Bonjour, je débute sur les IHM en Matlab et j'aurais besoin d'un peu d'aide s'il vous plait. Pour apprendre, j'ai refait l'exemple qui était donné dans l'aide de Matlab (la courbe en 3D avec les push_button surf, mesh et contour). Maintenant, pour m'entraîner, j'aimerais faire une IHM qui fasse la chose suivante : je veux résoudre le système d'équations

xdot(1)=x(2); xdot(2)=x(1)

en utilisant ode45 ou ode23tb. L'utilsateur doit donc rentrer les conditions initiales (x1 et x2) le temps initial d'intégration (t0) ainsi que le temps final (tfin) et avec une liste déroulante, faire le choix entre ode45 ou ode23tb.
Puis, l'utilsateur appuie sur le bouton "Run" et Matlab doit calculer la solution de mes équations. Enfin, en appuyant sur le bouton "Post-processing", je désire tracer les solutions. Pour l'instant, oubions le Post-processing.

Mon problème est le suivant : lorsque j'appuie sur Run, j'ai l'erreur suivante

??? Undefined function or variable 'x3'.

Error in ==> essai>run_pushbutton_Callback at 132
if(x3==1)

Error in ==> gui_mainfcn at 75
feval(varargin{:});

Error in ==> essai at 42
gui_mainfcn(gui_State, varargin{:});

??? Error using ==> essai('run_pushbutton_Callback',gcbo,[],guidata(gcbo))
Undefined function or variable 'x3'.

??? Error while evaluating uicontrol Callback
Je m'en doute (x3 est une variable locale). pourriez-vous m'aider s'il vous plait ? Dois-je passer par une variable globale ? Ne me suis-je pas tromper dans mes edit_CreateFcn et les edit_Callback ?

Merci d'avance de votre aide.

Voici mon essai.m

Code : Sélectionner tout - Visualiser dans une fenêtre à part
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function varargout = essai(varargin)
% ESSAI M-file for essai.fig
%      ESSAI, by itself, creates a new ESSAI or raises the existing
%      singleton*.
%
%      H = ESSAI returns the handle to a new ESSAI or the handle to
%      the existing singleton*.
%
%      ESSAI('CALLBACK',hObject,eventData,handles,...) calls the local
%      function named CALLBACK in ESSAI.M with the given input arguments.
%
%      ESSAI('Property','Value',...) creates a new ESSAI or raises the
%      existing singleton*.  Starting from the left, property value pairs are
%      applied to the GUI before essai_OpeningFunction gets called.  An
%      unrecognized property name or invalid value makes property application
%      stop.  All inputs are passed to essai_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 essai
 
% Last Modified by GUIDE v2.5 01-Oct-2007 22:58:34
 
% Begin initialization code - DO NOT EDIT
gui_Singleton = 1;
gui_State = struct('gui_Name',       mfilename, ...
                   'gui_Singleton',  gui_Singleton, ...
                   'gui_OpeningFcn', @essai_OpeningFcn, ...
                   'gui_OutputFcn',  @essai_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 essai is made visible.
function essai_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 essai (see VARARGIN)
 
% Choose default command line output for essai
handles.output = hObject;
 
% Update handles structure
guidata(hObject, handles);
 
% UIWAIT makes essai wait for user response (see UIRESUME)
% uiwait(handles.figure1);
 
 
% --- Outputs from this function are returned to the command line.
function varargout = essai_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;
 
 
 
function x1_edit_Callback(hObject, eventdata, handles)
% hObject    handle to x1_edit (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
 
x1=str2double(get(hObject,'String'))
 
% Hints: get(hObject,'String') returns contents of x1_edit as text
%        str2double(get(hObject,'String')) returns contents of x1_edit as a double
 
 
% --- Executes during object creation, after setting all properties.
function x1_edit_CreateFcn(hObject, eventdata, handles)
% hObject    handle to x1_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
 
 
 
function x2_edit_Callback(hObject, eventdata, handles)
% hObject    handle to x2_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 x2_edit as text
%        str2double(get(hObject,'String')) returns contents of x2_edit as a double
 
x2=str2double(get(hObject,'String'))
 
 
% --- Executes during object creation, after setting all properties.
function x2_edit_CreateFcn(hObject, eventdata, handles)
% hObject    handle to x2_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 run_pushbutton.
function run_pushbutton_Callback(hObject, eventdata, handles)
% hObject    handle to run_pushbutton (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
 
if(x3==1)
    [t Y]=ode45(@systemODE,[t0 tfin],[x1;x2])
elseif(x3==2)
    [t Y]=ode23tb(@systemODE,[t0 tfin],[x1;x2]);
end
 
 
% --- Executes on button press in post_processing_pushbutton.
function post_processing_pushbutton_Callback(hObject, eventdata, handles)
% hObject    handle to post_processing_pushbutton (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
 
 
% --- Executes on selection change in methods_popupmenu.
function methods_popupmenu_Callback(hObject, eventdata, handles)
% hObject    handle to methods_popupmenu (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
 
 
% Hints: contents = get(hObject,'String') returns methods_popupmenu contents as cell array
%        contents{get(hObject,'Value')} returns selected item from methods_popupmenu
 
% Determine the selected data set.
str = get(hObject, 'String');
val = get(hObject,'Value');
% Set current data to the selected data set.
switch str{val};
case 'ode45' % User selects ode45.
   x3=1
case 'ode23tb' % User selects ode23tb.
  x3=2
end
% Save the handles structure.
guidata(hObject,handles)
 
% --- Executes during object creation, after setting all properties.
function methods_popupmenu_CreateFcn(hObject, eventdata, handles)
% hObject    handle to methods_popupmenu (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    empty - handles not created until after all CreateFcns called
 
% Hint: popupmenu 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
 
 
 
function t0_edit_Callback(hObject, eventdata, handles)
% hObject    handle to t0_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 t0_edit as text
%        str2double(get(hObject,'String')) returns contents of t0_edit as a double
 
t0=str2double(get(hObject,'String'))
 
 
% --- Executes during object creation, after setting all properties.
function t0_edit_CreateFcn(hObject, eventdata, handles)
% hObject    handle to t0_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
 
 
 
function tfin_edit_Callback(hObject, eventdata, handles)
% hObject    handle to tfin_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 tfin_edit as text
%        str2double(get(hObject,'String')) returns contents of tfin_edit as a double
 
tfin=str2double(get(hObject,'String'))
 
 
% --- Executes during object creation, after setting all properties.
function tfin_edit_CreateFcn(hObject, eventdata, handles)
% hObject    handle to tfin_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
 
% the system xdot=f(t,x) where f is the function system
function systemODE(t,x)
xdot=zeros(length(x),1);
xdot(1)=x(2);
xdot(2)=x(1);