If you install this 'first' MATLAB code (tape), then beware of the bugs. One bug is that you cannot use an if statement inside of a while loop (or is it a while statement inside of an if loop ? :) ) The fix is that if you put the if statement into another/separate .m file, then you can execute that file inside the while loop. :) (It took awhile to figure out how to get around that bug :)) But even with only FORTY commands, the first version of MATLAB was worth using. :)