please fix this problem

function varargout = cb_lm393(varargin)
% CB_LM393 MATLAB code for cb_lm393.fig
%      CB_LM393, by itself, creates a new CB_LM393 or raises the existing
%      singleton*.
%
%      H = CB_LM393 returns the handle to a new CB_LM393 or the handle to
%      the existing singleton*.
%
%      CB_LM393('CALLBACK',hObject,eventData,handles,...) calls the local
%      function named CALLBACK in CB_LM393.M with the given input arguments.
%
%      CB_LM393('Property','Value',...) creates a new CB_LM393 or raises the
%      existing singleton*.  Starting from the left, property value pairs are
%      applied to the GUI before cb_lm393_OpeningFcn gets called.  An
%      unrecognized property name or invalid value makes property application
%      stop.  All inputs are passed to cb_lm393_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 cb_lm393

% Last Modified by GUIDE v2.5 06-Jul-2021 21:29:17

% Begin initialization code - DO NOT EDIT
gui_Singleton = 1;
gui_State = struct('gui_Name',       mfilename, ...
                   'gui_Singleton',  gui_Singleton, ...
                   'gui_OpeningFcn', @cb_lm393_OpeningFcn, ...
                   'gui_OutputFcn',  @cb_lm393_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 cb_lm393 is made visible.
function cb_lm393_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 cb_lm393 (see VARARGIN)

% Choose default command line output for cb_lm393
handles.output = hObject;

% Update handles structure
guidata(hObject, handles);


% UIWAIT makes cb_lm393 wait for user response (see UIRESUME)
% uiwait(handles.figure1);




% --- Outputs from this function are returned to the command line.
function varargout = cb_lm393_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)

global s ; 
s = serial('COM2','BaudRate',9600);
fopen(s);
i=0;
while(i<200)
    i=i+1;
    nhietdo(i) = str2double(fscanf(s));
    set(handles.nhietdo,'string',num2str(nhietdo(i)));
    
    dienap(i) = str2double(fscanf(s));
    set(handles.dienap,'string',num2str(dienap(i)));
    drawnow;
    
    axes(handles.axes1);
    plot(nhietdo,'g.-','LineWidth',2);
    grid on;
    axis([0 100 0 1000]);
    
    axes(handles.axes2);
    plot(dienap,'r.-','LineWidth',2);
    grid on;
    axis([0 100 0 1000]);
end 
set(handles.pushbutton1,'Enable','on');
set(handles.pushbutton2,'Enable','off');


% --- 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)
global s;
fclose (s);
set(handles.pushbutton1,'Enable','off');
set(handles.pushbutton2,'Enable','on');




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



function edit2_Callback(hObject, eventdata, handles)
% hObject    handle to edit2 (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 edit2 as text
%        str2double(get(hObject,'String')) returns contents of edit2 as a double


% --- Executes during object creation, after setting all properties.
function edit2_CreateFcn(hObject, eventdata, handles)
% hObject    handle to edit2 (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 dienap_Callback(hObject, eventdata, handles)
% hObject    handle to dienap (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 dienap as text
%        str2double(get(hObject,'String')) returns contents of dienap as a double


% --- Executes during object creation, after setting all properties.
function dienap_CreateFcn(hObject, eventdata, handles)
% hObject    handle to dienap (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 nhietdo_Callback(hObject, eventdata, handles)
% hObject    handle to nhietdo (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 nhietdo as text
%        str2double(get(hObject,'String')) returns contents of nhietdo as a double


% --- Executes during object creation, after setting all properties.
function nhietdo_CreateFcn(hObject, eventdata, handles)
% hObject    handle to nhietdo (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 during object deletion, before destroying properties.
function figure1_DeleteFcn(hObject, eventdata, handles)
% hObject    handle to figure1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
global s;
if ( strcmp(get(s,'Status'),'open'));
    fclose(s);
end
delete(s);
clear(s);

[Steven Lord]

What is "this problem"?

• Do you receive warning and/or error messages? If so the full and exact text of those messages (all the text displayed in orange and/or red in the Command Window) may be useful in determining what's going on and how to avoid the warning and/or error.
• Does it do something different than what you expected? If so, what did it do and what did you expect it to do?
• Did MATLAB crash? If so please send the crash log file (with a description of what you were running or doing in MATLAB when the crash occured) to Technical Support using the telephone icon in the upper-right corner of this page so we can investigate.

[tran duy]

the problem:

??? Reference to non-existent field 'axes1'.

Error in ==> cb_lm393>pushbutton1_Callback at 100

axes(handles.axes1);

Error in ==> gui_mainfcn at 96

feval(varargin{:});

Error in ==> cb_lm393 at 42

gui_mainfcn(gui_State, varargin{:});

Error in ==> @(hObject,eventdata)cb_lm393('pushbutton1_Callback',hObject,eventdata,guidata(hObject))

??? Error while evaluating uicontrol Callback

Answer 1

[Walter Roberson]

Your cb_lm393.fig file does not have a graphics object with tag 'axes1' .

You can use GUIDE to create an axes with that tag, or you can modify cb_lm393_OpeningFcn to create handles.axes1 at run time.