Matlab Guide Button Glitch- - matlab

Question

I am trying to make it such that I display an average of four numbers and a function which takes the average as its input. However, if a pushbutton is pressed I want the function to display "0". Below is my attempt, but the problem is that I am attempting to store the state of the button in handles.button_state but my value does not seem to store properly, as the global variable stays to my initialized value of false, and the problem is that my if statement to either display the function or the value "0" always displays the value of the function if I press my "calculate" button more than once, instead of staying "0" if the button is pressed.
function varargout = Real2(varargin)
% REAL2 MATLAB code for Real2.fig
% REAL2, by itself, creates a new REAL2 or raises the existing
% singleton*.
%
% H = REAL2 returns the handle to a new REAL2 or the handle to
% the existing singleton*.
%
% REAL2('CALLBACK',hObject,eventData,handles,...) calls the local
% function named CALLBACK in REAL2.M with the given input arguments.
%
% REAL2('Property','Value',...) creates a new REAL2 or raises the
% existing singleton*. Starting from the left, property value pairs are
% applied to the GUI before Real2_OpeningFcn gets called. An
% unrecognized property name or invalid value makes property application
% stop. All inputs are passed to Real2_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 Real2
% Last Modified by GUIDE v2.5 07-Feb-2017 18:09:44
% Begin initialization code - DO NOT EDIT
gui_Singleton = 1;
gui_State = struct('gui_Name', mfilename, ...
'gui_Singleton', gui_Singleton, ...
'gui_OpeningFcn', #Real2_OpeningFcn, ...
'gui_OutputFcn', #Real2_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 Real2 is made visible.
function Real2_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 Real2 (see VARARGIN)
% Choose default command line output for Real2
handles.output = hObject;
% Update handles structure
guidata(hObject, handles);
initialize_gui(hObject, handles, false);
% UIWAIT makes Real2 wait for user response (see UIRESUME)
% uiwait(handles.figure1);
% --- Outputs from this function are returned to the command line.
function varargout = Real2_OutputFcn(hObject, eventdata, handles)
% Get default command line output from handles structure
varargout{1} = handles.output;
%-----------------------------------------------------------------------------------%
function Number1_Callback(hObject, eventdata, handles)
Number1 = str2double(get(hObject, 'String'));
handles.metricdata.Number1 = Number1;
guidata(hObject,handles)
% --- Executes during object creation, after setting all properties.
function Number1_CreateFcn(hObject, eventdata, handles)
if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
set(hObject,'BackgroundColor','white');
end
%-----------------------------------------------------------------------------------%
function Number2_Callback(hObject, eventdata, handles)
Number2 = str2double(get(hObject, 'String'));
handles.metricdata.Number2 = Number2;
guidata(hObject,handles)
% --- Executes during object creation, after setting all properties.
function Number2_CreateFcn(hObject, eventdata, handles)
if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
set(hObject,'BackgroundColor','white');
end
%-----------------------------------------------------------------------------------%
function Number3_Callback(hObject, eventdata, handles)
Number3 = str2double(get(hObject, 'String'));
handles.metricdata.Number3 = Number3;
guidata(hObject,handles)
% --- Executes during object creation, after setting all properties.
function Number3_CreateFcn(hObject, eventdata, handles)
if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
set(hObject,'BackgroundColor','white');
end
function Number4_Callback(hObject, eventdata, handles)
Number4 = str2double(get(hObject, 'String'));
handles.metricdata.Number4 = Number4;
guidata(hObject,handles)
% --- Executes during object creation, after setting all properties.
function Number4_CreateFcn(hObject, eventdata, handles)
if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
set(hObject,'BackgroundColor','white');
end
%-----------------------------------------------------------------------------------%
% --------------------------------------------------------------------
% --- Executes on button press in Togz.
function Togz_Callback(hObject, eventdata, handles)
% hObject handle to Togz (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
% Hint: get(hObject,'Value') returns toggle state of Togz
button_state = get(hObject,'Value');
handles.button_state = button_state;
set(handles.funcz, 'String', 0);
%-----------------------------------------------------------------------------------%
% --- 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)
average = (handles.metricdata.Number1+handles.metricdata.Number2+handles.metricdata.Number3+handles.metricdata.Number4)/4;
funcz= 2*average^2-3*average+2;
set(handles.average, 'String', average);
if handles.button_state==true
set(handles.funcz, 'String', 0);
else
set(handles.funcz, 'String', funcz);
end
function initialize_gui(fig_handle, handles, isreset)
% If the metricdata field is present and the reset flag is false, it means
% we are we are just re-initializing a GUI by calling it from the cmd line
% while it is up. So, bail out as we dont want to reset the data.
if isfield(handles, 'metricdata') && ~isreset
return;
end
handles.metricdata.Number1 = 0;
handles.metricdata.Number2 = 0;
handles.metricdata.Number3 = 0;
handles.metricdata.Number4 = 0;
handles.button_state = false;
set(handles.Number1, 'String', handles.metricdata.Number1);
set(handles.Number2, 'String', handles.metricdata.Number2);
set(handles.Number3, 'String', handles.metricdata.Number3);
set(handles.Number4, 'String', handles.metricdata.Number4);
set(handles.funcz, 'String', 1);
set(handles.average, 'String', 0);
% Update handles structure
guidata(handles.figure1, handles);

Answer 1

handles is not a global variable but rather it is stored within the figure itself and automatically passed to all callbacks as the third input. If you want to make a modification to the handles structure, you have to save the changes to the handles structure by re-assigning it to the figure using guidata.
% Change the value
handles.button_state = button_state;
% "Save" these changes
guidata(hObject, handles)