If I have a while loop that outputs a different letter (or space) each time I run it, how can I combine all the outputted letters from each loop into a string.

So if loop one gave me 't' loop two outputs 'a' and loop three output 'p', I want the final string to be 'tap'

I have attached my code below. letter is the output that gives me the letter at the index I want, so I want to make a string of all the letters

fh = fopen(txt,'r');
line = fgetl(fh);
while ischar(line)
    [row,rest] = strtok(line,'-')
    rest = rest(2:end)
    row = str2num(row)
    [col,rest] = strtok(rest,'-')
    rest = rest(2:end)
    col = str2num(col)
    [spot,~] = strtok(rest,'-')
    spot = str2num(spot)
    pos = dec(row,col)
    pos = char(pos)
    letter = pos(spot)
    line = fgetl(fh);
end

Answer 1

[Geoff Hayes]

Lauren - outside of your while loop you can create an empty string variable such as

 message = '';

Then, whenever you get a new letter you can add it to the message

 letter = pos(spot);
 message = [message letter];

So on each iteration of the loop, you will build the message to be (for example) tap.