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. :)