error on line 42 : gui_mainfcn(gui_State, varargin{:});

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Jake
Jake il 28 Mag 2023
Commentato: Ahmed il 24 Feb 2024
very new to coding. i have just run this code and i end up with this error. would like a bit of insight to know how i could fix it. thank you
the code:
function varargout = final_project(varargin)
% FINAL_PROJECT MATLAB code for final_project.fig
% FINAL_PROJECT, by itself, creates a new FINAL_PROJECT or raises the existing
% singleton*.
%
% H = FINAL_PROJECT returns the handle to a new FINAL_PROJECT or the handle to
% the existing singleton*.
%
% FINAL_PROJECT('CALLBACK',hObject,eventData,handles,...) calls the local
% function named CALLBACK in FINAL_PROJECT.M with the given input arguments.
%
% FINAL_PROJECT('Property','Value',...) creates a new FINAL_PROJECT or raises the
% existing singleton*. Starting from the left, property value pairs are
% applied to the GUI before final_project_OpeningFcn gets called. An
% unrecognized property name or invalid value makes property application
% stop. All inputs are passed to final_project_OpeningFcn via varargin.
%
% *See GUI Options on GUIDE's Tools menu. Choose "GUI allows only one
% instance to runbut (singleton)".
%
% See also: GUIDE, GUIDATA, GUIHANDLES
% Edit the above text to modify the response to help final_project
% Last Modified by GUIDE v2.5 29-May-2023 00:53:41
% Begin initialization code - DO NOT EDIT
gui_Singleton = 1;
gui_State = struct('gui_Name', mfilename, ...
'gui_Singleton', gui_Singleton, ...
'gui_OpeningFcn', @final_project_OpeningFcn, ...
'gui_OutputFcn', @final_project_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 final_project is made visible.
function final_project_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 final_project (see VARARGIN)
% Choose default command line output for final_project
handles.output = hObject;
% Update handles structure
guidata(hObject, handles);
% UIWAIT makes final_project wait for user response (see UIRESUME)
% uiwait(handles.figure1);
delete(instrfind({'Port'},{'COM3'}))
clear a;
global a;
a = arduino();
% --- Outputs from this function are returned to the command line.
function varargout = final_project_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;
% --- Executes on button press in G_LED_ONbut.
function G_LED_ONbut_Callback(~, ~, ~)
% hObject handle to G_LED_ONbut (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
global a;
a.writeDigitalPin(a,D2,1)
% --- Executes on button press in G_LED_OFFbut.
function G_LED_OFFbut_Callback(~, ~, ~)
% hObject handle to G_LED_OFFbut (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
global a;
a.writeDigitalPin(a,D2,0)
% --- Executes on key press with focus on G_LED_ONbut and none of its controls.
function G_LED_ONbut_KeyPressFcn(~, ~, ~)
% hObject handle to G_LED_ONbut (see GCBO)
% eventdata structure with the following fields (see MATLAB.UI.CONTROL.UICONTROL)
% 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)
% --- Executes on button press in Runbut.
function Runbut_Callback(~, ~, handles)
% hObject handle to Runbut (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
s = eval(get(handles.Samplestxt, 'string'));
axes(handles.Axes1);
title(Axes1,'Changes of IR Data')
xlabel('Changes of IR')
ylabel('Sample')
hold on
grid on
for x = 0: 0.01: s
global a;
y = readVoltage(a,'A0');
plot(x,y)
end
global a;
readIR = readVoltage(a,'A1');
set(handles.LItxt, 'string', readIR)
writePWMVoltage(a,'d3', readIR);
Lcount = 0;
Mcount = 0;
Hcount = 0;
if readIR < 1.25
Lcount = Lcount + 1;
elseif readIR > 1.25 && readIR < 3.75
Mcount = Mcount + 1;
elseif readIR > 3.75
Hcount = Hcount + 1;
end
q = [Lcount, Mcount, Hcount];
bar(q)
dist = {"low", "med", "high"};
set(gca, 'XTickLabel', dist)
% --- Executes on button press in Clearbut.
function Clearbut_Callback(~, ~, handles)
% hObject handle to Clearbut (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
set(handles.LItxt, 'string', '')
set(handles.Samplestxt, 'string', '')
cla
function Samplestxt_Callback(~, ~, ~)
% hObject handle to Samplestxt (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 Samplestxt as text
% str2double(get(hObject,'String')) returns contents of Samplestxt as a double
% --- Executes during object creation, after setting all properties.
function Samplestxt_CreateFcn(hObject, ~, ~)
% hObject handle to Samplestxt (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 LItxt_Callback(~, ~, ~)
% hObject handle to LItxt (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 LItxt as text
% str2double(get(hObject,'String')) returns contents of LItxt as a double
% --- Executes during object creation, after setting all properties.
function LItxt_CreateFcn(hObject, ~, ~)
% hObject handle to LItxt (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
  3 Commenti
Jake
Jake il 28 Mag 2023
i do have the arduino package installed.
this is the full error message
Error using final_project>final_project_OpeningFcn
MATLAB connection to Uno at COM3 exists in your workspace. To create a new connection, clear the existing object.
Error in gui_mainfcn (line 220)
feval(gui_State.gui_OpeningFcn, gui_hFigure, [], guidata(gui_hFigure), varargin{:});
Error in final_project (line 42)
gui_mainfcn(gui_State, varargin{:});
Ahmed
Ahmed il 24 Feb 2024
Error in pushbutton1 (line 42)
gui_mainfcn(gui_State, varargin{:});
same error here

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Risposte (1)

Walter Roberson
Walter Roberson il 28 Mag 2023
Change
delete(instrfind({'Port'},{'COM3'}))
clear a;
global a;
a = arduino();
to
global a;
if ~isempty(a); clear global a; global a; end
a = arduino();
  3 Commenti
Walter Roberson
Walter Roberson il 28 Mag 2023
As outside observers, we have little idea what the properties of handles.Samplestxt are . We know it has a String property, but we do not know whether it is a uicontrol style button or uicontrol style listbox or uicontrol style text or uicontrol style edit -- and if it uicontrol style edit, we have no reason to expect that its Max property is 1 (because if Max > 1 then String could potentially be a cell array of character vectors, depending on what the user entered in.
But why are you eval()'ing user input anyhow? You seem to be expecting that the field contains a numeric scalar; if that is the case use str2double() and make sure to test isfinite(s)
Jake
Jake il 28 Mag 2023
the handles.Samplestxt is an edit text function. thank you for some insight on the issue though

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