how to implement matlab count

I am very much a beginner at matlab and have written my first script. I am lost though on how to create a way to collect and plot my data. Using count was suggested, but even with that I am lost. Any help would be great. My script is below:

% Displays the number of seconds that have elapsed when the user presses
% only the 'k' and 'd' key.
KbName('UnifyKeyNames')
fprintf('Press the d key the left finger and the k key for the right. Each trial will last 60 seconds \n');
fprintf('Type the escape key to end the program.\n');
escapeKey = KbName('ESCAPE');
startSecs = GetSecs;

% Set up the timer.
durationInSeconds = 60 * 1;
numberOfSecondsRemaining = durationInSeconds;

RestrictKeysForKbCheck([75, 68, escapeKey])

ListenChar(2)

% Loop while there is time.
while numberOfSecondsRemaining > 0
    numberOfSecondsElapsed = GetSecs - startSecs;
    numberOfSecondsRemaining = durationInSeconds - numberOfSecondsElapsed;

  [ keyIsDown, timeSecs, keyCode ] = KbCheck;
  if keyIsDown; 
    fprintf('"%s" typed at time %.3f seconds\n',...
    KbName(keyCode), timeSecs - startSecs);

    if keyCode(escapeKey)
      break;
    end

        % If the user holds down a key, KbCheck will report multiple events.
        % To condense multiple 'keyDown' events into a single event, we wait until all keys have been released.
        while KbCheck; end
    end    
end

Answer 1

[Walter Roberson]

RestrictKeysForKbCheck and associated routines are not part of MATLAB; they are routines from psychtoolbox, which has its own forums.

In MATLAB, to check key presses and key releases, you create a figure, and then you use WindowKeyPressFcn callback and WindowKeyReleaseFcn callback.