HDTenEightyP/NetNews huggingface dataset:
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Date:         Thu, 10 Sep 92 12:43:11 -0400
From:         Ian C Jarvie <icj@NEXUS.YORKU.CA>
Subject:      Re: Ibid and Notabene4
Newsgroups: bit.listserv.notabene

I'm sure several of us would be grateful if Michael Obuchowski would
post the detailed step by step explications of what he did to make
Ibid plus install and work with 4.0.  His sketch of his diagnosis and
what he did is opaque to those of us who have never fiddled with NB
program files are even worked out which of them does what.
Also, to those of us still waiting, can anyone say how much disk space
NB 4.0 with Ibid Plus takes up?

--
icj
(I.C. Jarvie, Dept. of Philosophy, York University, Toronto)
<icj@nexus.yorku.ca>
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Date:         Tue, 8 Sep 92 19:35:02 EDT
From:         Tom Schlesinger <tos@OZ.PLYMOUTH.EDU>
Subject:      Re: 1) NB list; 2) PDP 25in1 Deskjet 500 cartridge
Comments: To: NOTABENE@taunivm.tau.ac.il
Newsgroups: bit.listserv.notabene

>
>
>         What is wrong with this list?  I subscribed in 1990, but
> since the 25th August have received no mail whatever.  Mail to the
> TAUNIVM Postmaster has had no reply.  Do I have to re-subscribe?
> list of width tables for the 25in1 Deskjet 500 cartridge.  Is anyone
> --
> **************** Tony Hirtenstein ********************
> tonyh@ibmpcug.co.uk ************* West Oxfordshire ***
>

I too was mysteriously dropped from the list about the same time and did have
to re-subscribe; I thought something had happened to the net connections, and
only when one of computer center people checked the list's member roster did I
find out what had happened.  Weird!
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Date:         Wed, 9 Sep 92 14:54:02 BST
From:         A.K.Henry@CEN.EX.AC.UK
Subject:      Re: UK (and other) Upgrades
Newsgroups: bit.listserv.notabene
              928:22 pm


> .................................. Similarly, SLS will not
> work with 4......

What? Aaaaargh! This is terrible news. Is there a forecast for
improving this situation?

Avril Henry
A.K.Henry@uk.ac.exeter.cen


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Date:         Mon, 14 Sep 1992 17:07:05 ITA
From:         MSANDRI@IVRUNIV.BITNET
Subject:      Dynamical Systems Software Package

Hi frac-l netters,
some days ago a friend of mine told me of a new and powerful PC software
package for the analysis of dynamical system.
If I'm not wrong, it calculates lyapunov esponents, fractal dimension,
Poincare maps, correlation diagram, power spectra and many many other
useful things!
The name is DMC or something similar.
Any  information is welcome!
Thanks in advance. Marco.
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Date:         Tue, 15 Sep 1992 13:04:44 EDT
From:         "(Michael South)" <msouth@GRITS.VALDOSTA.PEACHNET.EDU>
Subject:      Lyapunov

> Can you tell me what Lyapunov represents mathematically?

Jose--

I don't know what mathematical level you are on, but I thought perhaps a
watered down version of what has already been offered in response to the
above question might help.

One way to think about Lyapunov exponents is the following:

Consider two orbits in phase space ("phase space" can be thought of as
a space in which each point represents the condition of the system to be
studied.  For exapmle, suppose you had a mass on a spring.  The phase space
of this system would be a two dimensional plot of position on one axis
and momentum (or velocity, if you like) on the other.  The "orbit" in phase
space is the path that the system follows through that space.  In our
mass-spring example, we might start out with the mass at rest but displaced
from the equilibrium position.  In phase space, this would be represented as
a point on the postion axis (since the momentum is zero).  When we let go of
the mass, the system will gain momentum as the position of the mass
approaches the equilibrium position.  Then, the mass will move past the
equilibrium position and the momentum will begin to decrease again, and
so on.  Through this process, the system will trace out a series of points
in the shape of an ellipse (assuming no friction).  Now is where the fun
begins...)

Suppose we had displaced the mass just a tiny bit further than we did.
What would happen?  Well, we would get another ellipse, just a little
larger than the first one.  Now suppose we watched both of these paths
evolve through time.  Consider the distance between two points that were
initially right next to each other (lets use the starting point, right
where we let go of the mass, as an example).  As time goes on, the points
will remain close together.  This is an example of a nonchaotic system--
the orbits of two points which are initially close will remain close as
time evolves.

A chaotic system, however, would exhibit quite different behavior.  In
a chaotic sytem, the distance between orbits which are initially close
increases exponentially.  This, in fact, is one "definition" of chaos--
i.e., a system which exhibits the above described behavior would be
considered chaotic.

The Lyapunov exponent is a way of quatifying this behavior.  Basically,
we look at the distance between initially close orbits as an exponential
function of time.  If the exponent is zero, we have a nonchaotic system,
as in the mass-spring case.  However, a positive exponent would imply
that the distance is incresing with time, and the system would then be
chaotic.

A nice explanation of this is given in Francis C. Moon's _Chaotic
Vibrations:  An Introduction for Scientists and Engineers_.

Hope this helps.

By the way, I am only a dabbler in this field, so I would welcome
corrections to the above.

Michael South

msouth@grits.valdosta.peachnet.edu
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Subject: (no subject given)
Newsgroups: bit.listserv.frac-l
Date:         Sat, 5 Sep 1992 14:03:02 EDT
From:         Sergei Naumov <serge@SLOTH.ASTRO.UNC.EDU>

Hi, evereybody!!
Who knows, is threre a version of FRACTINT for SunView? Where is it?
Thanks,
	Serge	serge@sloth.astro.unc.edu
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Via:      UK.AC.NSF; 10 SEP 92 22:32:49 BST
Via:      uk.ac.middlesex.vaxa; Thu, 10 Sep 1992 22:31:57 +0100
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Newsgroups: bit.listserv.frac-l
Date:         Thu, 10 Sep 1992 22:31:55 GMT
From:         DAVID1@VAXA.MIDDLESEX.AC.UK
Subject:      EXHIBITION OF FRACTAL ART

The FORTY HALL MUSEUM, at Forty Hill, Enfield, Middlsex England
is exhibiting 83 works of my Fractal Art until 27th September.
So if any of you plan to be in UK LONDON think of FORTY HALL.
Regards David Walter Middlsex University London UK
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Date:         Thu, 10 Sep 1992 18:31:00 MST
From:         TSCMYERS@CC.WEBER.EDU
Subject: Re: THE NUMBER OF POEPLE CREATING FRACTAL PATTERS RNS

I dont know about my face but until I meet GOD ins there somewhere I'm going to
 keep iterating!
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Newsgroups: bit.listserv.frac-l
Date:         Sat, 5 Sep 1992 23:28:34 EDT
From:         Michael South <msouth@GRITS.VALDOSTA.PEACHNET.EDU>
Subject:      Re: Fractint availability

Is there a MAC version of fractint?  If not, is there any software available
by ftp that will perform comparable feats on the MAC?

What is the best fractal software available for MACs (free or otherwise).

Thanks.

Michael South

msouth@grits.valdosta.peachnet.edu
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Date:         Thu, 10 Sep 1992 17:09:00 PDT
From:         GLADSTONE@CSMCMVAX.BITNET
Subject: Re: THE NUMBER OF POEPLE CREATING FRACTAL PATTERS RNS

        As a rough guess, I would say that at least 1%, if not more,
of the micros, minis, and mainframes have spent time Mandelbrotting.
I don't plan of stopping until I see my own face buried somewhere in
the M set.

        > David Walters wonders if there are less than 1000 people
        > engaged in creating fractal images.

Also, at least 1% of the programmers I know do this sort of thing, and
since there must be at least 1E6 programmers unlocked at any given time,
this would up your estimate by an order of magnitude.

Joe ( still wasting cycles ) Gladstone>
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Newsgroups: bit.listserv.frac-l
Date:         Tue, 8 Sep 1992 17:29:08 -0400
From:         "It's so early...Do you know where your processes are?"
              <cordones@ROBERT.NYU.EDU>
Subject: Re: FFT and Signal Processing.

----- Begin Included Message -----
Dear All:

        A while back someone posted a request for information on FFT's
and signal processing.  I wound up sending him some C source code for
an FFT that was basically my first program in C.  I was just wondering
if it worked for him, or if the code was readable/updatable or whatever.
If needed, I could revamp it into a better format with more comments..

FFT's are great, Joe Fourier Rules!!!!!

                                          Michael D. Aesoph
                                University of Pittsburgh - Johnstown


----- End Included Message -----

I am not familiar with what you are talking about but I do Fractal Images, and
 Special Effects. Maybe it would be useful if you posted to the list the source
 you are referring to, and maybe some bibliografical references, etc.

Thanks.

Jose Cordones
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Date:         Mon, 14 Sep 1992 11:28:15 LCL
From:         E$BMS <E$BMS@KBCT.BOEING.COM>
Subject: RE: <huang@c <@pucc.Princeton.EDU:FRAC-L@GITVM1.BITNET>

*** Reply to note of 09/14/92 10:10
FROM: BRYON
Subject: <huang@c    <@pucc.Princeton.EDU:FRAC-L@GITVM1.BITNET>
This was misdelivered.  You may want to try again.

Thanks,
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Subject: (no subject given)
Newsgroups: bit.listserv.frac-l
Date:         Tue, 8 Sep 1992 09:04:58 EDT
From:         Cliff Pickover 914 945-3630 <CLIFF@YKTVMV.BITNET>

Hi, I'm looking for pointers to the literature on the use of
recursion in unusual settings:  literature, art, science, etc. I'm not
really looking for the usual fractal stuff, but some things a little bit
more unusual.  Thanks, Cliff
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Newsgroups: bit.listserv.frac-l
Date:         Wed, 9 Sep 1992 15:29:53 U
From:         Kagan Kaya <kagan_kaya@CBIS.ECE.DREXEL.EDU>
Subject:      subscription to fractal new

                       Subject:                               Time:2:25 PM
  OFFICE MEMO          subscription to fractal news           Date:9/9/92
sub Frac-l Kagan Kaya
From: McClelland_R%PSB%BLS@NIH3PLUS.BITNET
Newsgroups: bit.listserv.frac-l
Subject: Wheels within wheels
Date: 14 Sep 92 12:26:58 GMT
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|Date: 9-14-92  8:25am
|From: McClelland_R:PSB:BLS
|  To: $FRAC-L@GITVM1:BITNET:NIH
|Subj: Wheels within wheels
|In-Reply-To: Message from $FRAC-L@GITVM1:BITNET of 9-12-92
------------------------------------------------------------------
Rollo:

I don't remember who said 'greater vehicle...' but I know what it means.
It is poem about the importance of choosing either Mahayana or Hiniyana
Buddhism.

Rob
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Date:         Mon, 14 Sep 1992 17:16:00 CST
From:         Hal Harris <C1754@UMSLVAXA.BITNET>
Subject:      Re: Dynamical Systems Software Package

The dynamical software system to which you refer may be the one I
reviewed for the Journal of the American Chemical Society a few years
ago.  The reference for the review is JACS _112_, p.2845 (1990).  The
software is Dynamical Software I.4 and II.2, and is sold by
Dynamical Systems, Inc.: P. O. Box 35241, Tucson, AZ.  A demonstration
disk was available at the time I wrote the review for $10.00.  The
package cost was $550.00 at that time.  I suspect that the products
are much improved by now, but I haven't seen very much in the way of
updates.
Hal Harris        c1754@umslvaxa.umsl.edu
Department of Chemistry
University of Missouri-St. Louis
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Date:         Tue, 15 Sep 1992 12:26:18 -0500
From:         Roberto Perli <PERLIR@FASECON.ECON.NYU.EDU>
Subject:      Re: Dynamical Systems Software Package

Marco Sandri writes:

==> Hi frac-l netters,
==> some days ago a friend of mine told me of a new and powerful PC software
==> package for the analysis of dynamical system.
==> If I'm not wrong, it calculates lyapunov esponents, fractal dimension,
==> Poincare maps, correlation diagram, power spectra and many many other
==> useful things!
==> The name is DMC or something similar.
==> Any  information is welcome!
==> Thanks in advance. Marco.

Marco, I also was told by a friend that this software is really
fantastic (by the way its name is truly DMC not
DS, as somebody argued). For example it can calculate fractal
dimensions from both data and models much more quickily than other
packages and the same is true for Lyapunov exponents. My friend told
me that this is because it is written in a new language, developed by
the author, or something like that. It should also be very
portable, in the sense that it can run on many different types
of computers. Another great feature is the
graphics: I have seen some pictures made with DMC that were part of
my friend's paper, and they were really nice. Unfortunately my friend
is working now at the University of Dar el Salaam, Tanzania, and he
has no email there. I really hope that somebody else knows of DMC and
can tell me where I can find it.
Thank you very much to all those who will answer.
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Date:         Tue, 15 Sep 1992 15:23:21 -0400
From:         "(Cogito)" <cordones@SACCO.CS.NYU.EDU>
Subject: Re: Lyapunov

Thanks to those who offered an explanation to my question on Lyapunov exponents.
 I found both to be explicit enough...with some more thought I will feel
 familiar about it. By the way, one of the explanations (Michael South) sounded
 very much like chapter 3(?) on Dynamical systems of the book that I am reading
 right now; Chaos. Answering Michael's question, I have some knowledge of
 calculus and physics. Whether fractals influenced me to change majors to
 b.a/m.a. in mathematics just a few days ago is a dirty little secret :). I am a
 freshman at The City College of NY, but have 5 years experience with computers
 and one year with Fractal drawing programs.
Updating about the fractal I was drawing, it finished this morning...total time
 (rounded to the nearest hour) was 129 hours!

Jose Cordones
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Date:         Tue, 8 Sep 1992 08:14:00 CST
From:         Hal Harris <C1754@UMSLVAXA.BITNET>
Subject:      Recursion reference

I assume you have already read "Godel, Escher, and Bach- An Eternal
Golden Braid", by Hofstader.  Is that the kind of thing you are looking
for?
Hal Harris   C1754@UMSLVAXA.UMSL.EDU
Chemistry Department
University of Missouri-St. Louis
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Date:         Fri, 11 Sep 1992 13:09:50 EDT
From:         McClelland_R%PSB%BLS@NIH3PLUS.BITNET

|Date: 9-11-92  1:05pm
|From: McClelland_R:PSB:BLS
|  To: frac-l@gitvm1:bitnet:nih
|Subj: [No Subject]
------------------------------------------------------------------
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Date:         Tue, 8 Sep 1992 08:54:35 CDT
From:         "Michael L. Kaufman" <kaufman@DELTA.EECS.NWU.EDU>
Subject:      Re: your mail
              945-3630" at Sep 8, 92 9:04 am

> Hi, I'm looking for pointers to the literature on the use of
> recursion in unusual settings:  literature, art, science, etc. I'm not
> really looking for the usual fractal stuff, but some things a little bit
> more unusual.  Thanks, Cliff

Have you looked at _The Recursive Universe_ by WIlliam Poundstone?

Michael
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Subject: (no subject given)
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Date:         Sat, 5 Sep 1992 14:13:05 EDT
From:         Ralph Frisch <RFFCC@CUNYVM.BITNET>

Thanks, I did, I _am_ on the list now, there was nothing worth saving.
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Return-Path: <wgchoe@sol.postech.ac.kr>
Newsgroups: bit.listserv.frac-l
Date:         Tue, 15 Sep 1992 22:33:40 KDT
From:         "(Choe Won Gyoo)" <wgchoe@SOL.POSTECH.AC.KR>

	Hi. One of my friend asked me if i have any idea for tracing the
boudary of mandelbrot set. He wants to design a graphical demo ; draw
M-set at coarse grain , and then zoom in the details. He tried to recalculate
the whole picture in finer grain, but it takes too much time, and moreover,
the 'interior' of the set remains intact, so he wants to trace
the boundaries and draw some small neighbourhood of the boundary
 only, rather than the whole image.

	Does anyone know a "practical" algorithm to trace M-set boundaries? or
Is there any mathematical expression for it ?


	Thanks in advance.

							wgchoe@sol.postech.ac.kr
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Date:         Mon, 7 Sep 1992 10:55:39 -0400
From:         John Corbit <corbit@ESSEX.STFX.CA>
Subject:      RE: Fractal software for MAC

Re: fractal programs for the Macintosh

In addition to MandelZot by Dave Platt there is Mandella by Jesse Jones.
These are both available on sumex-aim.stanford.edu in info-mac/app.

Also Paul Bourke at Univeristy of Auckland in New Zealand has written
several excellent fractal programs. One named Fractal does a variety of
fractals and chaotic attractors as well as the standard M-set and J-set
computations. He has also written a superb L-systems program with an
excellent interface and considerable power. Bourke's programs are available
by anonymous ftp to ccu1.aukuni.ac.nz.

John Corbit  <corbit@essex.stfx.ca>
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Date:         Mon, 14 Sep 1992 11:59:25 EST
From:         rlinh <rlinh@MAILGATE.ENGNET.UFL.EDU>
Subject:      Re: Signoff via Dave Re

          Yes...I would like to be removed from the list.
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Date:         Wed, 9 Sep 1992 16:23:35 EDT
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From:         "Norman D. Fletcher" <U7542NF@DOENE.BITNET>
Subject:      (U) SYSTEM TEST

From: Norman D. Fletcher

THIS IS A SYSTEM TEST.
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Date:         Tue, 15 Sep 1992 07:17:46 -0600
From:         RSILVER@LANL.BITNET
Subject:      Re: magnification

Tim Wegner asked:
> Can anyone tell me the standard definition of magnification? My
> understanding that an image in the complex plane of height 2.0 has
> magnification of 1. Is this correct? What software uses center-
> magnification coordinates, and is the scheme pretty standard? Thanks.

* Tim, that's pretty much correct, at least for images that are wider
than high.
I've gotten a fair amount of flak for using that definition of
"magnification" though, e.g. does such an image printed 10 x 8" have
the same magnification as the same image blown up to 100 x 80"?

To get around that hastle I coined the word "suidar" ("radius"
backwards) for the reciprocal of the radius of the largest circle that
can be inscribed in the image (in the complex plane).

MandelZot, Dave Platt's fractal program for the Macintosh, allows
either center-mag specification, or corners. Here "mag" is either
X-mag, Y-mag, or suidar, which I regard as an embarassment of riches.
I often specify the wrong one.

I'd say center-mag is pretty standard in a sense, but not completely,
since "mag" itself isn't standard.

The advantage of center-mag over corners is, of course, that you have
only two possibly large-precision numbers to specify (center-x and
center-y) instead of four.

--Rollo Silver <rsilver@lanl.gov>
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Date:         Mon, 14 Sep 1992 11:59:24 EST
From:         rlinh <rlinh@MAILGATE.ENGNET.UFL.EDU>
Subject:      No Subject Given

          I would like to be taken off FRAC-L
          I have tried all the normal procedures.
          Nothing has worked.
          Could somebody manually take me off the list??

          RLINH@MSE.UFL.EDU
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Subject: (no subject given)
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Date:         Fri, 11 Sep 1992 13:09:57 EDT
From:         McClelland_R%PSB%BLS@NIH3PLUS.BITNET

|Date: 9-11-92  1:06pm
|From: McClelland_R:PSB:BLS
|  To: frac-l@gitvm1:bitnet:nih
|Subj: [No Subject]
------------------------------------------------------------------
I'm new to this list server. Did anyone on this list attend the
"complexity & chaos II" conference at Bryn Mawr last month?

Rob McClelland
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Date:         Tue, 8 Sep 1992 16:12:08 EDT
From:         glenn miller <mill6852@MSTR.HGC.EDU>
Subject:      Publications in J Comp & Graphics

Hi Cliff,
I was wondering if you could tell me if my paper (submitted about
a year ago and accepted) was going to appear in the Journal of
Computer & Graphics, I would like to get some reprints of it. Last
year you said it should appear this October. The paper was about
a tutorial on the visualization of Seigel disks for the quadratic
Julia sets. Thanks,

G. Todd Miller
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Date:         Thu, 10 Sep 1992 22:22:08 GMT
From:         DAVID1@VAXA.MIDDLESEX.AC.UK
Subject:      THE NUMBER OF POEPLE CREATING FRACTAL PATTERS  RNS

Woulp people try to estimate the number of people creating patters using
fractals - woiuld it be less than 1000 people in the workl  ld?
Thanks David Walter Middlesex University London England.
From: 92marsh@gw.wmich.edu
Newsgroups: bit.listserv.frac-l
Subject: joining
Date: 13 Sep 92 23:25:38 EST
Organization: Western Michigan University

         Hello,
           I would like to join Frac-l.

         Charles Marsh
         92marsh@gw.wmich.edu
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Date:         Sat, 5 Sep 1992 13:23:38 EDT
From:         Len Alshan <LMACC@CUNYVM.BITNET>
Subject:      Waite Group Publications

I recently saw mention (an ad?) for several different NEW publications
from the Waite Group -- one by Tim Wigner (Pic Lab?); another dealing with
Virtual Reality and two or three others.  Anyone have any info on these
books -- availability, price, content, etc ?
Len
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Return-Path: <twegner@mwunix.mitre.org>
Full-Name: Timothy Wegner
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Date:         Mon, 14 Sep 1992 13:25:55 -0400
From:         Timothy Wegner <twegner@MWUNIX.MITRE.ORG>
Subject:      magnification

Can anyone tell me the standard definition of magnification? My understanding
that an image in the complex plane of height 2.0 has magnification of 1. Is
this correct? What software uses center-magnification coordinates, and is
the scheme pretty standard? Thanks.
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