Getting Error in Matlab GUIDE

I just want to press a button and have 'ok' print to an edit field, but I keep getting the following error after I click the button:

Undefined function or variable 'pushbutton1_Callback'.

Error in gui_mainfcn (line 95)
        feval(varargin{:});

Error in PME_app2 (line 17)
    gui_mainfcn(gui_State, varargin{:});

Error in
matlab.graphics.internal.figfile.FigFile/read>@(hObject,eventdata)PME_app2('pushbutton1_Callback',hObject,eventdata,guidata(hObject)) 
Error while evaluating UIControl Callback.

Code Below

function varargout = PME_app2(varargin)

gui_Singleton = 1;
gui_State = struct('gui_Name',       mfilename, ...
                   'gui_Singleton',  gui_Singleton, ...
                   'gui_OpeningFcn', @PME_app2_OpeningFcn, ...
                   'gui_OutputFcn',  @PME_app2_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 PME_app2 is made visible.
function PME_app2_OpeningFcn(hObject, eventdata, handles, varargin)
handles.output = hObject;
guidata(hObject, handles);

end
% --- Outputs from this function are returned to the command line.
function varargout = PME_app2_OutputFcn(hObject, eventdata, handles) 

varargout{1} = handles.output;
end  
function pushbutton1_Callback(hObject, eventdata, handles)
    set(handles.edit1,'ok')
  end

% --- Executes during object creation, after setting all properties.
function pushbutton1_CreateFcn(hObject, eventdata, handles)
% hObject    handle to pushbutton1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    empty - handles not created until after all CreateFcns called
if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
    set(hObject,'BackgroundColor','white');
end
end

Answer 1

[Walter Roberson]

Your code for function pushbutton1_Callback would either have to be inside PME_app2.m or else it would have to be in its own pushbutton1_Callback.m file in order to be found.

[qiana curcuru]

It is inside PME_app2.m, I just updated the code, but still the same error.

[Walter Roberson]

The problem is that you used nested functions. GUIDE uses str2func() to try to find the functions to execute, but https://www.mathworks.com/help/matlab/ref/str2func.html

"Function handles created using str2func do not have access to variables outside of their local workspace or to nested functions. If your function handle contains these variables or functions, MATLAB® throws an error when you invoke the handle. Also, if you use a text representation of an anonymous function, the resulting function handle does not have access to private or local functions."

So this restriction on str2func() is expected.

This does not mean you cannot use nested functions together with GUIDE, but it does mean that the functions named as callbacks must not be nested functions (but they can nest things.)

This is not exactly a restriction against using nested functions to create GUIs, but it is a restriction against using str2func() to create the function handles to such functions. This means that it would be legal to create explicit function handles in the source code and match on them to figure out which one to execute.

Also, you are missing edit1_CreateFcn

[qiana curcuru]

it works!! thank you!!

[Datta Sai Raipally]

hey..I got the same error..how to fix it?

[Walter Roberson]

Do not use nested functions with GUIDE

[Datta Sai Raipally]

then what to do..?

[Datta Sai Raipally]

can u please help me out of this..

[Walter Roberson]

What to do is rewrite the code so that you do not use nested functions.

[Walter Roberson]

http://matlab.wikia.com/wiki/FAQ#How_can_I_share_data_between_callback_functions_in_my_GUI.28s.29.3F

[Datta Sai Raipally]

function varargout = main(varargin)
% MAIN M-file for main.fig
%      MAIN, by itself, creates a new MAIN or raises the existing
%      singleton*.
%
%      H = MAIN returns the handle to a new MAIN or the handle to
%      the existing singleton*.
%
%      MAIN('CALLBACK',hObject,eventData,handles,...) calls the local
%      function named CALLBACK in MAIN.M with the given input arguments.
%
%      MAIN('Property','Value',...) creates a new MAIN or raises the
%      existing singleton*.  Starting from the left, property value pairs are
%      applied to the GUI before main_OpeningFcn gets called.  An
%      unrecognized property name or invalid value makes property application
%      stop.  All inputs are passed to main_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
% Begin initialization code - DO NOT EDIT

gui_Singleton = 1;
gui_State = struct('gui_Name',       mfilename, ...
                   'gui_Singleton',  gui_Singleton, ...
                   'gui_OpeningFcn', @main_OpeningFcn, ...
                   'gui_OutputFcn',  @main_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
% End initialization code - DO NOT EDIT


% --- Executes just before main is made visible.
function main_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 main (see VARARGIN)

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

a=ones(300,512);
axes(handles.axes1);
imshow(a);
axes(handles.axes2);
imshow(a);

% Update handles structure
guidata(hObject, handles);
end



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


% --- Outputs from this function are returned to the command line.
function varargout = main_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;
end

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


a=handles.a;
wavplay(a,44100);
end


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


exit;
end


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


[filename, pathname] = uigetfile('*.wav', 'Pick an audio');
if isequal(filename,0) || isequal(pathname,0)
    warndlg('Audio is not selected');
else
    a=audioread(filename);
    axes(handles.axes1);
    plot(a);
%     disp(a);
    handles.filename=filename;
    handles.a=a;
    guidata(hObject, handles);
    helpdlg('Input audio is Selected');
end
end



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


[filename, pathname] = uigetfile('*.txt', 'Pick any txt file');
if isequal(filename,0) || isequal(pathname,0)
	warndlg('txt file is not selected');
else
    fid = fopen(filename,'r');
	F = fread(fid);
	s = char(F');
	fclose(fid);
end
handles.s=s;
handles.F=F;
guidata(hObject, handles);
helpdlg('Text File is Selected');
end


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


a=handles.a;
s=handles.s;
F=handles.F;

Q_SIZE = 3;
c=round(a*(10^Q_SIZE));
i=1;
ii=51;
while i <=length(s)
	if c(ii,1)<0
        sbit1 = -1;
    else
        sbit1 =  1;
	end
    iii = ii+2;
	if c(iii,1)<0
        sbit2 = -1;
    else
        sbit2 =  1;
	end
	c(ii,1) = abs(c(ii,1));
	c(iii,1) = abs(c(iii,1));
	[c(ii,1),c(iii,1)]=Enc_Char(c(ii,1),c(iii,1),F(i));
	c(ii,1) = sbit1*c(ii,1);
    c(iii,1) = sbit2*c(iii,1);
    i=i+1;
    ii = iii+2;
end
            n  = length(F);  % Input Text Length
			d=c/(10^Q_SIZE);
            axes(handles.axes2);
            plot(d);
			audiowrite(d,44100,16,'Embedded.WAV');
			helpdlg('Embedded process completed');
 
pass=passkey;
s2 = char(pass);
ss = length(s2);
if  ss==4
    helpdlg('Secret Key Sucessesfully added');
else
    errordlg('Enter the Valid Secret Key');
end
num = dec2bin(s2,8);
disp(num);
handles.pass = num;
handles.d=d;
handles.n = n;
guidata(hObject, handles);
end


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


n=handles.n;
pass=handles.pass;
pass1=passkey;
s2 = char(pass1);
ss = length(s2);
if  ss==4
    helpdlg('Secret Key Sucessesfully added');
else
    errordlg('Enter the Valid Secret Key');
end
pass1 = dec2bin(s2,8);
temp=0;
for i=1:4
    for j=1:8
        if pass(i,j)==pass1(i,j)
            temp=temp+1;
        else
            temp = 0;
        end
    end
end

if temp == 32
	%s='A';
	%s1=serial('COM5','BaudRate',9600);
	%fopen(s1);
	%fprintf(s1,s);
	%fclose(s1);
else
    errordlg('Password missmached');
	%s='B';
	%s1=serial('COM5','BaudRate',9600);
	%fopen(s1);
	%fprintf(s1,s);
	%fclose(s1);
	exit;
end
                    
a=wavread('Embedded.wav');
Q_SIZE = 3;
c=round(a*(10^Q_SIZE));

i = 1;
TXT_LENGTH = n;
ii=51;
while i <= TXT_LENGTH
c(ii,1) = abs(c(ii,1));
iii = ii+2;
c(iii,1) = abs(c(iii,1));
s(i)=Dec_Char(c(ii,1),c(iii,1));
i = i+1;
ii = iii+2;
end

fid = fopen('output.txt','wb');
fwrite(fid,char(s'),'char');
fclose(fid);
helpdlg('Extraction process completed');
end


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


open 'output.txt';
end

% --- Executes on button press in playaudio1.
function playaudio1_Callback(hObject, eventdata, handles)
% hObject    handle to playaudio1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

d = handles.d;
wavplay(d,44100);
end


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
end

% --- 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
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
end

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

inpaud = handles.a;
embaud = handles.d;

[Y,Z]=psnr(inpaud,embaud);
set(handles.edit1,'string',Y);
set(handles.edit2,'string',Z);
end

[Datta Sai Raipally]

this is my code....

would u please correct it?

[Image Analyst]

I can't tell what is wrong by looking at hundreds of lines of code -- I need to run it. Attach both the .m and .fig file with the paper clip icon and tell us exactly what needs to be corrected. the only thing wrong with it that I can see right off the bat is that you have not added any comments to explain it. If "correct" means to add comments and fix indentation, we are most likely not going to do that.

[Walter Roberson]

function validation_Callback(hObject, eventdata, handles)
% hObject    handle to validation (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
inpaud = handles.a;
embaud = handles.d;
[Y,Z]=psnr(inpaud,embaud);
set(handles.edit1,'string',Y);
set(handles.edit2,'string',Z);
end

You are using "end" statements corresponding to your "function" statements. GUIDE is not able to handle that. GUIDE requires that you not use "end" for each "function", and that you not use nested functions or shared variables -- at least not for the part of the code being managed by GUIDE.

[Datta Sai Raipally]

what is nested functions

[Walter Roberson]

function varargout = main(varargin)
    % MAIN M-file for main.fig
    %      MAIN, by itself, creates a new MAIN or raises the existing
    %      singleton*.
    %
    %      H = MAIN returns the handle to a new MAIN or the handle to
    %      the existing singleton*.
    %
    %      MAIN('CALLBACK',hObject,eventData,handles,...) calls the local
    %      function named CALLBACK in MAIN.M with the given input arguments.
    %
    %      MAIN('Property','Value',...) creates a new MAIN or raises the
    %      existing singleton*.  Starting from the left, property value pairs are
    %      applied to the GUI before main_OpeningFcn gets called.  An
    %      unrecognized property name or invalid value makes property application
    %      stop.  All inputs are passed to main_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
    % Begin initialization code - DO NOT EDIT
    gui_Singleton = 1;
    gui_State = struct('gui_Name',       mfilename, ...
        'gui_Singleton',  gui_Singleton, ...
        'gui_OpeningFcn', @main_OpeningFcn, ...
        'gui_OutputFcn',  @main_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 main is made visible.
function main_OpeningFcn(hObject,~, 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 main (see VARARGIN)
    % Choose default command line output for main
    handles.output = hObject;
    a=ones(300,512);
    axes(handles.axes1);
    imshow(a);
    axes(handles.axes2);
    imshow(a);
    % Update handles structure
    guidata(hObject, handles);
    
% UIWAIT makes main wait for user response (see UIRESUME)
% uiwait(handles.figure1);
% --- Outputs from this function are returned to the command line.
function varargout = main_OutputFcn(~,~, 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 playaudio.
function playaudio_Callback(~, ~, handles) %#ok<DEFNU>
    % hObject    handle to playaudio (see GCBO)
    % eventdata  reserved - to be defined in a future version of MATLAB
    % handles    structure with handles and user data (see GUIDATA)
    a=handles.a;
    wavplay(a,44100);

% --- Executes on button press in exit.
function exit_Callback(~, ~, ~) %#ok<DEFNU>
    % hObject    handle to exit (see GCBO)
    % eventdata  reserved - to be defined in a future version of MATLAB
    % handles    structure with handles and user data (see GUIDATA)
    exit;

% --- Executes on button press in inputaudio.
function inputaudio_Callback(hObject,~, handles) %#ok<DEFNU>
    % hObject    handle to inputaudio (see GCBO)
    % eventdata  reserved - to be defined in a future version of MATLAB
    % handles    structure with handles and user data (see GUIDATA)
    [filename, pathname] = uigetfile('*.wav', 'Pick an audio');
    if isequal(filename,0) || isequal(pathname,0)
        warndlg('Audio is not selected');
    else
        a=audioread(filename);
        axes(handles.axes1);
        plot(a);
        %     disp(a);
        handles.filename=filename;
        handles.a=a;
        guidata(hObject, handles);
        helpdlg('Input audio is Selected');
    end

% --- Executes on button press in secretdata.
function secretdata_Callback(hObject, ~, handles) %#ok<DEFNU>
    % hObject    handle to secretdata (see GCBO)
    % eventdata  reserved - to be defined in a future version of MATLAB
    % handles    structure with handles and user data (see GUIDATA)
    [filename, pathname] = uigetfile('*.txt', 'Pick any txt file');
    if isequal(filename,0) || isequal(pathname,0)
        warndlg('txt file is not selected');
    else
        fid = fopen(filename,'r');
        F = fread(fid);
        s = char(F');
        fclose(fid);
    end
    handles.s=s;
    handles.F=F;
    guidata(hObject, handles);
    helpdlg('Text File is Selected');

% --- Executes on button press in embedding.
function embedding_Callback(hObject, ~, handles) %#ok<DEFNU>
    % hObject    handle to embedding (see GCBO)
    % eventdata  reserved - to be defined in a future version of MATLAB
    % handles    structure with handles and user data (see GUIDATA)
    a=handles.a;
    s=handles.s;
    F=handles.F;
    Q_SIZE = 3;
    c=round(a*(10^Q_SIZE));
    i=1;
    ii=51;
    while i <=length(s)
        if c(ii,1)<0
            sbit1 = -1;
        else
            sbit1 =  1;
        end
        iii = ii+2;
        if c(iii,1)<0
            sbit2 = -1;
        else
            sbit2 =  1;
        end
        c(ii,1) = abs(c(ii,1));
        c(iii,1) = abs(c(iii,1));
        [c(ii,1),c(iii,1)]=Enc_Char(c(ii,1),c(iii,1),F(i));
        c(ii,1) = sbit1*c(ii,1);
        c(iii,1) = sbit2*c(iii,1);
        i=i+1;
        ii = iii+2;
    end
    n  = length(F);  % Input Text Length
    d=c/(10^Q_SIZE);
    axes(handles.axes2);
    plot(d);
    audiowrite(d,44100,16,'Embedded.WAV');
    helpdlg('Embedded process completed');
    
    pass=passkey;
    s2 = char(pass);
    ss = length(s2);
    if  ss==4
        helpdlg('Secret Key Sucessesfully added');
    else
        errordlg('Enter the Valid Secret Key');
    end
    num = dec2bin(s2,8);
    disp(num);
    handles.pass = num;
    handles.d=d;
    handles.n = n;
    guidata(hObject, handles);

% --- Executes on button press in extraction.
function extraction_Callback(~, ~, handles) %#ok<DEFNU>
    % hObject    handle to extraction (see GCBO)
    % eventdata  reserved - to be defined in a future version of MATLAB
    % handles    structure with handles and user data (see GUIDATA)
    n=handles.n;
    pass=handles.pass;
    pass1=passkey;
    s2 = char(pass1);
    ss = length(s2);
    if  ss==4
        helpdlg('Secret Key Sucessesfully added');
    else
        errordlg('Enter the Valid Secret Key');
    end
    pass1 = dec2bin(s2,8);
    temp=0;
    for i=1:4
        for j=1:8
            if pass(i,j)==pass1(i,j)
                temp=temp+1;
            else
                temp = 0;
            end
        end
    end
    if temp == 32
        %s='A';
        %s1=serial('COM5','BaudRate',9600);
        %fopen(s1);
        %fprintf(s1,s);
        %fclose(s1);
    else
        errordlg('Password missmached');
        %s='B';
        %s1=serial('COM5','BaudRate',9600);
        %fopen(s1);
        %fprintf(s1,s);
        %fclose(s1);
        exit;
    end
    
    a=audioreader('Embedded.wav');
    Q_SIZE = 3;
    c=round(a*(10^Q_SIZE));
    i = 1;
    TXT_LENGTH = n;
    ii=51;
    s = zeros(1,TXT_LENGTH);
    while i <= TXT_LENGTH
        c(ii,1) = abs(c(ii,1));
        iii = ii+2;
        c(iii,1) = abs(c(iii,1));
        s(i)=Dec_Char(c(ii,1),c(iii,1));
        i = i+1;
        ii = iii+2;
    end
    fid = fopen('output.txt','wb');
    fwrite(fid,char(s'),'char');
    fclose(fid);
    helpdlg('Extraction process completed');

% --- Executes on button press in viewoutput.
function viewoutput_Callback(~, ~, ~) %#ok<DEFNU>
    % hObject    handle to viewoutput (see GCBO)
    % eventdata  reserved - to be defined in a future version of MATLAB
    % handles    structure with handles and user data (see GUIDATA)
    open 'output.txt';

% --- Executes on button press in playaudio1.
function playaudio1_Callback(~, ~, handles) %#ok<DEFNU>
    % hObject    handle to playaudio1 (see GCBO)
    % eventdata  reserved - to be defined in a future version of MATLAB
    % handles    structure with handles and user data (see GUIDATA)
    d = handles.d;
    sound(d,44100);

function edit1_Callback(~, ~, ~) %#ok<DEFNU>
    % 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, ~, ~) %#ok<DEFNU>
    % 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(~, ~, ~) %#ok<DEFNU>
    % 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, ~, ~) %#ok<DEFNU>
    % 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

% --- Executes on button press in validation.
function validation_Callback(~, ~, handles) %#ok<DEFNU>
    % hObject    handle to validation (see GCBO)
    % eventdata  reserved - to be defined in a future version of MATLAB
    % handles    structure with handles and user data (see GUIDATA)
    inpaud = handles.a;
    embaud = handles.d;
    [Y,Z]=psnr(inpaud,embaud);
    set(handles.edit1,'string',Y);
    set(handles.edit2,'string',Z);

[Walter Roberson]

https://www.mathworks.com/help/matlab/matlab_prog/nested-functions.html

[Datta Sai Raipally]

sir...its getting too many errors

[Datta Sai Raipally]

sir..can I get ur mail please..I will send the complete code...please

[Walter Roberson]

No. I give public answers to public questions.

[MAYUR KULAM]

In the above code i am getting this error

[Walter Roberson]

Enc_Char is not part of MATLAB. You will need to write it yourself or find place that it is already written such as the place you found Dec_Char

[MAYUR KULAM]

Dec_char is also giving error as undeclared variable

[Walter Roberson]

Dec_char is not present in your posted code. Your code refers to Dec_Char. We can see from your screen shot that you do not Dec_Char.m in your current directory.

[MAYUR KULAM]

when i write a function for Enc_Char it gies me the following error

[Walter Roberson]

No. You should review your documentation about what Dec_Char and Enc_Char are expected to do, and you write functions that do those tasks.

[MAYUR KULAM]

when i write the code in the function Enc_Char and Dec_Char and call it in imp.m then the above error occurs saying Execution of script Enc_Char as a function is not supported is there anyother way i can use it in my main code itself

[Walter Roberson]

Remember that in MATLAB, there are three different types of .m files:

• a file in which the first non-comment is "function" is a function file
• a file in which the first non-comment is "classdef" is a class definition
• all other .m files are "script" files

The message is telling you that Dec_Char is a script file. It either has no "function" at all or else it has some code before the "function" statement. You need to fix the file to be a function file. (A file that contains only comments would also be considered a script file)

Answer 2

[SRT HellKitty]

I'm not sure this will fix the error you are encountering, but when you set a textbox you need to use this context;

set(handles.edit1,'String','ok')

Answer 3

[Image Analyst]

In GUIDE, right click on the button and say "View Callbacks -> Callback". This will create the callback function that you need, and which your program is trying to execute but that does not exist yet (until you create it).

And get rid of the "end" statements in PME_app2_OpeningFcn() and pushbutton1_Callback().

If that doesn't work, also attach the .m file so we can fix it.

[qiana curcuru]

I tried that, but it still didn't work, but I attached the original .m file. Thank you!!

[Image Analyst]

Well it did work because the "ends" were making your function a nested function and you told Walter that once you fixed that, it worked.