MATLAB新手快来 新手问题交流帖

你好，能解释一下以下gui个部分的功能吗


function varargout = eggui3(varargin)
% EGGUI3 M-file for eggui3.fig
% EGGUI3, by itself, creates a new EGGUI3 or raises the existing
% singleton*.
%
% H = EGGUI3 returns the handle to a new EGGUI3 or the handle to
% the existing singleton*.
%
% EGGUI3('CALLBACK',hObject,eventData,handles,...) calls the local
% function named CALLBACK in EGGUI3.M with the given input arguments.
%
% EGGUI3('Property','Value',...) creates a new EGGUI3 or raises the
% existing singleton*. Starting from the left, property value pairs are
% applied to the GUI before eggui3_OpeningFunction gets called. An
% unrecognized property name or invalid value makes property application
% stop. All inputs are passed to eggui3_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 eggui3

% Last Modified by GUIDE v2.5 25-Oct-2006 20:33:17

% Begin initialization code - DO NOT EDIT
gui_Singleton = 1;
gui_State = struct('gui_Name', mfilename, ...
'gui_Singleton', gui_Singleton, ...
'gui_OpeningFcn', @eggui3_OpeningFcn, ...
'gui_OutputFcn', @eggui3_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 eggui3 is made visible.
function eggui3_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 eggui3 (see VARARGIN)

% Choose default command line output for eggui3
handles.output = hObject;

% Update handles structure
guidata(hObject, handles);

% UIWAIT makes eggui3 wait for user response (see UIRESUME)
% uiwait(handles.figure1);

% --- Outputs from this function are returned to the command line.
function varargout = eggui3_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 figure1_CreateFcn(hObject, eventdata, handles)
% hObject handle to figure1 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles empty - handles not created until after all CreateFcns called

function zeta_edit_Callback(hObject, eventdata, handles)
% hObject handle to zeta_edit (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 zeta_edit as text
% str2double(get(hObject,'String')) returns contents of zeta_edit as a double
z=str2num(get(handles.zeta_edit,'string'));
t=0:0.1:15;
cla;
%plot(t,sin(t));
for k=1:length(z)
y(:,k)=step(1,[2*z(k),1],t);
line(t,y(:,k));
end

% --- Executes during object creation, after setting all properties.
function zeta_edit_CreateFcn(hObject, eventdata, handles)
% hObject handle to zeta_edit (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 gridon_push.
function gridon_push_Callback(hObject, eventdata, handles)
% hObject handle to gridon_push (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
grid on;

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

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

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

% --------------------------------------------------------------------
function Untitled_2_Callback(hObject, eventdata, handles)
% hObject handle to Untitled_2 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
box on;

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

要直接运行的m文件把matlab打开，再打开文件。或者设置当前路径，不要双击文件打开

[此贴子已经被作者于2006-12-7 15:41:19编辑过]

用龙格库塔法编了一个程序，在进行数值仿真时出了一个问题，主要内容如下
函数：
function R=rk4(f,a,b,ya,N)
h=(b-a)/N;
T=zeros(1,N+1);
Y=zeros(1,N+1);
T=a:h:b;
Y(1)=ya;
for j=1:N
k1=h*feval(f,T(j),Y(j));
k2=h*feval(f,T(j)+h/2,Y(j)+k1/2);
k3=h*feval(f,T(j)+h/2,Y(j)+k2/2);
k4=h*feval(f,T(j)+h,Y(j)+k3);
Y(j+1)=Y(j)+(k1+k2+k3+k4)/6;
end
R=[T' Y'];
命令：
>> syms t
>> f=t^2;
>> a=0;
>> b=10;
>> ya=0;
>> N=100;
>> rk4(f,a,b,ya,N)
??? Error using ==> feval
Argument must contain a string or function_handle.

Error in ==> D:\matlab\rk4.m
On line 8 ==> k1=h*feval(f,T(j),Y(j));
请问这是怎么一回事？

想在一张图上显示多个图像 应该用到循环 不过具体的指令是什么啊？/初步试了一下c的结构 结论是error!~~
想求助各位怎样在MAT中进行编程？？

请问以下程序解出的x为什么是小数，而答案是x=[0 0 15 18 0 0 0 12 1]
f=[5 9 2 3 4 7 6 2 8];
>> aeq=[1 1 1 0 0 0 0 0 0; 0 0 0 1 1 1 0 0 0; 0 0 0 0 0 0 1 1 1;1 0 0 1 0 0 1 0 0;0 1 0 0 1 0 0 1 0; 0 0 1 0 0 1 0 0 1];
>> beq=[15;18;17;18;12;16];
>> lb=[0;0;0;0;0;0;0;0;0];
>> [x,fval]=linprog(f,[],[],aeq,beq,lb)
Exiting: One or more of the residuals, duality gap, or total relative error
has stalled:
the primal appears to be infeasible (and the dual unbounded).
(The dual residual < TolFun=1.00e-008.)

x =

0.0097
0.0127
14.9776
17.6603
0.0065
0.3331
0.3300
15.9808
0.6893

fval =

124.9127

请问 matlab中的的递归是怎么用的？