HDTenEightyP/NetNews huggingface dataset:
From: mflll@uxa.ecn.bgu.edu (Dr. Laurence Leff)
Subject: Re: EE Applications
Keywords: EE,simultaneous differential equations
Organization: Educational Computing Network
Date: Thu, 7 Jan 1993 00:37:12 GMT

In article <C0ExBD.8pw@icon.rose.hp.com> clw@hprnd.rose.hp.com (Carl Wuebker) writes:
>     I'm interested in getting a math package to help me out in both the
>traditional and some "extended" EE circuit theory problems.  Most of these
>problems are solvable or simplifiable, but the process of solving/simplifying
>the equations usually takes (me) hours without a math package.

You may wish to look at the NETFORM system of Smit J. and van Hulzen J. A.

Some references are:

ACM SIGSAM Bulletin Vol. 15 No. 4 (1981)
Symbolic Numeric Methods in Microwave Technology, by Smit and J. Van Hulzen
Eurocam '82 European Computer Algebra Conference 
A Lecture Notes in Computer Science 144, Springer Verlag

Dr. Laurence Leff  Western Illinois University, Macomb IL 61455 ||(309) 298-1315
Stipes 447 Assistant Prof. of Computer Science ||Pager: 837-5909 FAX: 298-2302
Moderator:  Symbolic Math List, Technical Reports List||mflll@uxa.ecn.bgu.edu 
alt.binaries.pictures.fine-art hierarchy          ||BITNET: mflll@ecnuxa.bitnet
From: "marv kohn" <marv.kohn@execnet.com>
Newsgroups: sci.math.symbolic
Subject: mma + 0s2
Date: 11 Jan 93 04:43:27 EST
Reply-To: "marv kohn" <marv.kohn@execnet.com>
Distribution: sci
Organization: Executive Networks Information

TN> Is it possible & how do you start a mma-session in os2.

     Mathematica for Windows will not run on the currently shipping
version of OS/2 (version 2.0).  However, it WILL run on OS/2 v 2.1, which
is supposed to be released this quarter.  Anyone can get a copy of the OS/2
2.1 beta on cdrom, directly from IBM, for $15.
     I have been running MMA-Win 2.1 on the OS/2 2.1 beta for a few days
now.  Installation is easy.  First configure WinOS/2 to come up in
enhanced mode.  Make sure it is allocated plenty of dpmi memory.  Then run
the Mathematica install program from inside WinOS/2.
     I'm still trying to solve a few problems.  Most importantly, I can't
seem to change the default fonts.  But it is a major miracle that the
program runs at all in the OS/2 environment.  People said that this was
impossible.

- Marv Kohn -
---
  DeLuxe/386 1.25 #9360  For a good time, call 1-800-IBM-3OS2
--
Executive Network Information System  (914) 667-4567
International ILink Host
Newsgroups: sci.math.symbolic
From: siegman@EE.Stanford.EDU (Anthony E. Siegman)
Subject: Books on Mathematica (was Re: Novice asks for symbolic math suggestions...)
Organization: Stanford University
Date: Wed, 13 Jan 93 05:09:47 GMT

From two previous posts:

>   If you opt for Mathematica, the essential book is "Mathematica Quick  
>   Reference, Version 2" by Nancy Blachman which summarizes all of the  
>   commands and their options.

   ...unless you're over 50, in which case your eyesight probably
      won't be able to cope with the miniscule typefaces.  :)

>I got by ok with just the Mathematica textbook that comes with
>Mathematica, but you probably have to be an experienced programmer to
>understand it. 

   From my experience, if you're a novice to moderately experienced
Mathematica user you'll find Nancy Blachman's "Mathematica: A
Practical Approach" (Prentice-Hall, 1992) very helpful and useful.
Roman Maeder's "Programming in Mathematica", 2nd ed (Addison-Wesley,
1991) is more esoteric and less useful to the beginner, but you can
find some more advanced tricks and topics in it.  Get Blachman.
From: gruffini@landau.ucdavis.edu (Giulio Ruffini)
Newsgroups: sci.math.symbolic
Subject: Re: mma big bad bug
Date: 6 Jan 93 00:59:00 GMT
Organization: Physics, UC Davis

In article <15326.2b48512a@ohstpy.mps.ohio-state.edu> vandesande@ohstpy.mps.ohio-state.edu writes:
>Here is a bizzarre mma bug.  Try entering:
>
>Pi*Sqrt[Pi]/(2*3*Sqrt[2])
>
>Brett

I get (with Mma 2.0) the same "infinite" loop when Pi is replaced with other 
mathematical constants such as E, EulerGamma, Catalan. 
(I found this whilst trying to rule out my first thought which was that 
Power is getting confused  in looking for a way to apply E^(Pi I) = -1 )

Replacing Pi with, for example, 11 Pi seems to remove the problem, but
unprotecting and changing the attributes of Pi did not seem to help.
 
It is peculiar that the fact that Catalan has a special numerical value
affects Mma  even in cases where it is clear(?) that the 
numerical value is not used.

Andrew (from a friends account)        parkes@ucdhep.ucdavis.edu
Newsgroups: sci.math.symbolic
From: jrowney@arco.com
Subject: Re: mma big bad bug
Organization: ARCO Exp. and Prod. Tech.
Date: Tue, 5 Jan 1993 14:56:12 GMT

In article <15326.2b48512a@ohstpy.mps.ohio-state.edu>
vandesande@ohstpy.mps.ohio-state.edu 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!

Mac IIfx, MMA 2.102

John
jrowney@arco.com
From: gouvea@zariski.harvard.edu (Fernando Gouvea)
Newsgroups: sci.math.symbolic
Subject: Re: CAS 4 OS/2 ? (was Re: macsyma + OS/2 (WAS: Re: mma + 0s2))
Keywords: Which CAS's exist for OS/2 ?
Date: 12 Jan 93 15:50:29 GMT
Article-I.D.: husc3.1993Jan12.105030.19240
Distribution: sci
Organization: Colby College Dept. of Math/CS

In article <phfrom.422@nyx.uni-konstanz.de> phfrom@nyx.uni-konstanz.de (Hartmut Frommert) writes:
>Sorry if an Faq, but
>
>  which Computer Algebra systems do currently
>
>  1. Exist for OS/2 2.x (32 Bit)
>  2. Run under OS/2-DOS or Win-OS/2 ?

Very few, because the ones that were ported to Windows all seem to use
WINMEM32.DLL, which OS/2 2.0 can't support. But...

1. Cohen's gp/pari has been compiled for OS/2, and is available at
math.ucla.edu. 

2. It's conceivable that one could use Haible's CLISP to compile Schelter's
maxima under OS/2.

3. If you have C source, you can always try to use emx-gcc to compile under
OS/2. (emx is almost a "unix emulator", so minimal changes are usually
necessary unless there's lots of system-specific things going on.)

4. Best of all, people who have been testing OS/2 2.1 say that Mathematica
(at least) now runs under Win-OS/2. I assume this will mean that the others
do too. (2.1 should be out this quarter, I hear.)


-- 
============================================================================
Fernando Q. Gouvea				fqgouvea@colby.edu
Dept. of Math/CS				(207)-872-3278
Colby College					Mudd 407
From: hearn@randvax.rand.org (Tony Hearn)
Newsgroups: sci.math.symbolic
Subject: Re: CAS 4 OS/2 ? (was Re: macsyma + OS/2 (WAS: Re: mma + 0s2))
Keywords: Which CAS's exist for OS/2 ?
Date: 12 Jan 93 17:24:05 GMT
Distribution: sci
Organization: RAND Corp., Santa Monica, Ca.

I have been asked to forward this message by Herbert Melenk, who cannot
send mail directly to this newsgroup.

Tony Hearn

----------------------------

re: CAS 4 OS/2 ?

>   which Computer Algebra systems do currently
> 
>   1. Exist for OS/2 2.x (32 Bit)
>   2. Run under OS/2-DOS or Win-OS/2 ?

REDUCE 3.4.1 runs in flat 32 bit mode under OS/2 (OS/2 window or
PM window). The OS/2 binaries are available in a beta version as a
free extension of REDUCE for MS/DOS - Windows 3.1.

--
Herbert Melenk
Konrad-Zuse-Zentrum fuer Informationstechnik
Heilbronner Str 10, D 1000 Berlin 31, Germany
e-mail:  melenk@sc.zib-berlin.de
Newsgroups: sci.math.symbolic
From: clw@hprnd.rose.hp.com (Carl Wuebker)
Subject: Re: EE Applications
Date: Wed, 6 Jan 1993 17:34:42 GMT
Organization: HP Roseville Networks
X-Newsreader: TIN [version 1.1.8 PL6]

> Subject: Value of Is in your sci.math.symbolic problem

> You have "Use 10^-15 (it varies between 10^14 and 10^15)"
> The minus sign is incongruous (all need them, or none); which is it?
> The problem is amenable to a linearization around ve(t)=1.75, so that
> is what I shall start by examining.

     Sorry, the statement should read "...between 10^-14 and 10^-15".
Thanks for catching this.

                                                   Carl
Newsgroups: sci.math.symbolic
From: siegman@EE.Stanford.EDU (Anthony E. Siegman)
Subject: Mathematica and Virtual on a Mac
Organization: Stanford University
Date: Mon, 11 Jan 93 20:50:44 GMT


   I'm about to try Mathematic 2.03 in combination with Virtual from
Connectix on a Mac II (or an SE/30) as a way of handling some problems
with very large arrays which overflow the 8 MB of RAM on my Macs.
Anyone have any useful hints or warnings about this?  (I understand
that the execution speed is not likely to be greatly enhanced by doing
this.)


Newsgroups: sci.math.symbolic
From: phr@telebit.com (Paul Rubin)
Subject: Re: Novice asks for symbolic math suggestions...
Organization: Telebit Corporation; Sunnyvale, CA, USA
Date: Wed, 13 Jan 1993 02:58:48 GMT

In article <ie81H*p=_b@atlantis.psu.edu> mek@guinan.psu.edu (Mark E. Kotanchek) writes:

   In article <lestrade.726863807@Ra.MsState.Edu> lestrade@Ra.MsState.Edu  
   (John Patrick Lestrade) writes:
   > ok, assume i am computer literate and math literate and I am a late
   > comer to symbolic math packages.  is there a consensus of opinion as to
   > which package i should buy: mathematica, maple, axiom (i just saw a book
   > in the bookstore for Axiom -- is it a viable contender?) and if
   > mathematica is the best, which book should I buy.

   If you opt for Mathematica, buy ALL the books as the on-line help is  
   worthless--IMHO, based upon experiences with Mathematica 2.1 on my  
   NeXTstation--unless you are already aware of the existence of the command. 

   If you opt for Mathematica, the essential book is "Mathematica Quick  
   Reference, Version 2" by Nancy Blachman which summarizes all of the  
   commands and their options.

I got by ok with just the Mathematica textbook that comes with
Mathematica, but you probably have to be an experienced programmer to
understand it.  The Quick Reference book is quite handy though again
most of the info is in the main manual.

If you just want to get started playing with symbolic math programs
and don't need something super high powered,
try the Emacs calculator calc.el (ftp from prep.ai.mit.edu:
pub/gnu/calc-2.02.tar.Z, plus you need GNU Emacs).  It's free and
amazing.
Newsgroups: sci.math.symbolic
From: ramin@crchh775.BNR.CA (Ramin Moshiri-Tafreshi)
Subject: Kidney Transplant Info. Needed
Date: Wed, 6 Jan 1993 16:10:34 GMT
Reply-To: ramin@crchh775.BNR.CA (Ramin Moshiri-Tafreshi)
Organization: Bell-Northern Research Ltd.


I would appreciate any information on Kidney Transplant options in the
USA.  Does anyonebody have information on Kidney transplant centers (all,
or the ones in southern US) such as the number and success rate of their 
transplants.

Any statistics, addresses or Phone numbers are appreciated.


Reagrds;
Ramin
Newsgroups: sci.math.symbolic
Subject: Re: more on mma big bad bug 
From: a_rubin@dsg4.dse.beckman.com (Arthur Rubin)
Date: 7 Jan 93 23:57:54 GMT
Organization: Beckman Instruments, Inc.

In <15373.2b4c73d5@ohstpy.mps.ohio-state.edu> vandesande@ohstpy.mps.ohio-state.edu writes:


>Pi Sqrt[Pi]/(2 2 Sqrt[2])

>The explanation for the "big bad bug" from Wolfram is that 
>the Simplification rules for Power conflict.  The expression
>is "simplified" back and forth between two different forms.
>Will fix in another release, they say.  There is no really 
>satisfactory fix.

There is a satisfactory fix.  Wolfram just doesn't think so.
The fix would be to set which automatic simplification is in effect with a
global variable.

I preferred the Sqrt simplification in 1.2 to 2.0, anyway.
--
Arthur L. Rubin: a_rubin@dsg4.dse.beckman.com (work) Beckman Instruments/Brea
216-5888@mcimail.com 70707.453@compuserve.com arthur@pnet01.cts.com (personal)
My opinions are my own, and do not represent those of my employer.
My interaction with our news system is unstable; please mail anything important.
From: hagadorn@amsaa-cleo.brl.mil (Thomas Hagadorn)
Newsgroups: sci.math.symbolic
Subject: Re: mma big bad bug
Date: 5 Jan 93 21:40:11 GMT
Organization: Army Materiel Systems Analysis Activity

In article <1icn2vINNer6@crcnis1.unl.edu> me@ienext.unl.edu writes:
|In article <15326.2b48512a@ohstpy.mps.ohio-state.edu>  
|vandesande@ohstpy.mps.ohio-state.edu writes:
|> 
|> Here is a bizzarre mma bug.  Try entering:
|> 
|> Pi*Sqrt[Pi]/(2*3*Sqrt[2])
|> 
|
|Finally! Here it is, the payoff for not upgrading! :^)
|
|Pi*Sqrt[Pi]/(2*3*Sqrt[2])
|
|    3/2
|  Pi
|----------
|6 Sqrt[2]
|
|Mathematica 1.0 on a NeXTCube '030. (What price progress?)

Likewise with version 1.2 for sun4.  Sounds like this wasn't a problem
until version 2.0.
From: jaffer@zurich.ai.mit.edu (Aubrey Jaffer)
Newsgroups: sci.math.symbolic
Subject: Re: fast variable ordering
Date: 7 Jan 93 16:54:59 GMT
Organization: M.I.T. Artificial Intelligence Lab.

In article <JAFFER.92Nov28182855@camelot.ai.mit.edu> I wrote:
>Variable or term orderings are a very common operations in Computer
>Algebra systems.  It makes sense to optimize these comparisons in
>order to improve system speed.
>
>Since in most systems there can be introduced new terms or variables
>which are in between adjacent existing terms, a naive ordering cannot
>be accomplished in finite storage.  String comparison is not as fast
>as integer comparison, and even floating point is expensive on older
>machines.
>
>I have been trying to find a dynamic data structure which would allow
>me to assign integers of a finite range (say 2^29) to variables and
>terms.  I am willing to periodically reassign all of these integers,
>but not more often than once per hundred term creations.
>
>I have looked through several books on data structures and algorithms
>and have not found an appropriate structure.  Can anyone suggest a
>solution?

  Date: Sat, 28 Nov 92 17:58:12 PST
  From: fateman@peoplesparc.Berkeley.EDU (Richard Fateman)

  I wrote a paper on doing this by combining a hash table and a tree,
  in ISSAC-91.

I have not gotten a copy of this paper yet.  But WHITTEN@FWVA.SAIC.COM
has sent me a suggestion which I distill as follows:

What he suggests is to store the variables in a binary tree, store the
decision string in the tree of each element with that element, and use
this decision string for fast variable comparisons.  If the tree
remains reasonably balanced, 30 bits of decision string (alias
integer) should be enough for any computation this century.

All the decision strings in a subtree will have to be recomputed
whenever that subtree is rebalanced, but this is within my
specifications.

What I acutally did in jacal1a0 is to make a string (of characters) a
component of each variable.  The first character in the string is the
user settable priority and the rest are from the variable name.
String comparison is a reasonably fast and some basis for ordering has
to be maintained with the variable.

At some time in the future the variable comparison acceleration as
described above can be added onto the existing system by adding an
integer field to variables and creating a balanced binary tree of
variables.
From: vandesande@ohstpy.mps.ohio-state.edu
Newsgroups: sci.math.symbolic
Subject: mma big bad bug
Date: 4 Jan 93 15:00:58 EST
Organization: The Ohio State University, Department of Physics


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
From: kogeddes@daisy.uwaterloo.ca (Keith O. Geddes)
Newsgroups: sci.math.symbolic
Subject: Re: starting xmaple with a file included
Date: 12 Jan 93 14:13:06 GMT
Organization: University of Waterloo

In article <1993Jan12.025633.36609@ns1.cc.lehigh.edu> dlj0@ns1.cc.lehigh.edu (DAVID L. JOHNSON) writes:
>What I want to do is set up a command that will launch maple in the xmaple
>interface (on an rs/6000 - but should be the same for all X boxes) with a
>file containing some collection of commands included.
>
>You can do this with non-x maple by:
>
>maple < foo.bar
>
>to load in the file foo.bar.  But, it doesn't work with xmaple.  I want to be
>able to do this so my calculus students can avoid entering some of the data
>I want them to work with.  I also don't want to have them fight with including
>a file from my directories, with a long pathname.
>
>Any ideas?


You can create a file named ".mapleinit" in your home directory, and you
can place into this file any sequence of maple commands (including read
statements in your case).
When maple (or xmaple) is invoked, all of the commands in your .mapleinit
file will get executed at the very beginning of the session.

Since you want an initialization file which all of your students would
get when they invoke maple, you are interested in creating a "system
initialization file".
This would be placed under the maple library directory, at the location

	.../lib/src/init

See the help page  ?maple  for more details.

If you have further questions on this matter, send e-mail to

	support@maplesoft.on.ca

Keith Geddes
Newsgroups: sci.math.symbolic
Subject: Re: mma big bad bug
From: a_rubin@dsg4.dse.beckman.com (Arthur Rubin)
Date: 5 Jan 93 18:47:51 GMT
Organization: Beckman Instruments, Inc.

In <15326.2b48512a@ohstpy.mps.ohio-state.edu> vandesande@ohstpy.mps.ohio-state.edu 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.

If you activate On[], you can see the loop it's in:

(Pi/2)^(3/2)/3 <--> Pi^(3/2)/(2^(3/2) 3)
--
Arthur L. Rubin: a_rubin@dsg4.dse.beckman.com (work) Beckman Instruments/Brea
216-5888@mcimail.com 70707.453@compuserve.com arthur@pnet01.cts.com (personal)
My opinions are my own, and do not represent those of my employer.
My interaction with our news system is unstable; please mail anything important.
From: fateman@peoplesparc.Berkeley.EDU (Richard Fateman)
Newsgroups: sci.math.symbolic
Subject: Re: mma big bad bug
Date: 6 Jan 1993 18:53:26 GMT
Organization: University of California, Berkeley
Distribution: world
NNTP-Posting-Host: peoplesparc.berkeley.edu
Summary: STOP, ALREADY

At this point, I think posters should cease reporting that this occurs
on their machine and system.  While I probably get as many jollies
poking at different systems' foibles, it gets boring to see them, and
I'd hate to think that EVERY bug (and alleged bug!)  is going to be
bandied about this way.  Presumably someone at WRI reads this and will
fix it.  I would have preferred it if the first poster had reported
this to WRI, and then reported back to this netnews list the results
of his/her inquiry.



-- 
Richard J. Fateman
fateman@cs.berkeley.edu   510 642-1879
Newsgroups: sci.math.symbolic
From: hook@wilbur.nas.nasa.gov (Edward C. Hook)
Subject: Re: mma big bad bug
Organization: NAS, NASA Ames Research Center, Moffett Field, CA
Date: Tue, 5 Jan 93 16:19:08 GMT
Summary: Another data point

In article <15326.2b48512a@ohstpy.mps.ohio-state.edu> vandesande@ohstpy.mps.ohio-state.edu 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

For what it's worth, here's what happens on one of our big SGI machines:

Script started on Tue Jan  5 08:07:35 1993
wilbur.hook: 101> math
Mathematica 2.0 for SGI Iris
Copyright 1988-91 Wolfram Research, Inc.
 -- X11 windows graphics initialized -- 

In[1]:= Pi*Sqrt[Pi]/(2*3*Sqrt[2])

$IterationLimit::itlim: Iteration limit of 4096 exceeded.

                    3
                  Pi
             Sqrt[---]
                   8
Out[1]= Hold[---------]
                 3

In[2]:= Quit
wilbur.hook: 102> exit
wilbur.hook: 103> 
script done on Tue Jan  5 08:10:16 1993

Ed Hook
hook@nas.nasa.gov
Xref: sparky sci.math:17703 alt.books.technical:418
From: hougen@focus.csl.uiuc.edu (Darrell Roy Hougen)
Newsgroups: sci.math,alt.books.technical
Subject: Re: High Prices of Math Books. I am pissed.
Date: 5 Jan 1993 18:49:48 GMT
Organization: Center for Reliable and High-Performance Computing, University of Illinois at Urbana-Champaign
NNTP-Posting-Host: focus.csl.uiuc.edu

bathurst@phoenix.Princeton.EDU (Bruce Bathurst) writes:

% Because of this (I suspect) there is no mechanism, as there is in
% medicine, for the cost of expensive necessities to be shared by the
% rest of society.

Do we need this socialist drivel on sci.math?  Look at the state of
medicine in America and tell me whether you think it has benefitted
from massive government intervention.  

%  Many students can't buy even basic texts, others
% sell them back.  Students, as a consequence, are not only less
% educated, but have not learned how to teach themselves, through
% reading.  Those who choose to devote their lives to advancing
% knowledge in basic fields face the choice of purchasing books or food.

Have they suddenly lost the ability to use the libraries?

% Generations of Americans educated their children for a better life.
% The fact that the educated go without luxuries, or sometimes food, is
% not a fact that Americans will soon believe.

The fact that undergrad and grad students can't afford luxuries is
well known.  The idea that some are going without food is ridiculous.
Undergrad students, grad students and professors are already reaping
the benefits of massive state and federal government subsidies of
their education.  Would you like to further increase the burden on the
less well educated to pay for the life styles of the educated?  That
hardly seems fair.  As a grad student myself, I have no sympathy for
other grad students or undergrad students that whine about their
living conditions.  At least college students have a chance to make
their lives better doing something they want to do.  If the result is
not improved living conditions, then some people should consider
changing careers.

Darrell R. Hougen

Newsgroups: sci.math
From: Haavard.Johnsbraaten@tmlh.no (Haavard Johnsbraaten)
Newsgroups: sci.math
Subject: Re: Two (I think) interesting Problems
Date: 8 Jan 93 08:12:19 GMT
Organization: Telemark College of Education


To Gareth McCaughan.

If I have misunderstood "your" folding procedure, I apologize.
I regard point 3 of your construction as a "doubling".
Then one of the angles of the regular pentagon is already 
established in point 2 of the construction.
But this angle is 109.5 degrees and not 108 (the exact value).
I get this both by calculations and by measuring the angle.
Am I right?

I enjoyed "your" folding procedure!  It was new to me.
I hope you also enjoy "mine".

 .            .
Havard Johnsbraten
Xref: sparky sci.math.stat:2719 sci.econ:9591