How Do I Perform Decoding Morse Code Using GUI?

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

% Last Modified by GUIDE v2.5 18-Apr-2021 14:40:40

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

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

% Update handles structure
guidata(hObject, handles);

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


% --- Outputs from this function are returned to the command line.
function varargout = morsecodetranslator_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 wordinput_Callback(hObject, eventdata, handles)
% hObject    handle to wordinput (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 wordinput as text
%        str2double(get(hObject,'String')) returns contents of wordinput as a double
letters_input=get(hObject,'string');
handles.letters_input=letters_input;
guidata(hObject,handles);

% --- Executes during object creation, after setting all properties.
function wordinput_CreateFcn(hObject, eventdata, handles)
% hObject    handle to wordinput (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 translatetomorse.
function translatetomorse_Callback(hObject, eventdata, handles)
% hObject    handle to translatetomorse (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
input=char(get(handles.wordinput,'string')); %get string from edit text
input=upper(input); %change to capital
word_to_morse= '';
morse={'.----','..---','...--','....-','.....','-....','--...','---..','----.','-----','.-','-...','-.-.','-..','.','..-.','--.','....','..','.---','-.-','.-..','--','-.','---','.--.','--.-','.-.','...','-','..-','...-','.--','-..-','-.--','--..','/'}; 
number_and_letter={'1','2','3','4','5','6','7','8','9','0','A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z',' '};

%Translation Formula/Steps
for i=1:length(input)
    character = input(i);
    [~, index] = ismember(character, number_and_letter);
    if ~isempty(index)
        if isempty(word_to_morse)
            word_to_morse = morse{index};
        else
            word_to_morse = [word_to_morse ' ' morse{index}];
        end
    end
end

set(handles.morseoutput,'string',word_to_morse);


% --- Executes on button press in translatetoword.
function translatetoword_Callback(hObject, eventdata, handles)
% hObject    handle to translatetoword (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
input=char(get(handles.wordinput,'string'));
input=upper(input);

morse={'.----','..---','...--','....-','.....','-....','--...','---..','----.','-----','.-','-...','-.-.','-..','.','..-.','--.','....','..','.---','-.-','.-..','--','-.','---','.--.','--.-','.-.','...','-','..-','...-','.--','-..-','-.--','--..','/'}; 
number_and_letter = ['1':'9', '0', 'A':'Z'];  

[Min Hao Soo]

Hi, I'm trying to perform decoding part for GUI. For example my input is SOS and my output should be in the form of

'...---...'.I've managed to translate morse code into text but for only one alphabet or one number and it wont show the translated word if I input more than 1 number or alphabet.

Answer 1

[Walter Roberson]

Hint:

strsplit() the morse, and ismember into the list of codes to figure out which is being matched.

morse={'.----','..---','...--','....-','.....','-....','--...','---..','----.','-----','.-','-...','-.-.','-..','.','..-.','--.','....','..','.---','-.-','.-..','--','-.','---','.--.','--.-','.-.','...','-','..-','...-','.--','-..-','-.--','--..','/'}; 
number_and_letter = ['1':'9', '0', 'A':'Z'];  
number_and_letter(ismember(morse, '.-..'))

ans = 'L'

[Min Hao Soo]

I think I miss a part of a code, because I got blank when i typed in more than 2 characters

% --- Executes on button press in translatetoword.
function translatetoword_Callback(hObject, eventdata, handles)
% hObject    handle to translatetoword (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
input=char(get(handles.wordinput,'string'));
input=upper(input);
input=strsplit(input);

morse={'.----','..---','...--','....-','.....','-....','--...','---..','----.','-----','.-','-...','-.-.','-..','.','..-.','--.','....','..','.---','-.-','.-..','--','-.','---','.--.','--.-','.-.','...','-','..-','...-','.--','-..-','-.--','--..','/'}; 
number_and_letter = ['1':'9', '0', 'A':'Z'];  

output=number_and_letter(ismember(morse,input));

set(handles.morseoutput,'string',output);

[Min Hao Soo]

Did I miss anything? because it still cant display more than 1 alphabet or number

[Walter Roberson]

Yes, you have missed something. The code I gave was for the case that the input is a single vector of morse code, and it only works in that case. You have to adapt the code to handle multiple vectors, such as taking them one at a time, or using ismember() differently.

[Min Hao Soo]

Ok So I think I figured out how the code should look like but I'm getting the error: Array indices must be positive integers or logical values, on the line: morse_to_word=(number_and_letter(index)); ?

% --- Executes on button press in translatetoword.
function translatetoword_Callback(hObject, eventdata, handles)
% hObject    handle to translatetoword (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
input=char(get(handles.wordinput,'string'));
input=upper(input);


morse={'.----','..---','...--','....-','.....','-....','--...','---..','----.','-----',...
       '.-','-...','-.-.','-..','.','..-.','--.','....','..','.---','-.-','.-..','--','-.','---','.--.','--.-','.-.','...','-','..-','...-','.--','-..-','-.--','--..',...
       '/'}; 
number_and_letter = ['1':'9', '0', 'A':'Z',' '];  

text=strsplit(input,'');
[~, index] = ismember(text, morse);

morse_to_word=(number_and_letter(index));

set(handles.morseoutput,'string',morse_to_word);

[Min Hao Soo]

It only occurs when I put a slash for example: .../---/...

However when I input ... --- ... with spaces, the output will show S O S in three seperated lines?

[Walter Roberson]

You have

text=strsplit(input,'');

but you need

text=strsplit(input,' ');
%                    ^

You also need to add

text(cellfun(@isempty, text)) = [];   %extra spaces must be deleted

[Min Hao Soo]

input=char(get(handles.morsetextbox,'string'));

morse={'.----','..---','...--','....-','.....','-....','--...','---..','----.','-----',...
       '.-','-...','-.-.','-..','.','..-.','--.','....','..','.---','-.-','.-..','--','-.','---','.--.','--.-','.-.','...','-','..-','...-','.--','-..-','-.--','--..','/'}; 
number_and_letter={'1','2','3','4','5','6','7','8','9','0','A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z',' '}; 

text=strsplit(input,' ');
text(cellfun(@isempty, text)) = [];
[~, index] = ismember(text, morse);
morse_to_word=(number_and_letter(index));
set(handles.wordtextbox,'string',morse_to_word);

[Min Hao Soo]

I'm sorry is this the correct arrangement for adding the line text(cellfun(@isempty, text)) = []; ?

[Min Hao Soo]

Because I added the line:

translated=(number_and_letter(index));
morse_to_word=strjoin(translated);

And it seem to give me in a straight line with but with extra spaces?

[Min Hao Soo]

Oh I found the solution, I just need to add(~isspace()) into the last line. Thank you so much for your time and help!

[Walter Roberson]

morse_to_word=strjoin(translated, '');