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fractint-digest       Wednesday, March 11 1998       Volume 01 : Number 129




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

Date: Tue, 10 Mar 1998 13:08:53 -0600
From: "Damien M. Jones" <[e-mail]>
Subject: Re: (fractint) Browser

Ray,

 - Is "Netscape" a browser?

Yes.  A "web browser" (or just "browser") is a piece of software that lets
you look at web sites.  Some people get Microsoft Internet Explorer
pre-installed on their computers when they buy them; other people download
their browser from the Internet and install it.

 - When I am wandering around looking for a particular web-site, or home-page,
 - am I browsing?

Yes, that's browsing.  It's also called surfing, cruising, or whatever
euphemistic word suits your fancy. :)

 - Or is a "BROWSER" a different program that must be added to a computer -
 - in other words, a software option?

It is always software that must be installed on your computer before you
can use it.  But, you can choose which browser you want to use.  If you
don't like the one you have, you can download and install a different one.

 - Even though I am new to the group I must take issue with those who
 - say that docs should be read before time is wasted with needless
 - questions to the list-server group.

To a point, I agree with you.  There is a lot of information in the
FractInt documentation, and just because something is there doesn't mean
it's easily found.  As the documentation gets larger ("better") this
problem increases.  It'd be nice to see a search feature in the help, but I
don't have time to tinker with the code myself. :)

Sometimes it is frustrating to see the same questions asked over and over
again, but it is the nature of mailing lists and discussion groups in
general, whenever there is the possibility of new people joining the
discussion as time goes by.  A lot of discussions keep a FAQ for just this
reason.  FractInt is a big, complex program; I used it for a number of
years, chafing at the 2048x2048 limit, before I "discovered" the divide and
conquer feature that had been there all along.  And yet, it was in the manual!

My point: we all need to be a bit more tolerant.  Yes, it is nice for
people to check the manual and available documentation first to see if
their question is answered.  But we shouldn't scold someone because they
couldn't find the answer they were looking for, even if *we* know where the
answer is.

Damien M. Jones   \\
[e-mail]  \\  http://www.icd.com/tsd/ (temporary sanity designs)
                    \\  http://www.fractalus.com/ (fractals are my hobby)

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Date: Tue, 10 Mar 1998 12:05:01 -0800
From: "Jay Hill" <[e-mail]>
Subject: Re: (fractint) SStools....

> From: Wizzle <[e-mail]>
> Ray...
>
> sstools.ini "ships" with fractint under the disguise of
>
> sstools2.ini
>
> What you need to do is read up a bit on the features sstools.ini controls
> at the Fractint homepage....
>
> http://spanky.triumf.ca/www/fractint/findex.html
>
> or pay attention to postings on the list......or get Jay Hill to tell you
> where his great explanation of sstools.ini is posted (I remember it being
> somewhere).

On my web site I have this in the iFAQ:
http://home.san.rr.com/jayrhill/iFAQ/SSTOOLS_INI.txt

>
> Then...decide how you want to modify sstools2.ini (you can do that in
> notepad) and save the file as sstools.ini in your Fractint directory.
>


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Date: Tue, 10 Mar 1998 15:08:24 -0500
From: "Peter Gavin" <[e-mail]>
Subject: (fractint) Arb-prec digits

Umm, I was just wondering...  How can you figure out what the best amount of
digits to use for arb-prec?  I notice it usually is a certain amount more
than the exponent of the zoom factor, but how many more is enough?  And how
does fractint know when to kick it in?  Is there a certain "tolerance" or
something that it uses?  Oh, and how many digits does fractint have access
to in float-mode, and does it always use them all?

Pete
<[e-mail]>




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Date: Tue, 10 Mar 1998 13:22:42 -0800
From: "Jay Hill" <[e-mail]>
Subject: Re: (fractint) Text won't print

Hi folks,
I am reading poor solutions to a problem caused by web page
design problems. Someone posted a URL of a site discussing
good web page design, things like no blinking text, no scrolling
text, black text on dark blue background....

If you want folk to read and study your page, make it EASY for
them. Forget the cutsy artsy stuff if it is for study and reference.

I have access to a laser printer which will show shades of gray
for colors. Even it has trouble with some pages. I have a ink jet
also which refuses to print a color page unless I switch to the color
cartridge. I pain for the one line someone puts in color.

I copy as txt and the formatting is totally gone. I see one giant
run-on paragraph. My solution? Save as HTML and read in with
a browser with edit capability which lets me set the colors
and background.  It is a lot of trouble and does not easily deal
with the illustrations. Then there are the frame pages...
I usually move on to another site. There are so many others
that are not frustrating.

Bottom line. Keep It Simple on your study and reference sites.

Jay
PS. An example of what I recommend is my iFAQ
http://home.san.rr.com/jayrhill/iFAQ/iFAQ.html
where you will see it is bare minimum and links to
ASCII txt files which you can view, study, print save as
you wish.

> From: Bob Margolis <[e-mail]>
> Wizzle wrote:
> > 1. with the page you want to print open in your browser....select
> > "file....save as" which will download the page with the html code to your
> > own computer....stick it in a folder someplace where you can find it
> > 2. open the page you just downloaded in your browser using
> > "file.....open".....the page should come up against a nice clean white
> > background which will print the text just fine right from your browser.

> Hi Team Fractals:
>
> Here's how I print out from Web sites. Before doing any printing job,
> click on Print Preview to see how the pages will look when they are sent
> to your printer. If it looks fine, then go ahead with the printing job.
> If not, here's where I differ from Wizzle's suggestion. When clicking on
> "save as" don't save as an html page. Rather, save it as (filename).txt.
> This method will eliminate all html control codes from your saved file.
> You'll be able to read your file easily without getting eyestrain from
> trying to read the text among all those control codes.


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

Date: Wed, 11 Mar 1998 22:14:56 -0000
From: Neil Davidson <[e-mail]>
Subject: (fractint) other lists

What other fractint list are there that deal with the more technical issues behind fractint?

I have read of some a while back on this list but cannot find any in the archive i have here

Neil Davidson

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

Date: Tue, 10 Mar 98 18:26:49 +0700
From: "Rob Fargher" <[e-mail]>
Subject: (fractint) Best CPU for Fractint

In fractint-digest V1 #128;
From: "Brian E. Jones" <[e-mail]>
Subject: Re: (fractint) documentation and Good machines
said:

>For all of those thinking of buying a PII chip to speed up Fractint, go
>with a MMX chip.

  Now this is very interesting.  I have an IBM 6x86 P-150+ and have
been considering upgrading.  I would be very interesting in ensuring
that my upgrade would significantly speed up Fractint's rendering.

  So if I understand you correctly, this would be a good reason to
consider an AMD 233 MHz K6 (which has MMX) over a PII 233 MHz?

Cheers,
Rob



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Date: Tue, 10 Mar 98 18:39:39 +0700
From: "Rob Fargher" <[e-mail]>
Subject: (fractint) Best CPU for Fractint

In Fractint-diegest V1 #128
From: "Damien M. Jones" <[e-mail]>
Subject: Re: (fractint) MMX
said:

>Also keep in mind that FractInt directly accesses video memory, which on
>PPro and P-II processors defaults to a very slow access for DOS apps.  When
>FractInt is moved to an environment where it doesn't have to read and write
>from video memory, it will run better on newer processors.  This difference
>is most noticeable on fast images.

  I run Fractint 19.6 in a virtual DOS machine under OS/2 Warp 4.0.  It runs
very, very well there.  Normally, when rendering an image (say one of the
beauties that appears on this list), I'll render it in the background, using on
of the "disk video" modes and go back to reading mail, etc. while the fractal
renders.

   Do I understand you correctly when I read from your statement above that
such a "disk video" mode will render faster than direct display while rendering?

Cheers,
Rob


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

Date: Tue, 10 Mar 1998 18:43:35 -0500
From: davides <[e-mail]>
Subject: Re: (fractint) Browser

Off topic post in reply, but bear with me for a minute. When Ray wrote:

"The Nerve of this guy!
>        Even though I am new to the group I must take issue with those who
>say that docs should be read before time is wasted with needless questions
>to the list-server group. (remainder snipped)"

I emailed an answer back as opposed to posting it. A portion is copied here:
"When you wrote:
"The Nerve of this guy!"

and expressed some exception being taken to the comment the individual
made, may I suggest that his intent was very likely not to be condescending
or insulting. He may have just been having a bad day, perhaps frustrated at
this or that, and wrote in a manner in which he did not intend. This is
very easy to do - I've done it myself, we all have. It is best, usually, to
just let items which may have irritated you to slide by with no response
whatsoever. A _very_ net savvy person who is one of the best in the country
at computer knowledge and so on once wrote concerning "flames" and the
like: "The best response is no response."

I think what the person may have been attempt to say which came across
wrong was that often most questions concerning fractint can be answered by
looking in the documentation that is integral to fractint. While it is true
that the documentation provided with many programs can be sparse and
insufficient, fractint's documentation is, _without doubt so far as I have
ever seen_ the most complete documentation of any program produced.
Especially freeware. Believe me. I printed the damn (oops) thing out - to
the tune of somewhere close to 300 pages! Covering everything in the world.
In fact, the documentation is so massive it is almost too complete. This in
and of itself can be daunting to look at, especially if one is unfamiliar
with the program and is still new to making fractals and so on. In this
case some questions which may be covered in the documentation may very well
be expected...

My biggest embarrassments come when I cannot find a procedure to do
something in a program I have, including in the docs and so on, write up a
question concerning it, email the question, and 30 minutes later while
going through the doc's again, or more likely just tinkering with the
program, find the answer myself. And then I get to sit back and wait for an
email answer and you know the person answering is thinking: "Hasn't he even
looked?" But it happens. Nothing to be really concerned about...

Point being intuitively self explanatory.
Thanks for bearing with me...


[e-mail]
Back up my hard drive?
How do I put it in reverse?

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

Date: Tue, 10 Mar 1998 18:05:23 -0600
From: "Damien M. Jones" <[e-mail]>
Subject: Re: (fractint) Best CPU for Fractint

Rob,

 - I run Fractint 19.6 in a virtual DOS machine under OS/2 Warp 4.0.  It runs
 - very, very well there.

OS/2 has always had extensive options for DOS boxes that makes it far more
flexible than DOS boxes under Win95.

 - Do I understand you correctly when I read from your statement above that
 - such a "disk video" mode will render faster than direct display while
 - rendering?

Generally, I would think yes, but it depends on the specific image.
However, from your previous message I see you are using a Cyrix 6x86, which
does not have the same problem that PPro and P-II processors have when
accessing video RAM.  If you're considering upgrading that computer, I
would recommend an Intel processor over AMD because the floating-point
performance--what fractals depend on most--is much better on Intel chips.
I switched from a 6x86P120+ to a Pentium-166 and got a much bigger speed
boost for fractals than just 40%.  And FractInt's not even Pentium-optimized.

BTW, Pentium-II processors have MMX support.

Damien M. Jones   \\
[e-mail]  \\  http://www.icd.com/tsd/ (temporary sanity designs)
                    \\  http://www.fractalus.com/ (fractals are my hobby)

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

Date: Tue, 10 Mar 1998 17:10:35 -0700
From: Rich Thomson <[e-mail]>
Subject: Re: (fractint) MMX

In article <[e-mail]> ,
    "Damien M. Jones" <[e-mail]>  writes:
> MMX offers virtually nothing for fractal generation, and it's been covered
> ad nauseam on this list.

"MMX II" may be different though.  What I've been reading is that they
extended the SIMD approach to floating-point computations, which could
imply that an inner-loop M-set computation might be able to compute 8
pixels at a time.  However, I think the bailout test might put some
flies in that ointment.
- --
                                               Rich Thomson
                                               [e-mail]

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

Date: Tue, 10 Mar 1998 18:38:09 -0600
From: "Tim Wegner" <[e-mail]>
Subject: Re: (fractint) documentation

Mark wrote:

> But it's
> not perfect.  The path through "Help" is not always clear.  For my
> part, in future I shall endeavor to make a note of these difficulties
> and provide feedback to the authors.  We can *all* help to improve
> Fractint by documenting problems (real or perceived) with the
> program and documentation.

Actually, you can do better than that. With a copy of the help
compiler, you can actually directly edit the *.src files, compile
them, and add them to fractint.

The only limitation of this is that if you want to change the hot
links, you need a C compiler. My point is that no programming skills
are needed to edit the documentation as long as links aren't changed.

We'd love to have volunteers help with the docs. If anyone would like
to do this, let me know.

Tim


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Date: Tue, 10 Mar 1998 18:40:20 -0600
From: "Damien M. Jones" <[e-mail]>
Subject: Re: (fractint) MMX

Rich,

 - "MMX II" may be different though.  What I've been reading is that they
 - extended the SIMD approach to floating-point computations, which could
 - imply that an inner-loop M-set computation might be able to compute 8
 - pixels at a time.

If AMD's 3D extensions to MMX are any indication, then MMX-II will allow
two single-precision floating-point operations to be performed in parallel.
 The problem with this approach is that like MMX, which only allows
multiplies on 16-bit math, single-precision floating-point just doesn't get
you very far with fractals.  And you only get to do two of these at once,
not eight, so the speed-up will at most be only two-fold.

Damien M. Jones   \\
[e-mail]  \\  http://www.icd.com/tsd/ (temporary sanity designs)
                    \\  http://www.fractalus.com/ (fractals are my hobby)

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Date: Tue, 10 Mar 1998 18:40:29 -0800
From: Wizzle <[e-mail]>
Subject: Re: (fractint) Text won't print

I happen to agree with Jay about lesson pages needing to be easy to access
and am planning on re-doing my artsy navy blue pages in pale gray shortly.

Regarding the documentation discussion, my own solution to many of the
points made is to post as much tutorial information as I can on my
homepages and link to other tutorial or discussion pages to provide an
alternative to documentation.  I will be adding links to Jay's section and
BillNY's material when I re-do my Fractint lessons/hints section. I too
tried to read the documentation that comes with Fractint....which really is
excellent and quite thorough......when I started a year ago.  However, I
don't have the math/programmer's mind that absorbs information in that
format......it simply didn't "click" until I joined this list.

Perhaps what we need is "tutorial stone soup" which Noel might help out
with by adding some links to the existing tutorial pages. Then the
tutorially minded among us could simmer our hints and lessons pages and
link to each other. The folks on the list would be benefited by being able
to refer the befuddled to the tutorial links.  What do you think?

Nother topic....

Tim made a call for suggestions for better color maps to bundle with
Fractint.  I'm certainly willing to offer up my favorites which include
maps I've "borrowed" from Chessiecat, Gumbycat, Sylvie, Les, Paul
C....well....my list goes on and on.....plus some of my own. I don't
believe this area should be left to just one or two people as we all have
strong color preferences and the bundled maps ought to provide a sampling
of what I think of as "map types".....i.e. maps with gradients of varying
periodicity (new word), stripes (yuck), areas of black.....etc. Good maps
make for good fractal images and are particularly important for the
beginner. Please email me at

[e-mail]

if you would like to discuss this topic. I volunteer to "hold the
paintbrush" and compile suggestions.

Angela


>Hi folks,
>I am reading poor solutions to a problem caused by web page
>design problems. <<snipped>>
>If you want folk to read and study your page, make it EASY for
>them. Forget the cutsy artsy stuff if it is for study and reference.
><<snipped>>
>Bottom line. Keep It Simple on your study and reference sites.
>
>Jay


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

Date: Tue, 10 Mar 1998 19:07:06 -0800
From: Wizzle <[e-mail]>
Subject: Re: (fractint) Carr3371

George....

How is this formula different than Bob's formula? Should I be keeping both
and giving them different names? I have no idea about if....else. Can I
overwrite Bob's formula and still produce his images?

Angela

At 10:55 AM 3/9/98 -0500, you wrote:
>Friends,
>
>Here is an "if..else" rewrite of Bob's recently posted formula:
>
>
>Carr3371 (YAXIS) {; Modified Sylvie Gallet frm.1996
>                  ; Rewritten for if..else by George Martin 3/9/98
>                  ; passes=1 needs to be used with this PHC formula
>  pixel=-abs(real(pixel))+flip(imag(pixel))
>} <<formula snipped>>
>
>
>George Martin


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Date: Tue, 10 Mar 1998 21:02:13 -0600 (CST)
From: [e-mail] (Paul and/or Joyce Carlson)
Subject: (fractint) Modified Continued Fraction Formula

comment {; Modified continued fraction formula
This formula uses the Mandelbrot set equation in a modified
continued fraction, rendered with the Atan method. The first
par gives an overall image of the Mset using the "ident"
function (ie, no function).  The little "dimples" in these
images are interesting ares to zoom into, each containing a
little Mandy.

Paul Carlson
}

frm:CnFrc_Fnc_Mset {; Copyright (c) Paul W. Carlson, 1998
    ; real(p1) = controls size of elements (1 to 32)
    ; imag(p1)   not used
    ; real(p2) = usually 1
    ; imag(p2)   not used
    ; real(p2) = number of color ranges
    ; imag(p2) = number of colors in a range
    w = z = iter = range_num = bailout = 0
    c = pixel
    num_ranges = real(p3)
    colors_in_range = imag(p3)
    :
    prev_w = w
    k = w * w + c
    w = k - fn1(p2/(k+p2/(k+p2/(k+p2/(k+p2/(k+p2))))))
    IF (abs(real(w)) > p1)
    bailout = 1
    angle = abs(atan((imag(w)-imag(prev_w))/(real(w)-\
        real(prev_w))))
    index = 2 * colors_in_range * angle / pi
    z = index + range_num * colors_in_range + 1
    ENDIF
    range_num = range_num + 1
    IF (range_num == num_ranges)
    range_num = 0
    ENDIF
    iter = iter + 1
    z = z - iter
    bailout == 0
}

cnfrfnm1           { ; Copyright (c) Paul W. Carlson, 1998
  reset=1960 type=formula formulafile=cnfrfnc.frm
  formulaname=cnfrc_fnc_mset function=ident passes=t
  center-mag=-0.363636/0/0.6666667 params=2/0/1/0/2/125 float=y
  maxiter=300 inside=253 outside=summ
  colors=000zW0<93>d50d50d50d50d50d50<24>d50GGz<123>00O000<3>000
  }

cnfrfnm2           { ; Copyright (c) Paul W. Carlson, 1998
  reset=1960 type=formula formulafile=cnfrfnc.frm
  formulaname=cnfrc_fnc_mset function=tan passes=t
  center-mag=-0.31838046162856750/+0.00000000000000000/165.071\
  4/1/-90 params=0.3/0/1/0/2/125
  float=y maxiter=1000 inside=253 outside=summ
  colors=000zzz<123>OOOzVz<123>C0C000<3>000
  }

cnfrfnm3       { ; Copyright (c) Paul W. Carlson, 1998
  reset=1960 type=formula formulafile=cnfrfnc.frm
  formulaname=cnfrc_fnc_mset function=tan passes=t
  center-mag=-0.75447881955018380/+0.00000000000000001/28161\
  8.3/1/-90 params=0.8/0/1/0/2/125
  float=y maxiter=1000 inside=253 outside=summ
  colors=000zVz<123>C0Czzz<123>OOO000<3>000
  }

cnfrfnm4       { ; Copyright (c) Paul W. Carlson, 1998
  reset=1960 type=formula formulafile=cnfrfnc.frm
  formulaname=cnfrc_fnc_mset function=tan passes=t
  center-mag=-2.36993840473094200/+0.00000000000000000/29624\
  3.6/1/-90 params=2.1/0/1/0/2/125
  float=y maxiter=1000 inside=253 outside=summ
  colors=000zz0<123>aG00W2<123>080000<3>000
  }

cnfrfnm5       { ; Copyright (c) Paul W. Carlson, 1998
  reset=1960 type=formula formulafile=cnfrfnc.frm
  formulaname=cnfrc_fnc_mset function=tan passes=t
  center-mag=-2.23637362978152600/-0.00000000000000000/2.997\
  763e+009/1/-90 params=2/0/1/0/2/125
  float=y maxiter=1000 inside=253 outside=summ
  colors=000zW0<93>d50d50d50d50d50d50<24>d50GGz<123>00O000<3>000
  }

cnfrfnm6       { ; Copyright (c) Paul W. Carlson, 1998
  reset=1960 type=formula formulafile=cnfrfnc.frm
  formulaname=cnfrc_fnc_mset function=sqrt passes=t
  center-mag=-0.20224742875980910/+0.04306772560268265/2.13079\
  7e+008/1/-109.998
  params=1.4/0/1/0/2/125 float=y maxiter=1000 inside=253
  outside=summ colors=801sF_<123>C02Mov<123>HKS000<3>000
  }

cnfrfnm7       { ; Copyright (c) Paul W. Carlson, 1998
  reset=1960 type=formula formulafile=cnfrfnc.frm
  formulaname=cnfrc_fnc_mset function=ident passes=t
  center-mag=-2.30959242851517700/+0.00000000000000221/3.30018\
  2e+009/1/-90 params=2/0/1/0/2/125
  float=y maxiter=1000 inside=253 outside=summ
  colors=000zqa<123>WRFz88<123>O00000<3>000
  }

cnfrfnm8           { ; Copyright (c) Paul W. Carlson, 1998
  reset=1960 type=formula formulafile=mm.par
  formulaname=cnfrc_fnc_mset function=sin passes=t
  center-mag=-0.519429/5.20417e-018/98.03922/1/-90
  params=1.3/0/1/0/2/125
  float=y maxiter=300 inside=253 outside=summ
  colors=000zz0<123>aG0zzz<123>VVV000<3>000
  }



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Date: Tue, 10 Mar 1998 22:12:06 -0500
From: "Peter Gavin" <[e-mail]>
Subject: (fractint) Arb-prec (again :)  )

Umm..  I played around with that image from the par i sent a little bit ago,
and it seems to me like 17-digit precision is the magic number.  You won't
get the detail you want without this many, or more.  It seems to me that if
the # of digits is less than 17, all the images (i.e. the one at a spot for
15 digits, and the same spot at 14) are identical.  But, if you move from 16
to 17, you immediately notice the difference.  MUCH more detail, and no
solid blocks.  I find this somewhat odd; I've never had it happen before.
However, the params I used for the julia set were very very precise, with 20
or so digits.  (I zoomed in on an m-set and found a mini-brot, and used its
coordinates as the params.)  That may explain why, but I never tried
changing them...  a little change in the params can be a BIG deal :)

Pete
<[e-mail]>



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Date: Tue, 10 Mar 1998 19:14:47 -0800
From: "Jay Hill"<[e-mail]>
Subject: Re: (fractint) Carr3371

wizzle wrote
>How is this formula different than Bob's formula? Should I be keeping both
>and giving them different names? I have no idea about if....else. Can I
>overwrite Bob's formula and still produce his images?
I put both in the same file and renamed the old one with an appended
letter.
Then see if the images are the same with the new one.  If they are not,
then
the formula is not a replacement. If it is, then you can choose which you
like better, for speed, easy understanding, ...

And
>Perhaps what we need is "tutorial stone soup" which Noel might help out
>with by adding some links to the existing tutorial pages. Then the
>tutorially minded among us could simmer our hints and lessons pages and
>link to each other. The folks on the list would be benefited by being able
>to refer the befuddled to the tutorial links.  What do you think?

That is the nature of the web.  People will make links to the sites they
think
are helpful or interesting.  There are right now a few links which help
with
Fractint issues. They could be better 'linked' and when that happens, a few
will become good entry points for the questioner.  Right now, a long time
starting point for me is Spanky which I point to from my site.  Another
starting
point is the sci.fractals FAQ.

Any one heard from Dr. J and his Fractal of the Night stuff?  :-)
I've been way to busy with my night shift product testing to check up on
him.
From the looks of some messages I'm getting from fractal space, I think he
wants to get some new information out, but I just don't have time. Maybe
soon.  :-)

Cheers,
Jay
http://home.san.rr.com/jayrhill/



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Date: Tue, 10 Mar 1998 22:18:24 -0500
From: Les St Clair <[e-mail]>
Subject: Re: (fractint) documentation and Good machines

BJ wrote:

>> I ... compared the render time of some
>> pars made on my P166 at 1600x1200, to a 300mhz PII at 1024x768.  My P1=
66
was
>> just a little slower at a high res than the PII at a lower res. =


IK replied:

> The gain in floating-point speed between a P166 and a PII-300 is =

> more marginal than the megahertz-numbers would suggest, but there is a =

> gain... someone's going to post with clock timings and make me feel sil=
ly

> for making such a vague, unfounded statement... =


I tend to go along with IK's view that the clock speed alone should make
the PII's perform better.
Here's what I found with one of Brian's own pars -

> bejones3           { ; Contest image #3      t=3D00:18:18.07
>                      ; on a P166 at 1600x1200

On my PII-266 (under Win'95), I found
1600x1200, t=3D14m45s (24% faster)
1024x768, t=3D6m36s (192% faster)

hardly a startling improvement (considering that the clock speed is 60%
faster), but a bit quicker nontheless.

- - Les






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Date: Tue, 10 Mar 1998 22:21:20 -0500
From: "Peter Gavin" <[e-mail]>
Subject: Re: (fractint) Modified Continued Fraction Formula

It's kind of a cool idea, I guess, but doing the fraction in this manner can
be very slloowww...  :)  I'll show you a better way:

given:

            m
y =  -----------------
      n +     m
          -----------
           n +   m
               -----
                n + ...

you can replace m/(n+m/(n+....)) with y...  i.e.:

             m
y =   --------------
        n   +   y

then solve for y.
you'll get:

y(y + n) - m = 0
y^2 +ny - m = 0

and use quadratic formula...

    -n (+/-) sqrt(n^2 + 4m)
y = -----------------------
               2

This gives you the exact answer for y, without repeating the iteration of
m/(n+m/...).  Therefore, it's much faster.  I hope this helps :)

Pete



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Date: Tue, 10 Mar 1998 22:28:59 -0500
From: "Peter Gavin" <[e-mail]>
Subject: Re: (fractint) Modified Continued Fraction Formula

Oh, yeah...  I guess you would only use plus, not plus OR minus in the
quadratic formula... :)

Pete



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Date: Wed, 11 Mar 1998 00:05:50 EST
From: HWeber8606 <[e-mail]>
Subject: Re: (fractint) Text won't print

Hi Jay,

I visited yiur web-page and found your wonderful F.O.T.N. images, but I've
lost the adress of your site. Please post it for me.

Cheers --Jo--

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Date: Wed, 11 Mar 1998 00:07:36 EST
From: HWeber8606 <[e-mail]>
Subject: Re: (fractint) documentation

Hi Njan,

since some days my web-browser can't find your website - no file found!!
Please post the adress again. Thanks
Cheers --Jo--

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Date: Wed, 11 Mar 1998 00:17:42 -0500
From: "Brian E. Jones" <[e-mail]>
Subject: Re: (fractint) documentation and Good machines

Hi Les,

>>
I tend to go along with IK's view that the clock speed alone should make
the PII's perform better.
Here's what I found with one of Brian's own pars -
> bejones3           { ; Contest image #3      t=00:18:18.07
>                      ; on a P166 at 1600x1200
On my PII-266 (under Win'95), I found
1600x1200, t=14m45s (24% faster)
1024x768, t=6m36s (192% faster)
<<

Very interesting.

I ran the same par in Windows on my P233-MMX, here are the results:

1600x1200, t=12m40.71s
1024x768, t=5m37.17s

Compared to Les's, why is my 1600x1200 result faster than the 1024x768,
anyone?

Brian
- -
http://ourworld.compuserve.com/homepages/Brian_E_Jones
- -
[e-mail]
- -
[e-mail]



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Date: Wed, 11 Mar 1998 00:14:14 -0600 (CST)
From: [e-mail] (Paul and/or Joyce Carlson)
Subject: Re: (fractint) Modified Continued Fraction Formula

Pete,

>This gives you the exact answer for y, without repeating the iteration of
>m/(n+m/...).  Therefore, it's much faster.

Thanks - I appreciate the suggestion.  However, it can't be used to
reproduce the images created by my formula.  I wrote this formula as
an extension of my playing around with Taylor series of transcendental
functions.  And, just as log(z^2+1) + c does not produce an image with the
little "dimples" that make it interesting while the first few terms of the
Taylor series of log(z^2+1) + c does, the same is true with continued
fractions.  Using your exact solution produces entirely different
images that lack the small areas of discontinuity which contain
baby Mandelbrots in highly symmetrical (usually) settings.

Paul Carlson


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Date: Wed, 11 Mar 1998 05:56:34 -0500
From: George Martin <[e-mail]>
Subject: Re: (fractint) Carr3371

Angela,

>
How is this formula different than Bob's formula? Should I be keeping both
and giving them different names? I have no idea about if....else. Can I
overwrite Bob's formula and still produce his images?
<

Sorry for not explaining.

You can delete Bob's original formula and replace it with the if..else
version of the formula which I posted. The revised formula will draw the
exact same images as the original formula, only much faster.

The most recent version of Fractint introduced the use of explicit
conditional branching instructions in formulas, commonly referred to as the
if..else feature. Previously, conditional branching was achieved through a
very creative but time consuming series of formula instructions; Bob's
original Carr3371 is a good example of how this was done. Occasionally,
Sylvie or I will take a formula using the old method and rewrite it to take
advantage of the new feature. Before posting the revision, we will check to
make sure it is in fact drawing the same images as the original formula.
The revision will have the same name as the original, and is intended to
replace it.

George Martin


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End of fractint-digest V1 #129
******************************