=zero(newsys)
p=pole(newsys)
num=poly(z)
den=poly(p)
syms('x','w','k','real')
n=poly2sym(k*num,x)
d=poly2sym(den,x)
f=n+d
g=w*i
h=compose(f,g)
r=real(h)
l=simplify(imag(h))
[k,w]=solve(r,l)
k1=sym2poly(k)
if min(k1)<0
    set(handles.edit_stastic,'string',0)
else 
    set(handles.edit_stastic,'string',min(k1))
end
if max(k1)<=0
    set(handles.edit_stastic1,'string',inf)
else
    set(handles.edit_stastic1,'string',max(k1))
end
% --- Executes on button press in pushbutton_quit.function pushbutton_quit_Callback(hObject, eventdata, handles)% hObject    handle to pushbutton_quit (see GCBO)% eventdata  reserved - to be defined in a future version of MATLAB% handles    structure with handles and user data (see GUIDATA)

%設(shè)置關(guān)閉窗口提示對(duì)話框button=questdlg('Do you want to close this window?',...
    'Close Operation','Yes','No','No');
if strcmp(button,'Yes')
   close
elseif strcmp(button,'No')
    disp('Canceled file operation')
end
% --- Executes during object creation, after setting all properties.function edit_stastic_CreateFcn(hObject, eventdata, handles)% hObject    handle to edit_stastic (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    set(hObject,'BackgroundColor','white');else    set(hObject,'BackgroundColor',get(0,'defaultUicontrolBackgroundColor'));endfunction edit_stastic_Callback(hObject, eventdata, handles)% hObject    handle to edit_stastic (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_stastic as text%        str2double(get(hObject,'String')) returns contents of edit_stastic as a double% --- Executes during object creation, after setting all properties.function edit_stastic1_CreateFcn(hObject, eventdata, handles)% hObject    handle to edit_stastic1 (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    set(hObject,'BackgroundColor','white');else    set(hObject,'BackgroundColor',get(0,'defaultUicontrolBackgroundColor'));endfunction edit_stastic1_Callback(hObject, eventdata, handles)% hObject    handle to edit_stastic1 (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_stastic1 as text%        str2double(get(hObject,'String')) returns contents of edit_stastic1 as a double