Newsgroups: comp.lang.apl
Path: watmath!watserv2.uwaterloo.ca!torn!cs.utexas.edu!zaphod.mps.ohio-state.edu!swrinde!elroy.jpl.nasa.gov!jato!csi!sam
From: sam@csi.jpl.nasa.gov (Sam Sirlin)
Subject: Re: Tacit numerical integration?
Message-ID: <1992Oct30.181306.2131@csi.jpl.nasa.gov>
Originator: sam@kalessin
Sender: usenet@csi.jpl.nasa.gov (Network Noise Transfer Service)
Nntp-Posting-Host: kalessin
Organization: Jet Propulsion Laboratory, Pasadena, CA
References: <16223@umd5.umd.edu> <1992Oct24.192342.2201@yrloc.ipsa.reuter.COM> <16385@umd5.umd.edu> <1298@kepler1.rentec.com>
Date: Fri, 30 Oct 1992 18:13:06 GMT
Lines: 23


In article <1298@kepler1.rentec.com>, andrew@rentec.com (Andrew Mullhaupt) writes:
|> In article <16385@umd5.umd.edu> jph@astro.umd.edu (J. Patrick Harrington) writes:
|> 
|>    rk 
|> ...
|> How about RKF-78? I can't wait.

Actually I have used APL versions of RK45 and RKV56 alot. Rather than
going to higher orders I had been fooling around with implicit RK
routines. All of these are pretty simple looking in APL. Someday I
suppose I will try translating them to J. I agree that tacit
representations are not desirable for expressing algorithms in. They
seem to be a sort of intermediate stage in compilation that's easier
for machine translation than "raw" APL.  But will the built in
compilers (:11 and :12) ever work well on the multi-line functions
that we all need for "real" work?


-- 
Sam Sirlin
Jet Propulsion Laboratory         sam@kalessin.jpl.nasa.gov

