HDTenEightyP/NetNews huggingface dataset:
From: fc03@ns1.cc.lehigh.edu (Frederick W. Chapman)
Newsgroups: sci.math.symbolic
Subject: Re: What about MathCad...?
Date: 21 Jan 93 16:23:50 GMT
Organization: Lehigh University

In article <9610001@hpfcso.FC.HP.COM>, wayne@hpfcso.FC.HP.COM (Wayne
Covington) writes:

>digennar@fcs280s.ncifcrf.gov (Frank S. DiGennaro) asked for opinions
>on MathCad.  So in a further effort to provoke a response from any MathCad
>users out there ...
>
>The advertisement with the $79 offer tells a person very little about what
>it can and cannot do.  So I visited some computer bookstores yesterday in
>hopes of learning more, but none of them had any books on MathCad.  Nor do I
>recall many MathCad postings in this group, even after Frank posted his
>inquiry.  If they are on version 3.1, it must have been around long enough
>to acquire a following.  Perhaps MathCad is shunned because its capabilities
>fall short of those of Maple, Mathematica, and other commonly mentioned
>computer algebra systems?

MathCAD was originally a NUMERIC computation package rather than a
SYMBOLIC computation package.  Although MathCAD for MS-Windows now
includes parts of Maple, the orientation is still very heavily on
NUMERICS rather than SYMBOLICS.  That is probably why you don't see it
mentioned often in sci.math.symbolic.  Try sci.math.num-analysis --
you might have better luck there.

Fred Chapman
-- 

o ------------------------------------------------------------------------- o
|  Frederick W. Chapman, User Services, Computing Center, Lehigh University |
|    Campus Phone:  8-3218     Preferred E-mail Address:  fc03@Lehigh.Edu   | 
o ------------------------------------------------------------------------- o
|             Ecstasy is transitory, but a theorem is forever!              |
o ------------------------------------------------------------------------- o
From: david@ecu.unice.fr (David Menasce)
Newsgroups: sci.math.symbolic
Subject: homoclinic orbit and DS-Tool
Date: 22 Jan 1993 15:33:47 GMT
Organization: University of Nice Sophia-Antipolis
NNTP-Posting-Host: ecu.unice.fr


Hello,
does anyone know a solution to my problem ?
I plot a homoclinic orbit with DS-Tool and I'd like to check the  
asymptotic behavior of the solution. Roughly speaking: I find a solution,  
say h(t), which goes to infinity as t goes to + and - infinity. The  
problem is that I have this solution only numerically, and when I  
integrate the solution for a big value of t, this solution explodes.  
Nevertheless I'm sure of the existence of this solution, and I know that  
it has to converge to 0 (for t goes to + infinity) like exp(-t) or  
t*exp(-t). I'd like to check it (numerically of course).
Can anyone help me ?
I would greately appreciate suggestions or references. Please reply by  
E-mail.
Thanks
        David Menasce  (david@ecu.unice.fr)

Newsgroups: sci.math.symbolic
From: poem_fv@wm.estec.esa.nl (POEM Frederic Vermenouze)
Subject: Small problem
Reply-To: poem_fv@wm.estec.esa.nl
Organization: ESA/Estec/WMS, Noordwijk, The Netherlands
Date: Fri, 22 Jan 1993 17:45:07 GMT

Could anyone help me solvr the following equation :
't' is the time, 'a' a variable of the time

( d(a(t))/dt )^2 + b^2 *(sin(a))^2 = c

'c' and 'b' are constants.

Thanks for your help 
Fred
Newsgroups: sci.math.symbolic
From: thng@atri.curtin.edu.au (Ian Li-Jin Thng)
Subject: Symbolic Fortran : Help Needed
Reply-To: thng@atri.curtin.edu.au
Organization: Australian Telecommunication Research Institute
Date: Fri, 22 Jan 93 08:15:40 GMT

G'day to all symbolic netters,

I'm seeking assistance on anyone who has experience with or have
come across references regarding symbolic programming using Fortran 
77 . 

I know that a common method of symbolic programming is to use 
pointer structures which Fortran 77 do not support. 

I have at present a Fortran program which is numerically intensive 
at the moment. I need to add a section to that program which is 
unfortunately symbolically intensive. The requirements of the 
symbolically intensive portion are as follows :

Essentially to find out the symbolic expressions for the partial 
derivatives of  

    w(T) . Q . w  

where

   (T) denotes transpose of a vector or matrix

    w is a vector whose elements consists of different variables
    eg : w = [2 , 2a+b, a^2, b^4, 3a , 4c-a, 4, 5.6 ](T)

    Q is a matrix whose elements are similar to the elements in w,
    ie , they can be symbolic elements or purely numerical entries

Help is needed on how to program in Fortran 77 to solve the following 
problems :

a) How to represent these vector structures and matrix structures
   elegantly.

b) Perform matrix operation (ie multiplications, additions, subtraction) 
   properly on these structures

c) Sort the variables out ,say, in ascending orders of the variable 'a',
   followed by variable 'b' and finally in variable 'c' .

d) Obtaining the partial derivatives of  w(T) . Q . w  wrt variables 'a'
   'b'  and  'c' .

 
I would really appreciate anyone who can provide info on the above
problems . You can contact me at ...

  
------------------------------------------------------------------------------
                 Ian Thng  - Forever Trying to be Young  
                 Email:thng@atri.curtin.edu.au
                 Adaptive Signal Processing Laboratory
                 Australian Telecommunications Research Institute
                 Curtin University of Technology
                 Ph :  +61-9-3513270
                 Fax : +61-9-3513244 
                 Bothered with seat belts ? Ride a Harley Mate !
------------------------------------------------------------------------------

A thousand thanx in advance to all who can help me out !
Newsgroups: sci.math.symbolic
From: katherle@daisy.uwaterloo.ca (Kate Atherley)
Subject: Re: Maple for Windows..(Is that 3.x or NT?)
Organization: University of Waterloo
Date: Thu, 28 Jan 1993 18:06:29 GMT

In article <7005@dciem.dciem.dnd.ca> hugh@dciem.dciem.dnd.ca (Hugh D. Gamble) writes:
>In article <1993Jan21.082220.19604@husc3.harvard.edu> gouvea@zariski.harvard.edu (Fernando Gouvea) writes:
>>Will either of these run under OS/2?
>
>Better yet, how about a native OS/2 port.
>(after updating the Amiga port, of course :-)

Updating the Amiga port is underway.  We are currently discussing
doing an OS/2 port - it depends on customer demand.  If you are
interested, please let us know - mail info@maplesoft.on.ca.

Kate
Waterloo Maple Software Technical Support
support@maplesoft.on.ca
Xref: sparky sci.math:18671 rec.arts.books:26074 sci.philosophy.meta:3134
From: system@kalki33.lakes.trenton.sc.us (Kalki Dasa)
Newsgroups: sci.math,rec.arts.books,sci.philosophy.meta
Subject: Re: Hare Hare?  (Re: Geometry = the mind of God.)
Date: Thu, 21 Jan 93 19:45:27 EST
Organization: Kalki's Infoline BBS, Aiken, SC, USA

jwo@cs.cornell.edu (John W. O'Leary) writes:

> >       ---------------------------------------------------------
> >      |                Don't forget to chant:                   |
> >      |                                                         |
> >      |  Hare Krishna Hare Krishna, Krishna Krishna Hare Hare   |
> >      |       Hare Rama Hare Rama, Rama Rama Hare Hare          |
> >      |                                                         |
>           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> What is this nonsense doing in sci.math?

This is not nonsense. It is good sense. Anyone who reads it will
experience extreme good fortune. Besides, this is a signature, not a
message body. The statement about "Moe, Larry, Curly..." was part of the
message body, and therefore it is categorically different from my
signature. Furthermore, since everyone knows that the Three Stooges are
deliberate embodiments of nonsense, whereas everyone knows that Hare
Krishna is deliberate truth, there is no comparison between my signature
and the foolish rantings of some atheist.

Nice try, demon.

Sincerely,
Kalki Dasa


       ---------------------------------------------------------
      |                Don't forget to chant:                   |
      |                                                         |
      |  Hare Krishna Hare Krishna, Krishna Krishna Hare Hare   |
      |       Hare Rama Hare Rama, Rama Rama Hare Hare          |
      |                                                         |
      |    Kalki's Infoline BBS Aiken, South Carolina, USA      |
      |           (kalki@kalki33.lakes.trenton.sc.us)           |
       ---------------------------------------------------------
Xref: sparky sci.math:18761 sci.physics:23473
From: mccolm@darwin.math.usf.edu. (Gregory McColm)
Newsgroups: sci.math,sci.physics
Subject: Re: Ian Stewart's "Mathematical Recreations" column
Date: 21 Jan 93 23:20:17 GMT
Organization: Univ. of South Florida, Math Department

In article <1993Jan16.194757.5541@netcom.com> doug@netcom.com (Doug Merritt) writes:
>In article <1993Jan16.035852.25619@leland.Stanford.EDU> ilan@leland.Stanford.EDU (ilan vardi) writes:
>> [regarding "quarks": ] What I find truly annoying in this case is the
>>conscious decision by the scientist to give them a catchy name that is
>>totally disjoint from their properties.
>
>Ok, first off I don't know why you think "quark" is catchy. Most people
>(lay and not) that I've talked to simply think it's *weird*.
>
>Secondly, there is a very old tradition that gives the right to name
>something to its discoverer/inventor. Sometimes there is an expectation
>of following other rules (e.g. naming astronomical objects after oneself
>is fair game but that's a no-no with mathematical theorems), it's true,

Not any more.  In fact, not for a while---otherwise, St. George's 
planet would be orbiting the sun.  Both astronomy and biology 
have committees of experts who approve the names.  This becomes 
apparent when some eccentric (like the late Dr. Leakey) gets in 
a fight with them.  But we needn't bow to them:  when the 
committees decided that the boa constrictor should be called 
"constrictor constrictor", Will Cuppy, a reviewer for The New 
Yorker, decided that it should not, saying "two can play that 
game."

-----Greg McColm

PS:  Let's keep the committees out of mathematics, shall we?

--
SHAMELESS AD:  Math PhDs in Analysis, Discrete Math./Th. of Comp., Num. Anal., 
Prob., are invited to apply to the Math. Dept. of Univ. of S. Florida for 
research/teaching positions that may be available: contact K. L. Pothoven at 
mathdept@math.usf.edu. Deadline 2/1/93. USF is a politically correct employer.
From: mccolm@darwin.math.usf.edu. (Gregory McColm)
Newsgroups: sci.math
Subject: Re: Undivided distaste for algebra: math's a waste
Date: 23 Jan 93 22:46:31 GMT
Organization: Univ. of South Florida, Math Department

In article <C14rE7.3M2@panix.com> davidc@panix.com (David B. Chorlian) writes:
>In <1993Jan19.100151.27399@leland.Stanford.EDU> ilan@leland.Stanford.EDU (ilan vardi) writes:
>
>>In fact, a lot of knowledge has been lost. For example, very few
>>people nowadays know that the stars revolve around the earth 366 1/4
>>times a year? I suppose that everyone who has looked at the night sky
>>would know this. The point is that this observation, which is the clearest
>>evidence that the earth goes around the sun, is not well known among
>>people who ``know'' that the earth goes around the sun. 
>
>>-ilan 
>
>Sorry, but this is consistent with geocentrism.  Looking at it
>historically, the best single piece of empirical evidence is the
>discovery of the phases of Venus in 1610 (S. Drake, _Galileo at
>Work_, p. 164).
>
>[...]

According to a recent NSF survey of 2,041 adults 18 and older, 
21 % believe that the Sun orbits the Earth, 72 % said that the 
Earth orbits the Sun, and the rest didn't know.  Of those who 
said that the Earth orbited the Sun, 45 % said that it took a 
year, the others having different times or not knowing.

Another study by MIT and Northern Illinois of 1,111 adults had 
24 % saying that the universe was expanding.  37 % said that the 
Sun will eventually burn out, while 25 % said that the Sun was 
a "planet".

I seem to recall a University of Florida study of adults in 
Florida in which about 75 % said that the creation account in 
Genesis was literally correct.  A major creationist responded 
by claiming that the correct figure was about 85 %.

-----Greg McColm
--
SHAMELESS AD:  Math PhDs in Analysis, Discrete Math./Th. of Comp., Num. Anal., 
Prob., are invited to apply to the Math. Dept. of Univ. of S. Florida for 
research/teaching positions that may be available: contact K. L. Pothoven at 
mathdept@math.usf.edu. Deadline 2/1/93. USF is a politically correct employer.
From: mbeattie@black.ox.ac.uk (Malcolm Beattie)
Newsgroups: sci.math
Subject: Re: Alephs again
Date: 22 Jan 93 13:52:10 GMT
Organization: Oxford University Computing Service, 13 Banbury Rd, Oxford, U
Originator: mbeattie@black

In article <1993Jan20.155553.19920@cadkey.com> dennis@cadkey.com (Dennis Paul Himes) writes:
>In article <1jh2epINN15k@gap.caltech.edu> allenk@ugcs.caltech.edu (Allen Knutson) writes:
>>ydavid@dxds04.cern.ch (David Yann) greets us, and asks a bunch of
>>set-theory questions. I'll state at the beginning: if one has the
>>Axiom of Choice, much cardinal arithmetic becomes trivial.
>>Without it, most things are hard (a countable union of countable
>>sets can be uncountable, for instance).
>>
>     Is this true?  What is wrong with the following enumeration?
>     Let f(i,j) be the i^th element of the j^th set, both indices starting
>at zero.  Enumerate the union as follows:
>n = 0;
>for (i0 = 0; ; ++i0) {
>    for (i1 = 0; i1 <= i0; ++i1) {
>	   enumeration[n++] = f (i1, i0 - i1);
>    }
>}
>	Or, for those of you who don't know C,
>f (0, 0),
>f (0, 1), f (1, 0),
>f (0, 2), f (1, 1), f (2, 0),
>f (0, 3), f (1, 2), f (2, 1), f (3, 0),
>etc.
>	Some work would have to be done to eliminate duplicates, but I don't
>see how this depends on AC or how this would not apply to any countable
>union of countable sets.

Here is the problem: what do you mean by *the* $i$th
of *the* $j$th set?
The explanation is going to hinge on the difference
between a set being _countable_ and a set being _counted_.
For a set to be _countable_ just tells us that there _exists_
some bijection with \omega; whereas a set being _counted_ (*)
means that we are _given_ such a bijection.

You may well be able to fill in the details for yourself now,
but if not, let's start from scratch.
Let {A_j | j \in J} be a family of countable sets such that
J is countable too.
Certainly, we can pick and fix a bijection of J with \omega
(there is only one `choice' to make) and use this bijection
to enumerate the family of A_j as A_1, A_2, A_3, ...
Now we have an infinite number of A_j, each of which is
countable. Howeverm, there is no _given_ bijection of each
A_j with \omega. This means that to enumerate each A_j
as {a_j1, a_j2, a_j3, ...} we have to _pick_ a bijection
of that A_j with \omega. This involves an infinite number
of choices (i.e. one for each j \in J) and cannot be done
without some form of Choice axiom.
I think one can get by with an axiom of `countable choice'
but I'm not sure.

(*) The use of the word `counted' isn't very common, but it
makes a useful distinction here which helps to explain things.
I can't remember where I saw the distinction presented this way.

--Malcolm

-- 
Malcolm Beattie <mbeattie@black.ox.ac.uk> | I'm not a kernel hacker
Oxford University Computing Services      | I'm a kernel hacker's mate
13 Banbury Road, Oxford, OX2 6NN (U.K.)   | And I'm only hacking kernels
Tel: +44 865 273232 Fax: +44 865 273275   | 'Cos the kernel hacker's late
From: hart@de01.denver.waii.com (Doug Hart)
Newsgroups: sci.math.stat
Subject: Re: "Contagious" Distribution
Date: 28 Jan 93 16:19:37 GMT
Reply-To: hart@de01.denver.waii.com
Organization: Western Geophysical

In article <1993Jan26.200021.18490@news.acns.nwu.edu>, lapin@casbah.acns.nwu.edu (Gregory Lapin) writes:
|> 
|> I have been presented with the problem of recognizing a "Contagious"
|> distribution, which has been described to me as a distribution of items
|> that are clustered.
|> 
|> I have not been able to find any references to this type of distribution.
|> If anyone knows of such references, or another name that describes this,
|> please either respond to this newgroup or by email.
|> 
|> Thanks,
|> 
|> Greg Lapin
|> glapin@nwu.edu

In the 3rd edition of Mood, Graybill, and Boes, _Introduction to the Theory
of Statistics_, they discuss contagious distributions in section 4.3 of 
chapter 3. 

Doug Hart
hart@de01.denver.waii.com
From: michaud@masg1.epfl.ch (Pierre-Alain Michaud)
Newsgroups: sci.math.stat
Subject: Data on AIDS in USA
Date: 25 Jan 93 15:38:28 GMT
Organization: Ecole Polytechnique Federale de Lausanne

Hello,

I am looking for data concerning AIDS in the United States. Two questions:

o  Is there some public data base on AIDS, and if so, how to connect?

o  Particularly, I am interested in the number of diagnosted cases per
   6 months in the United States. The data should be as actual as
   possible.

Maybe there exists some FAQ on statistics and AIDS, or do I have do
consider another news group?

Thanks in advance!!				PAM
From: wbdst+@pitt.edu (William B Dwinnell)
Newsgroups: sci.math.stat
Subject: Re: Fit a circle to (x,y) datapoints?
Date: 26 Jan 93 19:20:20 GMT
Organization: University of Pittsburgh


I don't know much about SAS, nor how much coding you could do in it,
but fitting a circle to a set of data points would be trivial for a
genetic algorithm. Frankly, I don't understand why GA's aren't used
more often, especially as they are limited by the weaknesses of 
least-squared error systems. Anyway, I'd specify the circle as
x and y of the center, and r, the radius.
From: retzer@convex.csd.uwm.edu (Joe J Retzer)
Newsgroups: sci.math.stat
Subject: Re-basing data
Date: 28 Jan 1993 19:37:27 GMT
Organization: University of Wisconsin - Milwaukee
Reply-To: retzer@convex.csd.uwm.edu
NNTP-Posting-Host: 129.89.7.30
Originator: retzer@convex.csd.uwm.edu

I am working with an index of industrial production (not seasonally
adjusted) and I ran into a problem. The base year changed from 
1977 to 1987 mid way through the data. I found a source (EconData at
Univ. of Maryland) which has the series via anonymous ftp and they
somehow managed to re-base it all to 1987. The 
problem however is that they dont go back as far as I need to go in
the data. I've contacted them to ask about this, my message was
reffered to someone else and I havent heard a thing since. My question
is this: Is there a way to re-base the series and/or is there another
source which might have the re-based series over a longer time span?

		      Many Thanks in advance,
			Joe
From: ccusekh@prism.gatech.EDU (Kevin Hodge)
Newsgroups: sci.math.stat
Subject: Re: PC version of BMDP
Date: 27 Jan 93 02:19:53 GMT
Distribution: usa
Organization: Georgia Institute of Technology

In <18155@umd5.umd.edu> mtitus@umsa.umd.edu (Marvin A. Titus) writes:

>I am making this inquiry for a friend. Does anyone know if there is a PC
>version of BMDP? I would really appreciate any responses to this
>question!


There are actually several versions of BMDP, depending on CPU and amount
of RAM.  If you have at least an 8088 or 8086 you can use BMDP PC-90.
If you have at least an 80286 there is BMDP 286/extended (takes advantage of 
extended memory).  If you have at least an 80386 and at least 3MB of extended
memory and a math coprocessor, then you can use BMDP 386/Dynamic.  
386/Dynamic will use up to 16MB of extended memory.  Call BMDP at
(213) 479-7799 (Pacific time) for more particulars regarding memory
requirements and math coprocessor requirements.  Also, they have a pretty
good site license deal, as I recall.  As you can imagine with the right
hardware, 386/Dynamic is a very powerful stats package for the PC. 
-- 
Kevin A. Hodge                |   "I'll show you a life of the mind!"
Engineering Psychology        |            Madman Mundt
Georgia Tech                  |
Newsgroups: sci.math.stat
From: warrenk@cix.compulink.co.uk (Warren Kovach)
Subject: Re: Systat for Win 3.1 Anyonbe ??
Reply-To: warrenk@cix.compulink.co.uk
Date: Tue, 26 Jan 1993 20:40:00 +0000


> +From         : roger@glenn.uwaterloo.ca (Roger De Abreu)
> Has anyone used Systat for Windows yet?  I am curious how different it is
> from the DOS version in utility and functionality ??  

Systat for Windows seems to have all the functionality of the DOS
version. In fact, in many ways it seems as if it is just the DOS
version running in a window.  The stats results are scrolled in a
window just like on a DOS screen.  The graphics are identical to the
DOS graphics; they don't even use the Windows fonts.  It even draws
the cluster diagrams with ASCII characters in a scrolling window
rather than as a graphic.

I haven't done a detailed comparison, but it seems as if all the
analyses that are in the DOS version are in the Windows version.
You can type commands and run command files just like in the DOS
version.  You can bypass these and use the menus and "QuickStat"
buttons, but I'd say if you are used to the DOS version you'll feel
quite at home with Systat for Windows.  It has a few nice features,
like you can click on a data point on a scattergram and that datum
will be highlighted in the data editor, which you can have displayed
beside the graph.  You can also cut and paste between Systat and
other Windows programs.

If you use Windows for other things anyway it's worth getting.  It's
not worth changing to Windows just to use Systat for Windows, though.
--
Dr. Warren L. Kovach              Internet: warrenk@cix.compulink.co.uk
Kovach Computing Services                       CompuServe: 100016,2265
85 Nant-y-Felin                           
Pentraeth, Anglesey, Wales LL75 8UY U.K.   
Newsgroups: sci.math.stat
From: blanton@mksol.dseg.ti.com (John F Blanton)
Subject: Desperate situation
Organization: Texas Instruments, Inc
Date: Tue, 26 Jan 1993 18:32:34 GMT

THIS IS A HOMEWORK PROBLEM

The game of Russian roulette consists of the following steps:

a.  Load a 6-shot revolver with 1 bullet and 5 empty chambers.
b.  Spin the cylinder.
c.  Point the gun at your head and pull the trigger.

On the average, how many times can one person play this game
(steps a, b, c)?

This assignment is due at 5 PM today.  Our class started out with
a mix of theorists and experimentalists.  Now all of the     
experimentalists are dead, and the theorists are confused.

We need help.

(solution tomorrow)

John Blanton
blanton@lobby.ti.com
Newsgroups: sci.math.stat
From: R0264@vmcms.csuohio.edu
Subject: Re: F distribution and relation to Beta Help!
Organization: CSU
Date: Fri, 22 Jan 1993 19:14:28 GMT

In article <1993Jan21.181433.8679@mloeff01.cpchq.cpc.gmeds.com>
pddxt@chalk.cpceng.cpc.gmeds.com (Dino Triantos 575-4386) writes:
 
>
>I'm working on a problem in Mood, Graybill and Boes that asks to find the
>relationship between the F and Beta distributions.  The problem asks:  If
>X has an F distribution with m and n degrees of freedom, show that
>
>		        mX/n
>		 W =   -------       has a Beta distribution.
>		      1 + mX/n
>
>Any suggestions or solutions would be greatly appreciated!
>
>Dinos Triantos
>GM/Midsize Automotive Division
>Vehicle Systems Analysis
>C-P-C Engr. Center Rm# G241
>Fax: (313) 575-7270
>E-mail: pddxt@cpceng.cpc.gmeds.com
Try the change of variables x = nu2/(nu2 + nu1F), where F is the F
variate.  Kendall & Stuart (1963) have such an exercise too.
Newsgroups: sci.math.stat
From: lapin@casbah.acns.nwu.edu (Gregory Lapin)
Subject: "Contagious" Distribution
Followup-To: sci.math.stat
Organization: Northwestern University, Evanston Illinois.
Date: Tue, 26 Jan 1993 20:00:21 GMT


I have been presented with the problem of recognizing a "Contagious"
distribution, which has been described to me as a distribution of items
that are clustered.

I have not been able to find any references to this type of distribution.
If anyone knows of such references, or another name that describes this,
please either respond to this newgroup or by email.

Thanks,

Greg Lapin
glapin@nwu.edu
Newsgroups: sci.math.stat