May I know what is this error? in gui to stress-strain model in for-end

function varargout = dmmGUI210530(varargin)
% DMMGUI210530 MATLAB code for dmmGUI210530.fig
%      DMMGUI210530, by itself, creates a new DMMGUI210530 or raises the existing
%      singleton*.
%
%      H = DMMGUI210530 returns the handle to a new DMMGUI210530 or the handle to
%      the existing singleton*.
%
%      DMMGUI210530('CALLBACK',hObject,eventData,handles,...) calls the local
%      function named CALLBACK in DMMGUI210530.M with the given input arguments.
%
%      DMMGUI210530('Property','Value',...) creates a new DMMGUI210530 or raises the
%      existing singleton*.  Starting from the left, property value pairs are
%      applied to the GUI before dmmGUI210530_OpeningFcn gets called.  An
%      unrecognized property name or invalid value makes property application
%      stop.  All inputs are passed to dmmGUI210530_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 dmmGUI210530

% Last Modified by GUIDE v2.5 19-Jan-2022 17:36:10

% Begin initialization code - DO NOT EDIT
gui_Singleton = 1;
gui_State = struct('gui_Name',       mfilename, ...
                   'gui_Singleton',  gui_Singleton, ...
                   'gui_OpeningFcn', @dmmGUI210530_OpeningFcn, ...
                   'gui_OutputFcn',  @dmmGUI210530_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 dmmGUI210530 is made visible.
function dmmGUI210530_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 dmmGUI210530 (see VARARGIN)

% Choose default command line output for dmmGUI210530
handles.output = hObject;

% Update handles structure
guidata(hObject, handles);

% UIWAIT makes dmmGUI210530 wait for user response (see UIRESUME)
% uiwait(handles.figure1);


% --- Outputs from this function are returned to the command line.
function varargout = dmmGUI210530_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 velocity_Callback(hObject, eventdata, handles)


% --- Executes during object creation, after setting all properties.
function velocity_CreateFcn(hObject, eventdata, handles)
% 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 Distance_Callback(hObject, eventdata, handles)



% --- Executes during object creation, after setting all properties.
function Distance_CreateFcn(hObject, eventdata, handles)
% 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 Button.
function StartButton_Callback(hObject, eventdata, handles)

% set(handles.Filename,'String',string(datetime('now','Format','yyyyMMdd_0')));

newobjs = instrfind; %usb로 값 읽어들이기 시작
if isempty(newobjs) == 0
    fclose(newobjs);
    delete(newobjs);
    clear newobjs
end
% 
% DutAddr = 'GPIB0::22::INSTR';  %String for GPIB의 adress를 DutAddr에 저장
% 
% %connects with instrument and configures
% myDmm = visa('agilent',DutAddr); %myDmm에 DutAddr 입력하여 디지털 멀티미터 동작할 수 있게 설정
% set(myDmm,'EOSMode','read&write'); % read&write 동작 하도록 멀티미터 setting
% set(myDmm,'EOSCharCode','LF') ;
% fopen(myDmm);
% 
% 
% %Configure for DCV 1V range, 100uV resolution
% fprintf(myDmm,'CONF:VOLT:DC 10, 0.0001'); %digital multimeter 화면에 나오는 부분 설정
%                                             % DC voltage, 최대 단위 10, 최소 단위
%                                             % 0.0001V까지 나타나도록 설정


v = str2double(get(handles.velocity, 'String'));    %GUI에서 velocity값 읽어와서 v에 저장
% s = str2double(get(handles.sampling,'String')); % s=500; GUI에서 sampling값 읽어와서 s에 저장
D = str2double(get(handles.Diameter, 'String')); %GUI에서 diameter값 읽어와서 D에 저장



name = get(handles.Filename,'String'); % name = '원하는 이름 설정', GUI에서 설정한 파일 이름 읽어와서 name에 저장
file = '.xls'; %엑셀파일로 저장하기 위한 부분



loadcell = serial('COM3', 'BaudRate', 9600);
fopen(loadcell);
pause(2);
direction=get(handles.direction,'Value');
switch direction
    case 1
        direction="UP\n";
    case 2
        direction="DOWN\n";
    case 3
        direction="RE";
end
loadcell_speed=num2str(100/str2double(get(handles.velocity,'String')));
%loadcell_speed=get(handles.velocity,'String');
fprintf(loadcell,direction);
fprintf(loadcell, loadcell_speed);
fprintf(loadcell,'\n');
%time=num2str(4./str2double(get(handles.velocity,'String'))*str2double(get(handles.distance,'String'));
%time = num2str(100./4*(str2double(get(handles.velocity, 'string'))).\str2double(get(handles.distance, 'string'))*1000)
%거리 / 속력
time = num2str((100/str2double(get(handles.velocity,'String'))).\str2double(get(handles.distance, 'string'))*1000*(10/4));
time='1000';

fprintf(loadcell, time);
fprintf('%s ms\n',time);

tStart = tic; %timer 시작 함수
disp("타이머시작")

t=0;

delta_L=0;

for

Invalid expression. Check for missing or extra characters.

    vec(i) = str2double(query(myDmm, 'READ?')); %vec(i)번째에 읽어들인 값 저장
    disp(vec(i)./10);

    
    tEnd(i) = toc(t_sampling); % 측정된 시간 tEnd에 저장, 10000/2로 실제 초와 같게 설정
    
    delta_L = delta_L+tEnd(i)*v;
    L(i) = delta_L; %모터가 움직이는 시간에 따라 모터가 움직인 거리 설정 (속력*시간 = 거리)
end

fprintf('Approximately %f sec.\n', toc(tStart)); % 최종적으로 걸린 시간 출력
fprintf('%s\n',fscanf(loadcell,'%[^\n]%*s'));
disp()

fclose(loadcell);


A = pi*(D/2)^2*10^(-6); %읽어들인 D(diameter)값으로 단면적A 계산

data_volt = [vec']; %vec배열을 data_volt 에 저장
data_time = [tEnd']; %tEnd배열을 data_time에 저장
delta_Length = [L']; %L배열을 data_time에 저장

data_cell = horzcat(data_time, delta_Length, data_volt*4.6083); %data_time, data_length, data_volt를 세로로 합침
                                                                    %1열+1열+1열=3열
                                                                    %data_volt에0.00456을곱하여voltage->Newton:calibration
                                                                    %data_volt*0.00456/A
xlswrite(strcat(name, file), data_cell); % make excel sheet

%plot


%figure,
%plot(L,vec*4.6083) %1V=4.56g=0.00456N (1kg=9.8N), L = delta length ***나중에 vec*0.00456/A로 바꿔주세영
title('F-Length Graph')
xlabel('Length(mm)')
ylabel('F(N)') %**F/A(Pa)
grid on
% for i=5:10
% M=movmean(vec*0.46083,i*10);
% figure,
% plot(L,M) %  (1kg=9.8N), L = delta length ***나중에 vec*0.00456/A로 바꿔주세영
% title('F-Length Graph')
% xlabel('Length(mm)')
% ylabel('F(N)') %**F/A(Pa)
% grid on
% end
M=movmean(vec*4.6083,100);
%figure,
%plot(L,M) %1V=4.56g=0.00456N (1kg=9.8N), L = delta length ***나중에 vec*0.00456/A로 바꿔주세영
title('F-Length Graph')
xlabel('Length(mm)')
ylabel('F(N)') %**F/A(Pa)
grid on



function Filename_Callback(hObject, eventdata, handles)


% --- Executes during object creation, after setting all properties.
function Filename_CreateFcn(hObject, eventdata, handles)
% 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 sampling_Callback(hObject, eventdata, handles)


% --- Executes during object creation, after setting all properties.
function sampling_CreateFcn(hObject, eventdata, handles)
% 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 fiberLength_Callback(hObject, eventdata, handles)
get(handles.fiberLength, 'String');

% --- Executes during object creation, after setting all properties.
function fiberLength_CreateFcn(hObject, eventdata, handles)
% 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 fiberLength_eidtText_Callback(hObject, eventdata, handles)


% --- Executes during object creation, after setting all properties.
function fiberLength_eidtText_CreateFcn(hObject, eventdata, handles)
% 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 Diameter_Callback(hObject, eventdata, handles)



% --- Executes during object creation, after setting all properties.
function Diameter_CreateFcn(hObject, eventdata, handles)
% 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 during object creation, after setting all properties.
function figure1_CreateFcn(hObject, eventdata, handles)
% hObject    handle to figure1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    empty - handles not created until after all CreateFcns called
% global loadcell



% --- Executes during object deletion, before destroying properties.
function figure1_DeleteFcn(hObject, eventdata, handles)
% hObject    handle to figure1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)


delete(instrfindall);




function speed_Callback(hObject, eventdata, handles)
% hObject    handle to speed (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 speed as text
%        str2double(get(hObject,'String')) returns contents of speed as a double


% --- Executes during object creation, after setting all properties.
function speed_CreateFcn(hObject, eventdata, handles)
% hObject    handle to speed (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 distance_Callback(hObject, eventdata, handles)
% hObject    handle to distance (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 distance as text
%        str2double(get(hObject,'String')) returns contents of distance as a double


% --- Executes during object creation, after setting all properties.
function distance_CreateFcn(hObject, eventdata, handles)
% hObject    handle to distance (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 selection change in direction.
function direction_Callback(hObject, eventdata, handles)
% hObject    handle to direction (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Hints: contents = cellstr(get(hObject,'String')) returns direction contents as cell array
%        contents{get(hObject,'Value')} returns selected item from direction


% --- Executes during object creation, after setting all properties.
function direction_CreateFcn(hObject, eventdata, handles)
% hObject    handle to direction (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    empty - handles not created until after all CreateFcns called

% Hint: popupmenu 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

my error is like this

error: file: dmmGUI210530.m line: 176 row: 4

Answer 1

[Walter Roberson]

You currently have

delta_L=0;
for
    vec(i) = str2double(query(myDmm, 'READ?')); %vec(i)번째에 읽어들인 값 저장

However, you need to complete that for statement. It appears that it should be

 for i = 1 : SOMETHING

but I cannot tell what the SOMETHING limit should be.

Note:

time = num2str((100/str2double(get(handles.velocity,'String'))).\str2double(get(handles.distance, 'string'))*1000*(10/4));

The .\ operator is very obscure, and you should probably never use it. For scalar A and B, A.\B is the same as B./A which is a lot clearer to write. Do you want velocity divided by distance, or do you want distance divided by velocity ?