I am getting a error to do with gui_mainfcn & gui_name

I'm new to programming, I was attempting to make a snake clone using a guide. When I was trying to make the scoring sytem work I began to get this error no matter what I do:

Error using gui_mainfcn (line 40)

Could not find field 'gui_Name' in the gui_State struct in GUI MATLAB-file

Error in snake_g (line 42)

gui_mainfcn(gui_State, varargin{:});

If it helps at all here is my code thus far, thank you in advance for you help and time:

function varargout = snake_g(varargin)

% SNAKE_G MATLAB code for snake_g.fig

% SNAKE_G, by itself, creates a new SNAKE_G or raises the existing

% singleton*.

%

% H = SNAKE_G returns the handle to a new SNAKE_G or the handle to

% the existing singleton*.

%

% SNAKE_G('CALLBACK',hObject,eventData,handles,...) calls the local

% function named CALLBACK in SNAKE_G.M with the given input arguments.

%

% SNAKE_G('Property','Value',...) creates a new SNAKE_G or raises the

% existing singleton*. Starting from the left, property value pairs are

% applied to the GUI before snake_g_OpeningFcn gets called. An

% unrecognized property name or invalid value makes property application

% stop. All inputs are passed to snake_g_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 snake_g

% Last Modified by GUIDE v2.5 09-May-2020 21:24:40

% Begin initialization code - DO NOT EDIT

gui_Singleton = 1;

gui_State = struct('gui_Name', mfilename, ...

'gui_Singleton', gui_Singleton, ...

'gui_OpeningFcn', @snake_g_OpeningFcn, ...

'gui_OutputFcn', @snake_g_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 snake_g is made visible.

function snake_g_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 snake_g (see VARARGIN)

% Choose default command line output for snake_g

handles.output = hObject;

% Update handles structure

guidata(hObject, handles);

% UIWAIT makes snake_g wait for user response (see UIRESUME)

% uiwait(handles.figure1);

axes(handles.axes1);

axis('off');

% --- Outputs from this function are returned to the command line.

function varargout = snake_g_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;

start_game_Callback(hObject, eventdata, handles);

% --- Executes on button press in up.

function up_Callback(hObject, eventdata, handles)

% hObject handle to up (see GCBO)

% eventdata reserved - to be defined in a future version of MATLAB

% handles structure with handles and user data (see GUIDATA)

global direction move_status;

if ~(direction==4)

direction=2;

move_status=1;

end

% --- Executes on button press in right.

function right_Callback(hObject, eventdata, handles)

% hObject handle to right (see GCBO)

% eventdata reserved - to be defined in a future version of MATLAB

% handles structure with handles and user data (see GUIDATA)

global direction move_status;

if ~(direction==3)

direction=1;

move_status=1;

end

% --- Executes on button press in down.

function down_Callback(hObject, eventdata, handles)

% hObject handle to down (see GCBO)

% eventdata reserved - to be defined in a future version of MATLAB

% handles structure with handles and user data (see GUIDATA)

global direction move_status;

if ~(direction==2)

direction=4;

move_status=1;

end

% --- Executes on button press in left.

function left_Callback(hObject, eventdata, handles)

% hObject handle to left (see GCBO)

% eventdata reserved - to be defined in a future version of MATLAB

% handles structure with handles and user data (see GUIDATA)

global direction move_status;

if ~(direction==1)

direction=3;

move_status=1;

end

% --- Executes on button press in pause.

function pause_Callback(hObject, eventdata, handles)

% hObject handle to pause (see GCBO)

% eventdata reserved - to be defined in a future version of MATLAB

% handles structure with handles and user data (see GUIDATA)

global move_status;

move_status=0;

% --- Executes on button press in start_game.

function start_game_Callback(hObject, eventdata, handles)

% hObject handle to start_game (see GCBO)

% eventdata reserved - to be defined in a future version of MATLAB

% handles structure with handles and user data (see GUIDATA)

global mat_r mat_g mat_b;

global direction; direction=2;

global points;points=0;

global move_status; move_status=0;

t=0.1;

locx=[50 50 50 50 50 50 50 50 50];

locy=[60 61 62 63 64 65 66 67 68];

mat_r=zeros(100,100);

mat_g=zeros(100,100);

mat_b=zeros(100,100);

update_snake(locx,locy);

while(1)

pt_x=randperm(size(mat_r,1),1);

pt_y=randperm(size(mat_r,1),1);

if sum(locx==pt_x & locy==pt_y)==0

break;

end

end

mat_r(pt_x,pt_y)=255;

mat_g(pt_x,pt_y)=255;

mat_b(pt_x,pt_y)=255;

imshow(uint8(cat(3,mat_r,mat_g,mat_b)));

while(1)

imshow(uint8(cat(3,mat_r,mat_g,mat_b)));

pause(t);

if(move_status)

len=length(locx);

for i=1:len

mat_r(locx(i),locy(i))=0;

mat_g(locx(i),locy(i))=0;

mat_b(locx(i),locy(i))=0;

end

if sum((locx(1)==pt_x) & (locy(1)==pt_y))==1

locx(2:len+1)=locx(1:len);

locy(2:len+1)=locy(1:len);

while(1)

pt_x=randperm(size(mat_r,1),1);

pt_y=randperm(size(mat_r,1),1);

if sum(locx==pt_x & locy==pt_y)==0

break;

end

end

mat_r(pt_x,pt_y)=255;

mat_g(pt_x,pt_y)=255;

mat_b(pt_x,pt_y)=255;

points=points+1;

set(handles.score,'String',num2str(points));

else

locx(2:len)=locx(1:len-1);

locy(2:len)=locy(1:len-1);

end

if direction==1

if locy(1)==100

locy(1)=1;

else

locy(1)=locy(1)+1;

end

elseif direction==2

if locx(1)==1

locx(1)=100;

else

locx(1)=locx(1)-1;

end

elseif direction==3

if locy(1)==1

locy(1)=100;

else

locy(1)=locy(1)-1;

end

elseif direction==4

if locx(1)==100

locx(1)=1;

else

locx(1)=locx(1)+1;

end

end

if sum((locx(2:end)==locx(1)) & (locy(2:end)==locy(1)))

mat_r(:,:)=255;

mat_g(:,:)=0;

mat_b(:,:)=0;

imshow(uint8(cat(3,mat_r,mat_g,mat_b)));

msgbox('Game over..!');

break;

end

update_snake(locx,locy);

if points==5

t=0.08;

elseif points==10

t=0.05;

elseif points==15

t=0.03;

elseif points==30

t=0.01;

elseif points==50

t=0.008;

end

end

end

% --- Executes on button press in end_game.

function end_game_Callback(hObject, eventdata, handles)

% hObject handle to end_game (see GCBO)

% eventdata reserved - to be defined in a future version of MATLAB

% handles structure with handles and user data (see GUIDATA)

close;

function update_snake(locx,locy)

global mat_r mat_g mat_b

mat_r(locx(1),locy(1))=255;

mat_g(locx(1),locy(1))=0;

mat_b(locx(1),locy(1))=0;

for i=2:length(locx)

mat_r(locx(i),locy(i))=0;

mat_g(locx(i),locy(i))=255;

mat_b(locy(i),locy(i))=0;

end

% --- Executes on key press with focus on figure1 and none of its controls.

function figure1_KeyPressFcn(hObject, eventdata, handles)

% hObject handle to figure1 (see GCBO)

% eventdata structure with the following fields (see MATLAB.UI.FIGURE)

% Key: name of the key that was pressed, in lower case

% Character: character interpretation of the key(s) that was pressed

% Modifier: name(s) of the modifier key(s) (i.e., control, shift) pressed

% handles structure with handles and user data (see GUIDATA)

global direction move_status;

switch(eventdata.Key)

case 'uparrow'

if ~(direction==4)

direction=2;

move_status=1;

end

case 'downarrow'

if ~(direction==2)

direction=4;

move_status=1;

end

case 'rightarrow'

if ~(direction==3)

direction=1;

move_status=1;

end

case 'leftarrow'

if ~(direction==1)

direction=3;

move_status=1;

end

case 'return'

move_status=0;

otherwise

direction=direction;

move_status=1;

end

[Image Analyst]

Can you just attach the .fig file and the .m file both with the paperclip icon? That way we can run it.

[Pete]

I have attached both

[Geoff Hayes]

@Pete - how is the score determined? If the snake captures the white icon is a point awarded? Please clarify. I don't see the above error when I run your code. I do see a couple of while loops in the code. I would recommend using a timer instead (to update the game board which is partly what I think your loop is doing).