MATLAB: MatLab GUI Question: Make non-editable textboxes

Hi guys,
I have a test GUI code below (from a .m file which I got when I used the GUIDE wizard). Is there a way to make the textbox on the right be a "non-editable" field, and just be a field where I am able to output a value and not allow user to edit it?
Thank you
function varargout = TestInterface(varargin)
% TESTINTERFACE Application M-file for TestInterface.fig
%   TESTINTERFACE, by itself, creates a new TESTINTERFACE or raises the existing
%   singleton*.
%




%   H = TESTINTERFACE returns the handle to a new TESTINTERFACE or the handle to
%   the existing singleton*.
%
%   TESTINTERFACE('CALLBACK',hObject,eventData,handles,...) calls the local
%   function named CALLBACK in TESTINTERFACE.M with the given input arguments.
%
%   TESTINTERFACE('Property','Value',...) creates a new TESTINTERFACE or raises the
%   existing singleton*.  Starting from the left, property value pairs are
%   applied to the GUI before two_axes_OpeningFunction gets called.  An
%   unrecognized property name or invalid value makes property application
%   stop.  All inputs are passed to TestInterface_OpeningFcn via varargin.
%
%   *See GUI Options - GUI allows only one instance to run (singleton).
%
% See also: GUIDE, GUIDATA, GUIHANDLES
% Edit the above text to modify the response to help TestInterface
% Copyright 2001-2006 The MathWorks, Inc.
% Last Modified by GUIDE v2.5 31-May-2015 00:38:11
% Begin initialization code - DO NOT EDIT
gui_Singleton = 1;
gui_State = struct('gui_Name',          mfilename, ...
                   'gui_Singleton',     gui_Singleton, ...
                   'gui_OpeningFcn',    @TestInterface_OpeningFcn, ...
                   'gui_OutputFcn',     @TestInterface_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 TestInterface is made visible.
function TestInterface_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 TestInterface (see VARARGIN)
% Choose default command line output for TestInterface
handles.output = hObject;
% Update handles structure
guidata(hObject, handles);
% UIWAIT makes TestInterface wait for user response (see UIRESUME)
% uiwait(handles.figure1);
% --- Outputs from this function are returned to the command line.
function varargout = TestInterface_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 plot_button_Callback(hObject, eventdata, handles, varargin)
% hObject    handle to plot_button (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
set(0,'DefaultFigureColor','White',...
     'defaultaxesfontsize',8,...
     'DefaultAxesFontname','Calibri',...
     'DefaultTextFontName','Calibri')
x = [0:20];
y = [0:20];
% Get user input from GUI
f1 = str2double(get(handles.f1_input,'String'));
f2 = str2double(get(handles.f2_input,'String'));
constant = str2double(get(handles.constant,'String'));
% Calculate data
TestFormula = @(x,y)(x + y.*constant);
[X,Y] = meshgrid(x,y);
Z1 = TestFormula(X,Y);
Z2 = TestFormula(f1,f2);
% Create frequency plot in proper axes
%plot(handles.frequency_axes,f,m(1:257))
s1 = surf(X,Y,Z1)
set(handles.edit5,'String',Z2)
xlabel('X', 'fontweight', 'bold')
ylabel('Y', 'fontweight', 'bold')
%title('(A)', 'FontSize', 12, 'fontweight', 'bold')
view (135,15);
yh = get(gca,'YLabel'); % Handle of the y label
set(yh, 'Units', 'Normalized')
pos = get(yh, 'Position');
set(yh, 'Position',pos.*[0.85,0.6,1],'Rotation',-10.9)
xh = get(gca,'XLabel'); % Handle of the x label
set(xh, 'Units', 'Normalized')
pos = get(xh, 'Position');
set(xh, 'Position',pos.*[1,1,1],'Rotation',11.1)
zlabel('Z', 'fontweight', 'bold')
zh = get(gca,'ZLabel'); % Handle of the z label
set(zh, 'Units', 'Normalized')
pos = get(zh, 'Position');
set(zh, 'Position',pos.*[1.5,1,0],'Rotation',90)
%set(handles.frequency_axes,'XMinorTick','on')
axis tight
camlight
lighting phong
shading interp
set(s1,'FaceColor',[0 0.63 0.91], 'edgecolor',[0 0 0.4],'meshstyle','both','linewidth',.15);
grid on
function f1_input_Callback(hObject, eventdata, handles)
% hObject    handle to f1_input (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 f1_input as text

%        str2double(get(hObject,'String')) returns contents of f1_input

%        as a double

% Validate that the text in the f1 field converts to a real number
f1 = str2double(get(hObject,'String'));
if isnan(f1) || ~isreal(f1)  
    % isdouble returns NaN for non-numbers and f1 cannot be complex
    % Disable the Plot button and change its string to say why


    set(handles.plot_button,'String','Cannot plot f1')
    set(handles.plot_button,'Enable','off')
    % Give the edit text box focus so user can correct the error


    uicontrol(hObject)
else 
    % Enable the Plot button with its original name


    set(handles.plot_button,'String','Plot')
    set(handles.plot_button,'Enable','on')
end
function f2_input_Callback(hObject, eventdata, handles)
% hObject    handle to f2_input (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 f1_input as text
%        str2double(get(hObject,'String')) returns contents of f1_input
%        as a double
% Validate that the text in the f2 field converts to a real number
f2 = str2double(get(hObject,'String'));
if isnan(f2) ...          % isdouble returns NaN for non-numbers
        || ~isreal(f2)    % f1 should not be complex

    % Disable the Plot button and change its string to say why
    set(handles.plot_button,'String','Cannot plot f2')
    set(handles.plot_button,'Enable','off')
    % Give the edit text box focus so user can correct the error
    uicontrol(hObject)
else 
    % Enable the Plot button with its original name
    set(handles.plot_button,'String','Plot')
    set(handles.plot_button,'Enable','on')
end
function edit5_Callback(hObject, eventdata, handles)
% hObject    handle to edit5 (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 edit5 as text
%        str2double(get(hObject,'String')) returns contents of edit5 as a double
% --- Executes during object creation, after setting all properties.

function edit5_CreateFcn(hObject, eventdata, handles)
% hObject    handle to edit5 (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 constant_Callback(hObject, eventdata, handles)
% hObject    handle to constant (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 constant as text
%        str2double(get(hObject,'String')) returns contents of constant as a double
constant = str2double(get(hObject,'String'));
if isnan(constant) ...          % isdouble returns NaN for non-numbers
        || ~isreal(constant)    % f1 should not be complex
    % Disable the Plot button and change its string to say why
    set(handles.plot_button,'String','Cannot plot constant')
    set(handles.plot_button,'Enable','off')
    % Give the edit text box focus so user can correct the error
    uicontrol(hObject)
else 
    % Enable the Plot button with its original name
    set(handles.plot_button,'String','Plot')
    set(handles.plot_button,'Enable','on')
end
% --- Executes during object creation, after setting all properties.
function constant_CreateFcn(hObject, eventdata, handles)
% hObject    handle to constant (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
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