Getting Multiple responses/input using GetEchoString

Hi,

Does anyone knows how can I get multiple responses with GetEchoString, and making the previous responses stay on the screen at the same time. I tired these codes (refer below), it works out fine for getting the responses, but the previous response just vanish whenever I start typing the second response. Please help. Thanks in advance.

for Length=1:initial_length
check_answer = str2mat(wordpool(wordset2))
Response = GetEchoString_VSmod(wPtr, text, 500, 100, textBlack, white,Length);
 % I modified the positioning of my output here, that is why the function is now 
  called differently

   Screen('DrawText', wPtr, text, 500, 100, textBlack);
   Screen('DrawLine',wPtr,[0 0 0], 640, (Length*150)+140, 1040 ,(Length*150)+140, 5);
   Screen('DrawText', wPtr, Response, 650, (Length*150)+40, textBlack)
   vbl=Screen('Flip', wPtr, vbl+(flipSpd*monitorFlipInterval),1);
  end

This is my modified GetEchoString

FlushEvents('keyDown');

% Write the message
    Screen('DrawText', windowPtr, msg, x, y, textColor, bgColor);
    Screen('DrawLine',windowPtr,[0 0 0], 640, (Length*150)+140, 1040 ,(Length*150)+140, 5);
  Screen('Flip', windowPtr, 0, 1);

string = '';
while true
  char = GetChar;
  switch (abs(char))
      case {13, 3, 10}
          % ctrl-C, enter, or return
          break;
          case 8
            % backspace
              if ~isempty(string)
                  string = string(1:length(string)-1);
              end
          otherwise
              string = [string, char];
      end

    output = [msg, ' ', string]; 
    Screen('DrawText', windowPtr, msg, x, y, textColor, bgColor);
    Screen('DrawLine',windowPtr,[0 0 0], 640, (Length*150)+140, 1040 ,(Length*150)+140, 5);
    Screen('Flip', windowPtr, 0, 1);
    Screen('DrawText', windowPtr, string, 650, (Length*150)+40, textColor, bgColor);
    Screen('Flip', windowPtr);
end

Answer 1

[Daniel Shub]

Screen('DrawText', wPtr, Response, 650, (Length*150)+40, textBlack)

I think you want to concatenate your new Response with your old Response.