MATLAB: Replace string and then place it again

fprintfMATLABstring replace

Hey, I want to make the output return # as many times as a certain string has, and then, change each # with the corresponding letter in the original string to get a cool ouput.
This is my code so far but I got stuck:
function a = jamstr(strd,time)
for i = 0:1:length(strd)
    z = i + 1;
    expression = '^.*'; 
    replace = '#';
    newStr = regexprep(strd(z),expression,replace)
    fprintf(newStr);
    pause(time);
    a=z;
    if z == length(strd)
        break
    end
end
end

Best Answer

This is intentionally backwards from what you asked; adjusting it to start with all '#' is for you
helpful: https://www.mathworks.com/matlabcentral/answers/348090-how-do-i-overwrite-text-in-the-command-window
https://www.mathworks.com/matlabcentral/answers/372643-is-it-possible-to-rewrite-update-a-printed-line
function a = jamstr( strd, time )
    fprintf( '%s', strd );  % print the entire string
    % one backspace for each char
    bkspaces = repmat('\b',size(strd));
    fmt = [bkspaces '%s'];  % format string for fprintf
    
    for i = 1:length(strd)
        newStr = strd;
        newStr(i) = '#';
        
        fprintf( fmt, newStr );
        
        pause(time);
    end
    
    fprintf( fmt, strd );  % restore original
    fprintf( '\n' );  % end on a fresh line
end
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