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From: rockwell@socrates.umd.edu (Raul Rockwell)
Newsgroups: comp.lang.apl
Subject: Re: Turing Machine emulator (in J)
Message-ID: <ROCKWELL.91Jun15151436@socrates.umd.edu>
Date: 15 Jun 91 20:14:36 GMT
References: <ROCKWELL.91Jun11214249@socrates.umd.edu>
Sender: rockwell@socrates.umd.edu (Raul Rockwell)
Organization: Traveller
Lines: 30
In-Reply-To: rockwell@socrates.umd.edu's message of Wed, 12 Jun 1991 02: 42:49 GM

I wrote:
   One of the tricks you can pull with J is reading from standard
   input in a script, so my bootstrap loader looks like this:

   read =. 1!:1

   readblock =. (read 1 1 1 1) : ''
   r=. 0 0 $ ''
   loop) r=. r, l=. read 1
   $.=. end [~:(0=#l) loop
   end) r

AARRRRGGGGHHHHH!!!!!!!!

the second line from the bottom should read:
$.=. end [^:(0=#l) loop

[Mr. Hui, please, please, please, could you port J to HP/PA?  I
wouldn't have this sort of problem if I had a working version of J on
this system.  [Incidentally, anyone in Toronto have telnet access that
they could let Mr. Hui use to do the port???]]

Finally, I've re-written the TM emulator in a more concise and [I
think] clearer fashion, maybe once I'm sure I've got a copy of it that
is totally debugged I'll re-post.

*sigh*

-- 
Raul <rockwell@socrates.umd.edu>