Error gui_mainfcn(gui_State, varargin{:});

I need to make a program that will build the given functions, and for this I created a GUI through GUIDE, but when I write the function, it gives an error

Error gui_mainfcn(gui_State, varargin{:}); Error in matlab.graphics.internal.figfile.FigFile/read>@(hObject,eventdata)TOSAPRLAB4('pushbutton1_Callback',hObject,eventdata,guidata(hObject))

Error while evaluating UIControl Callback.

and I can't figure out what exactly is the problem. Am I doing something wrong or is the code outdated?

here is my code:

function varargout = TOSAPRLAB4(varargin)

gui_Singleton = 1;
gui_State = struct('gui_Name',       mfilename, ...
                   'gui_Singleton',  gui_Singleton, ...
                   'gui_OpeningFcn', @TOSAPRLAB4_OpeningFcn, ...
                   'gui_OutputFcn',  @TOSAPRLAB4_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

function TOSAPRLAB4_OpeningFcn(hObject, eventdata, handles, varargin)

handles.output = hObject;


guidata(hObject, handles);

function varargout = TOSAPRLAB4_OutputFcn(hObject, eventdata, handles) 

varargout{1} = handles.output;

function pushbutton1_Callback(hObject, eventdata, handles)
interval=str2num(char(get(handles.edInterval,'String')));
f=(char(get(handles.edEquation,'String')));
[x,y]=fplot(f, interval);
handles.line=plot(x,y,'c-');
guidata(gcbo,handles);
hold on


function pushbutton2_Callback(hObject, eventdata, handles)
interval=str2num(char(get(handles.edInterval,'String')));
x1=interval(1);
x2=interval(2);
f=inline(char(get(handles.edEquation,'String')));
x=fminbnd(f,x1,x2);
y=f(x);
plot(x,y,'r.','MarkerSize',25);


function pushbutton3_Callback(hObject, eventdata, handles)
interval=str2num(char(get(handles.edInterval,'String')));
x1=interval(1);
x2=interval(2);
f=inline(char(get(handles.edEquation,'String')));
x=fzero(f,(x1+x2)/2);
y=f(x);
plot(x,y,'g.','MarkerSize',25);


function checkbox1_Callback(hObject, eventdata, handles)
if get(hObject,'Value')
set(gca,'XGrid','on')
else
set(gca,'XGrid','off')
end


function checkbox2_Callback(hObject, eventdata, handles)
if get(hObject,'Value')
set(gca,'YGrid','on')
else
set(gca,'YGrid','off')
end


function popupmenu1_Callback(hObject, eventdata, handles)
Num=get(hObject,'Value');
switch Num
case 1
set(handles.line,'LineStyle','-');
case 2
set(handles.line,'LineStyle','- -');
case 3
set(handles.line,'LineStyle',':');
case 4
set(handles.line,'LineStyle','-.');
end


function popupmenu1_CreateFcn(hObject, eventdata, handles)

if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
    set(hObject,'BackgroundColor','white');
end



function popupmenu2_Callback(hObject, eventdata, handles)
Num=get(hObject,'Value');
switch Num
case 1
set(handles.line,'LineWidth',1);
case 2
set(handles.line,'LineWidth',2);
case 3
set(handles.line,'LineWidth',3);
case 4
set(handles.line,'LineWidth',4);
end


function popupmenu2_CreateFcn(hObject, eventdata, handles)

if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
    set(hObject,'BackgroundColor','white');
end


function popupmenu3_Callback(hObject, eventdata, handles)
Num=get(hObject,'Value');
switch Num
case 1
set(handles.line,'Color','cyan');
case 2
set(handles.line,'Color','red');
case 3
set(handles.line,'Color','green');
case 4
set(handles.line,'Color','blue');
case 5
set(handles.line,'Color','magenta');
case 6
set(handles.line,'Color','yellow');
case 7
set(handles.line,'Color','white');
end


function popupmenu3_CreateFcn(hObject, eventdata, handles)

if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
    set(hObject,'BackgroundColor','white');
end



function edit1_Callback(hObject, eventdata, handles)

function edit1_CreateFcn(hObject, eventdata, handles)

if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
    set(hObject,'BackgroundColor','white');
end



function edInterval_Callback(hObject, eventdata, handles)

function edInterval_CreateFcn(hObject, eventdata, handles)

if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
    set(hObject,'BackgroundColor','white');
end




function edit2_Callback(hObject, eventdata, handles)

function edit2_CreateFcn(hObject, eventdata, handles)

if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
    set(hObject,'BackgroundColor','white');
end

Answer 1

[Voss]

The GUI opens ok, but the error I get when clicking the plot button is:

Reference to non-existent field 'edInterval'.
Error in TOSAPRLAB4>pushbutton2_Callback (line 41)
interval=str2num(char(get(handles.edInterval,'String')));
Error in gui_mainfcn (line 95)
        feval(varargin{:});
Error in TOSAPRLAB4 (line 17)
    gui_mainfcn(gui_State, varargin{:});
Error in
matlab.graphics.internal.figfile.FigFile/read>@(hObject,eventdata)TOSAPRLAB4('pushbutton2_Callback',hObject,eventdata,guidata(hObject)) 
Error while evaluating UIControl Callback

That's because the edit box edInterval is still called edit2 in the .fig file. (Similarly, edEquation is called edit1.)

To fix this, open the .fig file in GUIDE, double-click on edit2 and change its Tag to edInterval (and double-click on edit1 to change its Tag to edEquation). Then save the .fig file and close any running instance of the GUI (since it's a singleton), and run the m-file again.

[Nikita]

Thank you so much. I adore you. The program has worked. You are the best!

[Voss]

You're welcome!