why do i get these errors

No appropriate method, property, or field 'string' for class 'matlab.ui.control.UIControl'.

Error in untitled1>btn_forward_Callback (line 150)

Th_1 = str2double(handles.Theta_1.string)*pi/180;

Error in gui_mainfcn (line 95)

feval(varargin{:});

Error in untitled1 (line 42)

gui_mainfcn(gui_State, varargin{:});

Error in @(hObject,eventdata)untitled1('btn_forward_Callback',hObject,eventdata,guidata(hObject))

Error while evaluating UIControl Callback

here is the code

function varargout = untitled1(varargin)

% UNTITLED1 MATLAB code for untitled1.fig

% UNTITLED1, by itself, creates a new UNTITLED1 or raises the existing

% singleton*.

%

% H = UNTITLED1 returns the handle to a new UNTITLED1 or the handle to

% the existing singleton*.

%

% UNTITLED1('CALLBACK',hObject,eventData,handles,...) calls the local

% function named CALLBACK in UNTITLED1.M with the given input arguments.

%

% UNTITLED1('Property','Value',...) creates a new UNTITLED1 or raises the

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

% applied to the GUI before untitled1_OpeningFcn gets called. An

% unrecognized property name or invalid value makes property application

% stop. All inputs are passed to untitled1_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 untitled1

% Last Modified by GUIDE v2.5 16-Dec-2018 22:14:51

% Begin initialization code - DO NOT EDIT

gui_Singleton = 1;

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

'gui_Singleton', gui_Singleton, ...

'gui_OpeningFcn', @untitled1_OpeningFcn, ...

'gui_OutputFcn', @untitled1_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 untitled1 is made visible.

function untitled1_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 untitled1 (see VARARGIN)

% Choose default command line output for untitled1

handles.output = hObject;

% Update handles structure

guidata(hObject, handles);

% UIWAIT makes untitled1 wait for user response (see UIRESUME)

% uiwait(handles.figure1);

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

function varargout = untitled1_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;

function Theta_1_Callback(~, ~, ~)

% hObject handle to Theta_1 (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 Theta_1 as text

% str2double(get(hObject,'String')) returns contents of Theta_1 as a double

% --- Executes during object creation, after setting all properties.

function Theta_1_CreateFcn(hObject, ~, ~)

% hObject handle to Theta_1 (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 Theta_2_Callback(~, ~, ~)

% hObject handle to Theta_2 (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 Theta_2 as text

% str2double(get(hObject,'String')) returns contents of Theta_2 as a double

% --- Executes during object creation, after setting all properties.

function Theta_2_CreateFcn(hObject, ~, ~)

% hObject handle to Theta_2 (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 Theta_3_Callback(~, ~, ~)

% hObject handle to Theta_3 (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 Theta_3 as text

% str2double(get(hObject,'String')) returns contents of Theta_3 as a double

% --- Executes during object creation, after setting all properties.

function Theta_3_CreateFcn(hObject, eventdata, handles)

% hObject handle to Theta_3 (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 btn_forward.

function btn_forward_Callback(hObject, eventdata, handles)

% hObject handle to btn_forward (see GCBO)

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

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

Th_1 = str2double(handles.Theta_1.string)*pi/180;

Th_2 = str2double(handles.Theta_2.string)*pi/180;

Th_3 = str2double(handles.Theta_3.string)*pi/180;

L_1 = 20;

L_2 = 50;

L_3 = 40;

L(1) = link([0 L_1 0 pi/2]);

L(2) = link([0 0 L_2 0]);

L(3) = link([0 0 L_3 0]);

Robot = serialLink(L);

Robot.name = 'RRR_Robot';

Robot.plot([Th_1 Th_2 Th_3]);

T = Robot.fkine([Th_1 Th_2 Th_3]);

handles.Pos_X.string = num2str(floor(T(1,4)));

handles.Pos_Y.string = num2str(floor(T(2,4)));

handles.Pos_Z.string = num2str(floor(T(3,4)));

function Pos_X_Callback(hObject, eventdata, handles)

% hObject handle to Pos_X (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 Pos_X as text

% str2double(get(hObject,'String')) returns contents of Pos_X as a double

% --- Executes during object creation, after setting all properties.

function Pos_X_CreateFcn(hObject, eventdata, handles)

% hObject handle to Pos_X (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 Pos_Y_Callback(hObject, eventdata, handles)

% hObject handle to Pos_Y (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 Pos_Y as text

% str2double(get(hObject,'String')) returns contents of Pos_Y as a double

% --- Executes during object creation, after setting all properties.

function Pos_Y_CreateFcn(hObject, eventdata, handles)

% hObject handle to Pos_Y (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 Pos_Z_Callback(hObject, eventdata, handles)

% hObject handle to Pos_Z (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 Pos_Z as text

% str2double(get(hObject,'String')) returns contents of Pos_Z as a double

% --- Executes during object creation, after setting all properties.

function Pos_Z_CreateFcn(hObject, eventdata, handles)

% hObject handle to Pos_Z (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 btn_invese.

function btn_invese_Callback(hObject, eventdata, handles)

% hObject handle to btn_invese (see GCBO)

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

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

Answer 1

[Walter Roberson]

uicontrol property names all begin with capital letters . The property name is String not string