why this GUI error occurs?

I made a simple GUI function, but there are a tiny problem. GUI works, but in command window,

*'F1_CreateFcn'은(는) 정의되지 않은 함수 또는 변수입니다.

오류 발생: gui_mainfcn (line 95) feval(varargin{:});

오류 발생: untitled2 (line 42) gui_mainfcn(gui_State, varargin{:});

오류 발생: matlab.graphics.internal.figfile.FigFile/read>@(hObject,eventdata)untitled2('F1_CreateFcn',hObject,eventdata,guidata(hObject))*

I saw this error...

source code like this.

function varargout = untitled2(varargin)
% UNTITLED2 MATLAB code for untitled2.fig
%      UNTITLED2, by itself, creates a new UNTITLED2 or raises the existing
%      singleton*.
%
%      H = UNTITLED2 returns the handle to a new UNTITLED2 or the handle to
%      the existing singleton*.
%
%      UNTITLED2('CALLBACK',hObject,eventData,handles,...) calls the local
%      function named CALLBACK in UNTITLED2.M with the given input arguments.
%
%      UNTITLED2('Property','Value',...) creates a new UNTITLED2 or raises the
%      existing singleton*.  Starting from the left, property value pairs are
%      applied to the GUI before untitled2_OpeningFcn gets called.  An
%      unrecognized property name or invalid value makes property application
%      stop.  All inputs are passed to untitled2_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 untitled2

% Last Modified by GUIDE v2.5 16-Oct-2017 17:13:23

% Begin initialization code - DO NOT EDIT
gui_Singleton = 1;
gui_State = struct('gui_Name',       mfilename, ...
                   'gui_Singleton',  gui_Singleton, ...
                   'gui_OpeningFcn', @untitled2_OpeningFcn, ...
                   'gui_OutputFcn',  @untitled2_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 untitled2 is made visible.
function untitled2_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 untitled2 (see VARARGIN)

% Choose default command line output for untitled2
handles.output = hObject;

% Update handles structure
guidata(hObject, handles);

% UIWAIT makes untitled2 wait for user response (see UIRESUME)
% uiwait(handles.figure1);

% --- Outputs from this function are returned to the command line.
function varargout = untitled2_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 F1_Callback(hObject, eventdata, handles)
% hObject    handle to y (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 y as text
%        str2double(get(hObject,'String')) returns contents of y as a double

% --- Executes during object creation, after setting all properties.
function y_CreateFcn(hObject, eventdata, handles)
% hObject    handle to y (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 F2_Callback(hObject, eventdata, handles)
% hObject    handle to F2 (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 F2 as text
%        str2double(get(hObject,'String')) returns contents of F2 as a double

% --- Executes during object creation, after setting all properties.
function F2_CreateFcn(hObject, eventdata, handles)
% hObject    handle to F2 (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 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)
f1=str2double(get(handles.F1,'string'));
f2=str2double(get(handles.F2,'string'));
t=1:1:9;
y=f1*t+f2;
plot(handles.axes1,t,y);

I want to know why this error occurs and how can I solve this... My advisor can MATLAB, but he is sooooooo busy so I cannot ask him...

Answer 1

[Walter Roberson]

It probably has something to do with the fact that your code has a y_CreateFcn but nothing else having to do with y_*, as if you editted the F1 to y at some point.

[Kyungsun Ha]

Thank you for answer.

y is variable for drawing graph. (and tag of Fixed string)

[Kyungsun Ha]

Then how can I solve this problem? Can I solve this problem move y=f1*t+f2; to y_CreateFcn and change something?

[Walter Roberson]

Attach your .fig and your .m and I will look at it.

[Kyungsun Ha]

This is fig and m-file.. m-file codes written at my query.

[Walter Roberson]

Add a new function:

function F1_CreateFcn(hObject, eventdata, handles)
% hObject    handle to F1 (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

[Kyungsun Ha]

Thank you for your answer! it was solved..