Error 'Array indices must be positive integers or logical values.' matlab gui

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Lai Ken Siang
Lai Ken Siang on 13 Apr 2022
Commented: Steven Lord on 14 Apr 2022
I'm trying to convert morse code to texts and numbers. But it can only show one output for example, When I type '...' it shows 'S' however when I type '...---...'(morse code for SOS) there is an error 'Array indices must be positive integers or logical values.' and error in line:
set(handles.text11, 'string', alphanum(index));
This is my code:
input = char(get(handles.edit2,'string'));
morse = {'.----','..---','...--','....-','.....','-....','--...','---..',...
'----.','-----','.-','-...','-.-.','-..','.','..-.','--.','....',...
'..','.---','-.-','.-..','--','-.','---','.--.','--.-','.-.','...',...
'-','..-','...-','.--','-..-','-.--','--..','/','.-.-.-'};
alphanum = {'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',' ','STOP'};
symbol = strsplit(input, ' ');
[~, index] = ismember(symbol, morse);
set(handles.text11, 'string', alphanum(index));

Accepted Answer

Geoff Hayes
Geoff Hayes on 13 Apr 2022
@Lai Ken Siang - I think that you will need to revisit your code. When the string is '...---...', how does the code know where one letter stops and the other ends. I think that you will need to add spaces between each character, then split the string on the space character. This will create an array of morse code signals. You will then need to iterate over each signal and convert that signal to the character (using the code above).
  4 Comments
Steven Lord
Steven Lord on 14 Apr 2022
morse = {'.----','..---','...--','....-','.....','-....','--...','---..',...
'----.','-----','.-','-...','-.-.','-..','.','..-.','--.','....',...
'..','.---','-.-','.-..','--','-.','---','.--.','--.-','.-.','...',...
'-','..-','...-','.--','-..-','-.--','--..','/','.-.-.-'};
alphanum = {'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',' ','STOP'};
You can join together the Morse code segments for each letter. You need to transpose 'SOS' or split it into a cell array so ismember treats each character as its own entity rather than looking for the whole string 'SOS' in alphanum.
[~, loc] = ismember(transpose('SOS'), alphanum)
loc = 3×1
29 25 29
[~, loc] = ismember({'S','O','S'}, alphanum)
loc = 1×3
29 25 29
M = join(morse(loc), ' ')
M = 1×1 cell array
{'... --- ...'}

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