home *** CD-ROM | disk | FTP | other *** search
- Path: sparky!uunet!spool.mu.edu!darwin.sura.net!jvnc.net!netnews.upenn.edu!netnews.cc.lehigh.edu!ns1.cc.lehigh.edu!dlj0
- From: dlj0@ns1.cc.lehigh.edu (DAVID L. JOHNSON)
- Newsgroups: sci.math.symbolic
- Subject: Re: mma big bad bug
- Message-ID: <1993Jan6.015504.58708@ns1.cc.lehigh.edu>
- Date: 6 Jan 93 01:55:04 GMT
- Organization: Lehigh University
- Lines: 28
-
- In article <mgh3-050193112839@math26647.math.cwru.edu>, mgh3@po.cwru.edu (mike hurley) writes:
- >> >Here is a bizzarre mma bug. Try entering:
- >> >
- >> >Pi*Sqrt[Pi]/(2*3*Sqrt[2])
- >> >
- >> >This is very bad. If anyone knows what is going on,
- >> >I would like to hear from them.
- >> >
- >> >Brett
- >> Quite bizarre -- Mathematica just seems to stop dead in its tracks!
- >>
- >From a look at this with tracing turned on, it seems that Mma is getting
- >caught in an infinite loop, changing Sqrt[(Pi^3)/8]/3 into (Pi/2)^(3/2)/3
- >and then back again. I'm speculating that the first change is an attempt
- >to simplify the total expression and the second is an attempt to make the
- >output "prettier". Bad news. (mma 2.0 on a sparc; similar results with
- >the windows version).
- >
- The problem with this explanation is that, when you drop the 2*3, it doesn't
- have any trouble...
- --
- Sincerely,
-
- David L. Johnson ID: dlj0@lehigh.edu
- Christmas-Saucon Hall #14, rm 241 dlj0@chern.math.lehigh.edu
- Department of Mathematics
-
- Lehigh University Telephone: 215-758-3759 (office)
-