How to make each component a string in one whole string?

I have an excel file that transfers over letters in a string like {'C D E F'}. I was wondering how to make each letter a string by itself, like 'C' 'D' 'E' 'F'.

Here's my code not sure if it will help or not.

%Paino Figure w/ pushbuttons
function PianoImage_HBraslawsce()

    f=figure();
    set(f, 'MenuBar','none'); %Remove menu bar
    set(f,'NumberTitle','off');
    set(f,'Name', 'Note Learner'); %Change name
    %Each key as a pushbutton
    %<SM:PLOT>
    KEYC = uicontrol('style','pushbutton','backgroundcolor',[1 1 1],'units','normalized',...
        'position',[.15 .15 .1 .45], 'UserData', 'C','Callback',@keypressed);
    KEYD = uicontrol('style','pushbutton','backgroundcolor',[1 1 1],'units','normalized',...
        'position',[.25 .15 .1 .45], 'UserData', 'D','Callback',@keypressed);
    KEYE = uicontrol('style','pushbutton','backgroundcolor',[1 1 1],'units','normalized',...
        'position',[.35 .15 .1 .45], 'UserData', 'E','Callback',@keypressed);
    KEYF = uicontrol('style','pushbutton','backgroundcolor',[1 1 1],'units','normalized',...
        'position',[.45 .15 .1 .45], 'UserData', 'F','Callback',@keypressed);
    KEYG = uicontrol('style','pushbutton','backgroundcolor',[1 1 1],'units','normalized',...
        'position',[.55 .15 .1 .45], 'UserData', 'G','Callback',@keypressed);
    KEYA = uicontrol('style','pushbutton','backgroundcolor',[1 1 1],'units','normalized',...
        'position',[.65 .15 .1 .45], 'UserData', 'A','Callback',@keypressed);
    KEYB = uicontrol('style','pushbutton','backgroundcolor',[1 1 1],'units','normalized',...
        'position',[.75 .15 .1 .45], 'UserData', 'B','Callback',@keypressed);
    KEYCHI = uicontrol('style','pushbutton','backgroundcolor',[1 1 1],'units','normalized',...
        'position',[.85 .15 .1 .45], 'UserData', 'C(high)','Callback',@keypressed);
    KEYCSH = uicontrol('style','pushbutton','backgroundcolor',[0 0 0],'units','normalized',...
        'position',[.20 .3 .08 .3], 'UserData', 'C#','Callback',@keypressed);
    KEYEb=uicontrol('style','pushbutton','backgroundcolor',[0 0 0],'units','normalized',...
        'position',[.30 .3 .08 .3], 'UserData', 'Eb','Callback',@keypressed);
    KEYFSH=uicontrol('style','pushbutton','backgroundcolor',[0 0 0],'units','normalized',...
        'position',[.5 .3 .08 .3], 'UserData', 'F#','Callback',@keypressed);
    KEYAb=uicontrol('style','pushbutton','backgroundcolor',[0 0 0],'units','normalized',...
        'position',[.60 .3 .08 .3], 'UserData', 'Ab','Callback',@keypressed);
    KEYBb=uicontrol('style','pushbutton','backgroundcolor',[0 0 0],'units','normalized',...
        'position',[.70 .3 .08 .3], 'UserData', 'Bb','Callback',@keypressed);

 %MATLAB read data
[~,~,Array]=xlsread('Note_File'); %<SM:READ>

%slices out notes only
Notes=Array(1:3,2:6); %<SM:SLICE>

Beginner=Notes(1:1,1:5); %slices out each level
Intermediate=Notes(2:2,1:5);
Advanced=Notes(3:3,1:5);

Beginner2=numel(Beginner); %randomizes beginner level
set1=randperm(Beginner2); %<SM:RANDUSE>
BeginnerRAN=Beginner(set1(1:1));


Intermediate2=numel(Intermediate); %randomizes intermediate level
set2=randperm(Intermediate2);
IntermediateRAN=Intermediate(set2(1:1));


Advanced2=numel(Advanced); %randomizes advanced level
set3=randperm(Advanced2);
AdvancedRAN=Advanced(set3(1:1));
 


randomKeysToPress = BeginnerRAN %this is where it stops working
     
    for key = randomKeysToPress %<SM:FOR>
        fprintf(' %s', char(key));
    end
    fprintf('\n');
    atKey=1;
    
        function keypressed(hObject, eventdata)
        if strcmp(randomKeysToPress{atKey}, get(hObject, 'UserData'))==1
            msgbox('Good Job!');
            atKey = atKey + 1;
            if atKey > length(randomKeysToPress)
                fprintf('Game over!!!\n');
            end
        else
            msgbox('ERROR. Please try again. \n');
        end
            
    end
   

end

[Rik]

What is your exact input? The cell containing a char array with space delimited letters?

And what is your exact output? Do you want a char array with just the letters? Should each letter be a char wrapped in a cell?

Answer 1

[jessupj]

depends on how you want your output, but i'd use the split function and then cast the returned cell into a string array

Snew = string( split(S,' ') )
Snew{3}

ans =

    'E'

https://www.mathworks.com/help/matlab/ref/split.html

[Han]

Okay, this makes sense but I need all the letters at once if that's possible? If not I guess I could use this for each letter. Thank you!

[Rik]

They are already stored in a cell array. From your code it is not clear to me how you can best use it, but you don't need to hard-code indices.

[Han]

@ jessupj, actually I got it to work! Thank you soooo much!

Answer 2

[David Hill]

I am not sure what you are doing, but:

x={'C D E F'};
y=cell2mat(x);
y=y(y~=' ')';%it is now a column matrix, but you could convert back to a cell array