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fractint Digest        Friday, October 10 1997        Volume 01 : Number 027



In this issue:

    Re: (fractint) IFS Formulas
    (fractint) Removing integer math from Fractint? Wait a minute....
    (fractint) dmj-pub.frm
    (fractint) Why?
    Re: (fractint) IFS Formulas
    (fractint) potpourii
    Re: (fractint) Re:
    (fractint) Integer v. float
    Re: (fractint) IFS Formulas
    Re: (fractint) IFS Formulas
    Re: (fractint) Integer v. float
    (fractint) today's fractal fortune
    Re: (fractint) potpourii
    (fractint) Books
    Re: (fractint) Re:
    Re: (fractint) potpourii
    (fractint) Friday(monday)
    Re: (fractint) Why?
    (fractint) XFRACT and making it work
    Re: (fractint) Integer v. float
    Re: (fractint) dmj-pub.frm
    Re: (fractint) IFS Formulas
    (fractint) Remove Int math ?
    Re: (fractint) Books

See the end of the digest for information on subscribing to the fractint
or fractint-digest mailing lists and on how to retrieve back issues.

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

Date: 09 Oct 97 15:17:16 GMT
From: [e-mail] (Wim de Lange)
Subject: Re: (fractint) IFS Formulas

Op  8 Oct 97 om 12:48 schreef [e-mail] over:
"(fractint) IFS Formulas"

> Here is an example of a small utility (20k zipped) that I write for
> fractint 19.6, for inverting the ifs attractors defined in the

Very nice effects? Does the number of iterations play a role in it?

> than 9 transformations, the program writes the formula and its

Why 9?

> comment will be greatly appreciated..

As I did.

> ps. sorry for the bad english..

That I don't see. My native language is Dutch.

> --------------------------------------------------------------------

Some questions about the par.

> f2J    { ; t=4
>  type=formula formulafile=ifs.frm formulaname=f2_J
>  params=10000/0/0.004/2.375 float=y corners=-8/8/-1/11
> }


What = t? Params = ??/??/?? What are these numbers in plain English?
No MaxIter in the par file. Does this parameter plays a role in
generating a nice image? What is in your opinion a good color file?
I'm not good in generating good colorpalette's.

Groetjes,
    Wim de Lange
 _____________________________________

 Internet:    [e-mail]
 CompuServe:  100142,604
 _____________________________________


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

Date: Thu, 09 Oct 1997 16:55:34 +0200
From: Burger <[e-mail]>
Subject: (fractint) Removing integer math from Fractint? Wait a minute....

***this is a repost. third attempt, actually. havent got a clue what the
problem is. my adress seems to be allright***

On the subject of  removing integer code from Fractint, Tim Wegner wrote:

> There are only two arguments I can think of against this.
>
> 1. There are still millions of older machines around the world
> without FPUs. The most recent use the 486SX chips.
>
> (I think that is a weak argument as time goes by.)
>
> 2. Artists have a huge number of images that depend on artifacts of
> integer math.
>
> There's no good answer to this except "keep your old copy of
> Fractint".
>

Unless I have missed something, until now I haven't heard much comment on
the second argument. One of my favorite images features this so called
artifact. I have stored it in the first of the two parameterfile-entries
that follow. I have stored the same image with option float=yes in the
second entry. As you can see, float=yes or float=no makes quite a
difference.
(please read on after this parameter section)
- -------8<------------------------------------
floatno            { ; (c) 1997 [e-mail]
  reset=1730 type=formula formulafile=fractint.frm
  formulaname=richard1 passes=1 float=n
  corners=-0.81683618/-0.55938143/0.797761261/0.68775022/-0.67134571/0.603\
  740633 maxiter=900 inside=0 logmap=yes potential=255/350/500
  colors=222C6E<44>KRILSJMTI<14>FCBEAAEBA<12>MRLNSMOUNPVORWQ<12>lmknomnnl<\
  29>R3C<14>LJFKLGLMH<13>ecYge_ge_<13>gdVhcUgbT<13>JBFH9DHAD<13>TQQUSRVSR<\
  13>nURpVSpVS<13>e_Sd`Td`TdaT<10>ahUC5EC5EC5E
  }

floatyes           { ; (c) 1997 [e-mail]
  reset=1730 type=formula formulafile=fractint.frm
  formulaname=richard1 passes=1
  corners=-0.81683842/-0.55938598/0.797753176/0.687746147/-0.67134795/0.60\
  3736559 float=y maxiter=900 inside=0 logmap=yes
  potential=255/350/500
  colors=222C6E<42>KQIKRIKRILSJMTIMSI<13>FCBEAAEBA<11>LQKMRLNSMOUNPVO<13>l\
  mknomnnl<29>R3C<12>MHFLIFLJFKLGLMHNNI<10>b`WdbXecYge_ge_<13>gdVhcUgbT<13\
  >JBFH9DHAD<13>TQQUSRVSR<13>nURpVSpVS<13>e_Sd`Td`TdaT<10>ahUC5EC5EC5E
  }
- ---------8<------------------------------------
Now I really don't mean to urge the developers of Fractint to keep integer
math, join the Integerology Church and set fire to all PC's with 32-bit
software (the old XT's and AT's with their 5'25 floppy drives probably burn
better anyway).

I think that if removing integer math stimulates the development of
Fractint, then please do so! Just to compare, think about the development
of wordprocessors. Some of you might remember Wordstar, a wordprocessor of
the 80's, or the early versions of WordPerfect . Compare this to recent
Window-versions of MS-Word or WordPerfect for Windows and it's like
comparing the Mayflower to the Spaceshuttle. And the Spaceshuttle doesn't
have sails, does it? So if it is possible to do the same kind of
development with Fractint, and if this involves removing the sails of
integer math, then I guess it should be done. Fractint is a wonderful
program as it is, but there are so many wonderful new ideas to implement.

BUT what about my poor fractals that have that integer-artifact?? With all
respect, there is something about Tim's suggestion I don't like (keeping an
old version of Fractint available for yourself in case you want to
regenerate one of  those silly old images). For example, in a future
release there may be a coloring option that I want to apply on a image that
has the integer-artifact. If the integer-math would have been removed, that
wouldn't be possible.

So here is my suggestion, at the risk of making a fool of myself because I
don't know xxx about integer- and floating-point math, not to mention
32-bit software development. If somebody can find out what exactly causes
the integer-artifact effect, would it be possible to simulate this effect
in floating-point math and introduce this as (let's say) an outside=intmath
option?

Now, wouldn't that be a challenge for the real programmer!!?? This morning
in the TV-news I saw a robot dancing the mambo, so if programmers can do
that, then I am sure that for you guys simulating the effect of
integer-math by using floating point math is a piece of cake....:-D

adios, do widzenia, houdoe, bye!
Jacco

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

Date: Thu, 9 Oct 1997 17:22:31 -0400
From: Les St Clair <[e-mail]>
Subject: (fractint) dmj-pub.frm

Hi Damien,

>>Just wanted to let everyone know that an update version of my FRM for n=
ew
coloring methods has been placed on my web site.<<

Good grief!! How long did it take for you to work that little lot out?

>>I have also included a PAR file that makes getting started with these
formulae easier.<<

Your examples are absolutely stunning. =


Thanks for sharing your work.

cheers, Les St Clair



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

Date: Thu, 9 Oct 1997 19:40:49 -0500
From: [e-mail]
Subject: (fractint) Why?

I have a question (again) :|>
Why do you use, mess with, manipulate, study, or whatever with fractals
and fractint?
Personally, I find them to be uncannily (real word?) natural.
And lately I've been reviving my math to use it to write some rudimentary
farctals of my own.
 But what about you people out there in Mandel land?


"...God is in the details..." Linus C. Pauling

Nuke

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

Date: Thu, 9 Oct 1997 19:44:37 +0500 (GMT)
From: Ramiro Perez <[e-mail]>
Subject: Re: (fractint) IFS Formulas

On 9 Oct 1997, Wim de Lange wrote:

> "(fractint) IFS Formulas"
>
> > Here is an example of a small utility (20k zipped) that I write for
> > fractint 19.6, for inverting the ifs attractors defined in the
>
> Very nice effects? Does the number of iterations play a role in it?

Yes, because since they are inverse to the ifs attractors, sometimes you
need more than 150 iterations to get a good image..

> > than 9 transformations, the program writes the formula and its
>
> Why 9?

In fact 8, because more IFS transformations, larger the formula
definition, and I think that fractint don't support definitions that
where too large (by the way, can anyone say to me what is the limit?)..

> Some questions about the par.
>
> What = t? Params = ??/??/?? What are these numbers in plain English?
> No MaxIter in the par file. Does this parameter plays a role in
> generating a nice image? What is in your opinion a good color file?
> I'm not good in generating good colorpalette's.

Ok, there is no maxiter nor a color definition because I prefer to leave
it to the control of the user..
In the case of the t=4; that means the number of
transformations, for example the Fern has 4. In the case of the Params,
the first number is the bailout number,next one, nothing, and the last two
are the julia-like constant for those fractals, (Yes, they are julia
sets..). A better explanation is in the readme.txt that is with the
program...

For the colors, I noticed that these fractals needs color maps with small
gradations, because in most of them the orbit tends to escape very fast..
That is why I use a bailout so large (10000!)

After some manipulations to the fractals produced by my program, you can
end with something interesting, for example:

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

fernJ{ ; t=4
  reset=1960 type=formula formulafile=fern.par formulaname=fern_J
  passes=1 corners=-8/8/-1/11 params=10000/0/0.32/7.15 float=y
  maxiter=255 inside=255 colors=000<16>000010030<37>0x00z00z0<195>zzz
  }

frm:fern_J{
a0=0.01000,d0=0.16000,
a1=0.85000,b1=0.04000,c1=-0.04000,d1=0.85000,
a2=0.20000,b2=-0.26000,c2=0.23000,d2=0.22000,
a3=-0.15000,b3=0.28000,c3=0.26000,d3=0.24000,
al0=0.00160,
al1=0.72410,k1=0.06400,l1=-1.36000,
al2=0.10380,k2=-0.41600,l2=-0.32000,
al3=-0.10880,k3=0.12320,l3=0.06600,
z=pixel:
x=real(z)
y=imag(z)
o0=(d0*x)/al0+flip((a0*y)/al0)
op0=|o0-p2|
o1=(d1*x-b1*y+k1)/al1+flip((-c1*x+a1*y+l1)/al1)
op1=|o1-p2|
o2=(d2*x-b2*y+k2)/al2+flip((-c2*x+a2*y+l2)/al2)
op2=|o2-p2|
o3=(d3*x-b3*y+k3)/al3+flip((-c3*x+a3*y+l3)/al3)
op3=|o3-p2|
IF (op0<op1 && op0<op2 && op0<op3)
z=o0
ELSEIF (op1<op0 && op1<op2 && op1<op3)
z=o1
ELSEIF (op2<op1 && op2<op0 && op2<op3)
z=o2
ELSEIF (op3<op0 && op3<op1 && op3<op2)
z=o3
ENDIF
|z|<=p1
}

frm:stretch_J{
a0=0.51515,b0=-0.71970,c0=-0.69697,d0=-0.39394,
a1=0.39394,b1=0.16288,c1=0.42424,d1=-0.27652,
al0=-0.70455,k0=-2.56002,l0=-5.58475,
al1=-0.17803,k1=-0.26541,l1=-4.59526,
z=pixel:
x=real(z)
y=imag(z)
o0=(d0*x-b0*y+k0)/al0+flip((-c0*x+a0*y+l0)/al0)
op0=|o0-p2|
o1=(d1*x-b1*y+k1)/al1+flip((-c1*x+a1*y+l1)/al1)
op1=|o1-p2|
IF (op0<=op1)
z=o0
ELSE
z=o1
ENDIF
|z|<=p1
}


stretchJ           { ; t=2
  reset=1960 type=formula formulafile=fern.par formulaname=stretch_J
  corners=-8/8/-1/11 params=10000/0/-0.08500000000000001/5.024 float=y
  colors=000000<29>00k00m01m<29>0ky0mz1mz<30>zzz<46>2zz0zz0yz<45>02z00z00y\
  <59>002000000
  }

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


     Suerte!

           Ramiro Perez <[e-mail]>






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

Date: Thu, 09 Oct 1997 19:42:56 -0500
From: "Justin A. Kolodziej" <[e-mail]>
Subject: (fractint) potpourii

Just a few comments on a few subjects, mostly because I feel too lazy to
reply to the different threads ;):

1.  Maybe there is a place for integer math in Fractint.  It certainly
has its supporters, as you all can see.  I hereby amend my wish list
post to read as follows:  Instead of "no more integer math," how about
"floating point math as default?"  This would satisfy the
traditionalists, while the rest of us who prefer float = yes get it
automatically!  I know you can edit the SSTOOLS.INI file to get it
automatically, but I said I was lazy, remember?

2. Where do I get DJGPP??????

3.  What's with the quat orbit in the julibrot type?  When I try to run
it from, let's say, cj=-1 to cj=1, I get a sphere! This can't be right
because when I check the regular quat type between those two extremes,
the results certainly are NOT circles!  What's going on here?  Is it my
fault or Fractint's?

4.  Try this: it's a generalized Nuke1:
SuperNuker {;Justin Kolodziej
;mod. of Mr. Newstead's Nuke1
z = 0
c = pixel
d = fn2(pixel):
 z = (fn1(z)+c)/d
}

Justin Kolodziej

"I only use Windows because:
1. Solaris doesn't run on PCs :(
2. I can't afford an Ultra SparcStation 3 :( :*( :-(
3.  When's the last time YOU saw an X-Windows app in your local software
store?! ;)"




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

Date: Thu, 09 Oct 1997 22:30:06 -0700
From: Peter Jakubowicz <[e-mail]>
Subject: Re: (fractint) Re:

> Very simple!
Thanks kindly, Linda. It works, of course.
I may try to post some formulas soon, but can anyone tell me if there
is some index of .frm files somewhere, so I can check to see if I am
merely reinventing someone else's?

Also, I am considering plunking down $50 at my local bookstore for a
copy of The Science of Fractal Images, which I think I have seen
referred to here a few times. Is this a good book? I am trying to learn
more, more, more of the technical stuff and am looking for lots of math
formulas to play with. Perhaps something has been written since that is
better? Any help wld be appreciated.

                    Peter
>
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------------------------------

Date: Fri, 10 Oct 1997 00:46:47 -0400 (EDT)
From: Evin C Robertson <[e-mail]>
Subject: (fractint) Integer v. float

Well, I say keep the integer math.  Despite what some people have said,
integer math is, in general, faster than floating point, with a few
exceptions.  On the regular pentium and pentium MMX, floating point
multiplication is faster than integer multiplication.  On everything
else (P-pro, PII, K6, each better than the regular pentium and pentium
MMX), integer multiplication is faster than floating point.  The problem
Fractint has now with integer math is that it's running in 16-bit mode,
so every 32 bit operation requires prefixes which can slow things down.
Just porting fractint to 32 bits and keeping the integer math would
speed it up.  DJGPP and NASM, please...


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

Date: 10 Oct 97 08:08:27 GMT
From: [e-mail] (Wim de Lange)
Subject: Re: (fractint) IFS Formulas

Op  9 Oct 97 om 19:44 schreef [e-mail] over: "Re:
(fractint) IFS Formulas"

> Yes, because since they are inverse to the ifs attractors, sometimes
> you need more than 150 iterations to get a good image..

Ah, in that case I' m going to edit the par file the program
generates. I'm using PARTOBAT for automatically generating the
pictures.

> In fact 8, because more IFS transformations, larger the formula
> definition, and I think that fractint don't support definitions that
> where too large (by the way, can anyone say to me what is the
> limit?)..

So if this limit is higher than you expect, you are gonna to rewrite
the program :-)

> Ok, there is no maxiter nor a color definition because I prefer to
> leave it to the control of the user.. In the case of the t=4; that

Ok. that means I must do the work myself ;-) Oh well, that is the fun
to fractint. Isn't it?

> means the number of transformations, for example the Fern has 4. In

I thought so, but  I was not sure.

> For the colors, I noticed that these fractals needs color maps with
> small gradations, because in most of them the orbit tends to escape
> very fast.. That is why I use a bailout so large (10000!)

I get it. I've read the readme file now (I don't normally do that
:-). And much is clearer now.

Groetjes,
    Wim de Lange
 _____________________________________

 Internet:    [e-mail]
 CompuServe:  100142,604
 _____________________________________


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

Date: Fri, 10 Oct 1997 07:44:16 -0400
From: George Martin <[e-mail]>
Subject: Re: (fractint) IFS Formulas

Ramiro Perez wrote:

>
In fact 8, because more IFS transformations, larger the formula
definition, and I think that fractint don't support definitions that
where too large (by the way, can anyone say to me what is the limit?)..
<

Right now, a formula's text is limited to 8192 characters (not including
white space and comments), and by the memory available to store the various
functions and pointers to actually run the formula. The amount of memory
used by a formula can be seen in the CTRL-TAB screen (while the image is
drawing, hit TAB, and then CTRL-TAB for lots of information about what is
going on inside fractint at the time).

One of the projects for the next version of fractint is to make more
efficient use of memory in the formula parser, which should result in much
larger formulas being possible.

George Martin

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

Date: Fri, 10 Oct 1997 07:49:35 -0400 (EDT)
From: [e-mail] (Ian J Kaplan)
Subject: Re: (fractint) Integer v. float

Evin C Robertson wrote:
>
> Well, I say keep the integer math.  Despite what some people have said,
> integer math is, in general, faster than floating point, with a few
> exceptions.  On the regular pentium and pentium MMX, floating point
> multiplication is faster than integer multiplication.  On everything
> else (P-pro, PII, K6, each better than the regular pentium and pentium
> MMX), integer multiplication is faster than floating point.  The problem

[snip]

   The question is, how big a speed difference are we talking about?
because the advantages of moving to floating point code, in terms of
shrinking the code and getting into a compile-anywhere situation, are
considerable... Actually, we can measure this, can't we? Would people
with non-pentium chips of all kinds care to submit some sample times with
float=no and float=yes?


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

Date: Fri, 10 Oct 1997 09:39:55 -0300 (ADT)
From: Michael C Taylor <[e-mail]>
Subject: (fractint) today's fractal fortune

No plain fanfold paper could hold that fractal Puff --
He grew so fast no plotting pack could shrink him far enough.
Compiles and simulations grew so quickly tame
And swapped out all their data space when Puff pushed his stack frame.
        (refrain)
Puff, he grew so quickly, while others moved like snails
And mini-Puffs would perch themselves on his gigantic tail.
All the student hackers loved that fractal Puff
But DCS did not like Puff, and finally said, "Enough!"
        (refrain)
Puff used more resources than DCS could spare.
The operator killed Puff's job -- he didn't seem to care.
A gloom fell on the hackers; it seemed to be the end,
But Puff trapped the exception, and grew from naught again!
        (refrain)
Refrain:
        Puff the fractal dragon was written in C,
        And frolicked while processes switched in mainframe memory.
        Puff the fractal dragon was written in C,
        And frolicked while processes switched in mainframe memory.

- --
Michael C. Taylor <[e-mail]> <http://www.mta.ca/~mctaylor/>
 Programmer, Computing Services, Mount Allison University, Canada
 sci.fractals FAQ <http://www.mta.ca/~mctaylor/sci.fractals-faq/>
    fractal and cryptography archive <http://fractal.mta.ca/>


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Date: Fri, 10 Oct 1997 07:58:34 -0500
From: [e-mail] (Merle L Newsted Jr)
Subject: Re: (fractint) potpourii

> Where do I get DJGPP??????

Yeah! Where do I get DJGPP? And what hte heck does it stand for???

>3.  What's with the quat orbit in the julibrot type?  When I try to
>run
>it from, let's say, cj=-1 to cj=1, I get a sphere! This can't be right
>because when I check the regular quat type between those two extremes,
>the results certainly are NOT circles!  What's going on here?  Is it
>my
>fault or Fractint's?

Hunh?
>4.  Try this: it's a generalized Nuke1:
>SuperNuker {;Justin Kolodziej
>;mod. of Mr. Newstead's Nuke1
>z = 0
>c = pixel
>d = fn2(pixel):
> z = (fn1(z)+c)/d
>}

Thanks!, I just discovered the fn1 option the other day, It's the sort of
thing I've been looking for so I can write a general form and play with
it.(Remember I'm a beginner (:{()

P.S. My name has no "A" in it. it's Newsted. Am I picky or what?

Thanks again,
Merel L. Newsted Jr. (Nuke)
>Justin Kolodziej
>
>"I only use Windows because:
>1. Solaris doesn't run on PCs :(
>2. I can't afford an Ultra SparcStation 3 :( :*( :-(
>3.  When's the last time YOU saw an X-Windows app in your local
>software
>store?! ;)"
>
>
>
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Date: Fri, 10 Oct 1997 07:58:23 -0500
From: [e-mail] (Merle L Newsted Jr)
Subject: (fractint) Books

Peter,
Have you seen Mandelbrot's "The fractal geometry of Nature" ? (or
somethinglike that) I thinks it's out of print, but you might be
supprised what you can find at a used bookstore.

Nuke

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Date: Fri, 10 Oct 1997 10:05:51 -0300 (ADT)
From: Michael C Taylor <[e-mail]>
Subject: Re: (fractint) Re:

On Thu, 9 Oct 1997, Peter Jakubowicz wrote:

> copy of The Science of Fractal Images, which I think I have seen
> referred to here a few times. Is this a good book? I am trying to learn
> more, more, more of the technical stuff and am looking for lots of math

The Science of Fractal Images is a "technical coffee table" book. Great
for us mathematical types to leave lying around our houses, so guests can
say, "I cannot belief that little equation generates That!" It is a very
nice book, I picked up a copy and was quite impressed with it.

Depends on what sort of mathematical knowledge you seek, if you want to
begin at the beginning, it isn't the right place. G.A. Edgar's _Measure,
Topology, and Fractal Geometry" or Barnsley's _Fractals Everywhere_. Both
are aimed at the 3-5 year Physics, Math, CS, or Engineering undergrad
student. If you don't fit in that category, Devaney's _Chaos, Fractals,
and Dynamics_ might be a better place to start.

- --
Michael C. Taylor <[e-mail]> <http://www.mta.ca/~mctaylor/>
 Programmer, Computing Services, Mount Allison University, Canada
 sci.fractals FAQ <http://www.mta.ca/~mctaylor/sci.fractals-faq/>
    fractal and cryptography archive <http://fractal.mta.ca/>


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Date: Fri, 10 Oct 1997 10:15:07 -0300 (ADT)
From: Michael C Taylor <[e-mail]>
Subject: Re: (fractint) potpourii

On Fri, 10 Oct 1997, Merle L Newsted Jr wrote:

> > Where do I get DJGPP??????
>
> Yeah! Where do I get DJGPP? And what hte heck does it stand for???

DJGPP is a port of the GNU C/C++ gcc compiler to DOS.
It was ported by DJ, and you cannot have ++ in a DOS name, hence DJGPP.

DJGPP is freely available from http://www.delorie.com/ for documents and
pointers to the actual files. It is intended primaryly for experienced
(UNIX) programmers, not necessary for the faint of heart.

It is not fractal software! (I'll save your several MBs of downloading...)

- --
Michael C. Taylor <[e-mail]> <http://www.mta.ca/~mctaylor/>
 Programmer, Computing Services, Mount Allison University, Canada
 sci.fractals FAQ <http://www.mta.ca/~mctaylor/sci.fractals-faq/>
    fractal and cryptography archive <http://fractal.mta.ca/>


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Date: Fri, 10 Oct 1997 09:02:39 -0500
From: [e-mail] (Merle L Newsted Jr)
Subject: (fractint) Friday(monday)

Ever have one of those days when you correct someone's misspelling of
your last name , AND THEN you misspell your own FIRST name in the
message?!
I'm MERLE not MEREL, and a big dunce too!

signed, and spell checked,
MERLE L. NEWSTED JR. (Nuke)


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Date: Fri, 10 Oct 1997 08:38:30 -0600 (MDT)
From: Jason Hine <[e-mail]>
Subject: Re: (fractint) Why?

Nuke,

Why not?.... ;)

    I suppose everyone has different reasons for being interested in
fractals; perhaps some of us are in it for the artistic qualities they have,
others for the bizarre (and therefor often 'natural') mathematical correlations
that can be found in them, and still others (I'm in this flow) percieve
analogies between fractal concepts and long-held beliefs in subjects like
science and religion.

    Certainly we are all fascinated by fractals, and this fascination urges
us to find applications and relevancies between fractals and our world.  If you
browse through some of the recent issues of _Science_, you can find examples of
applied fractal theory, and even recognize fractal concepts hidden in articles
where the author might not have even heard of fractals!  Another reason some of
us are into these things is that it is a fairly new field, and there is much
room for discovery... it's easier to be on the 'cutting edge' of fractology (?!)
than it is to be on the cutting edge of, say, molecular biology.

Hope I haven't spoken too much for anyone/everyone else; I'd be interested in
reading other folk's answers to Nuke's question.

Spidey

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Date: Fri, 10 Oct 97 15:51:23 BST
From: [e-mail]
Subject: (fractint) XFRACT and making it work

Recently I posted about having trouble making xfract work. This has now
been fixed. It was necessary to add
- -DBIG_ANSI_C to the $(DEFINES) in the makefile
I don't know if this was because the Makefile was broken, or because the uni's
unix was duffed up. Any case, adding that fixed it.
I am runing Solaris, and am using the latest XFRACT from the fractint webpages
(version 3.04?)

Hope this helps at someone other than me,

Hoppy

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Date: Fri, 10 Oct 1997 11:05:43 -0400
From: [e-mail] (Grasso, Nick)
Subject: Re: (fractint) Integer v. float

>   The question is, how big a speed difference are we talking about?
>because the advantages of moving to floating point code, in terms of
>shrinking the code and getting into a compile-anywhere situation, are
>considerable... Actually, we can measure this, can't we? Would people
>with non-pentium chips of all kinds care to submit some sample times with
>float=no and float=yes?

In regard to the float vs. integer discussion, I would like to see the
integer code removed from fractint and have it ported to DJGPP. Although I
don't have any benchmarks, on my old 486-33 there was no significant
difference in speed between float and integer. I think the best arguement
for keeping integer is that many artists rely on integer artifacts.
However, as Tim has said, they can always keep an older version around.
Also, wasn't there an attempt at duplicating these integer artifacts in the
formula parser? Isn't this what floor and ceil are supposed to do? How well
does this work?

Nick
[e-mail]


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Date: Thu, 09 Oct 1997 23:54:43 -0400
From: "Damien M. Jones" <[e-mail]>
Subject: Re: (fractint) dmj-pub.frm

Les,

 - Good grief!! How long did it take for you to work that little lot out?

Actually, not that long.  A lot of it is cut-and-paste, else I never would
have managed to write 100 fully-commented formulae. :)  You'll notice the
PAR file is far less commented.

Damien M. Jones  /  temporary sanity designs  /  http://www.emi.net/~dmj/
   [e-mail]  /  my gallery: http://www.geocities.com/SoHo/Lofts/2605/


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Date: Fri, 10 Oct 1997 08:47:05 -0400
From: [e-mail]
Subject: Re: (fractint) IFS Formulas

It's nice to see some IFS discussion going on. I'd like to let you know of
another IFS 'utility' for fractint that I've been working on. It's a
Windows screensaver that has the ability to create text for a fractint par
file based on its current IFS image. I recently added a 'mutate' ability
that lets the viewer see what happens as the transformation set changes.

If you run on a Windows system and you're interested, take a look at
http://www.geocities.com/SoHo/Studios/1450 where you can download the saver
and a set of par formlulae for some interesting images it generated.

Because of the coloring scheme I use to translate the saver images to
fractint, you'll find that the minimum number of transforms is 12 :'(

Bill Decker

>Hello
>
>Here is an example of a small utility (20k zipped) that I write for
>fractint 19.6, for inverting the ifs attractors defined in the fractint
>ifs files, and rewritting it for fractint formula types and for fractint
>par files. It takes a fractint ifs file, scan it, then if there is an ifs
>definition, and if it isn't 3D ifs and has less than 9 transformations,
>the program writes the formula and its correspondient par file..
>The program is in my web pages, in the gallery section, but if you wish to
>go directly, here is the address:
>http://www.utp.ac.pa/~rperez/ifsinv.html
>By the way, this program is a new release of an old one that I have for
>the same work, but this one if far more simpler and this time the program
>optimizes the formulas, so it runs faster than the old one..
>Any comment will be greatly appreciated..
>
>
>                        Ramiro Perez
>



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Date: Fri, 10 Oct 1997 14:00:54 -0400
From: Sylvie Gallet <[e-mail]>
Subject: (fractint) Remove Int math ?

Hi Thierry,

>> And I'm working on a long term project with this formula :
>>
>> -----------------------------------------------------------
>>  frm:rand_generic {  ; ****   PARAMETER 1 MUST BE > 0   ****
>>                ; Thierry Boudet 101355.2112ompuserve.com
>>                ; 19 Juillet 1997
>>                z =3D rand:
>>                z =3D fn1(z) + fn2(pixel);
>>                |z| <=3D real(p1)
>>                }
>> -----------------------------------------------------------
>>
>> who works very fine (for me :-) in integer mode, but is completly
>> broken in float mode...

  The following formula works with float=3Dyes:

frm:rand_generic {  ; ****   PARAMETER 1 MUST BE > 0   ****
                ; Thierry Boudet 101355.2112ompuserve.com
                ; 19 Juillet 1997
                z =3D srand(z):
                z =3D fn1(z) + fn2(pixel);
                |z| <=3D real(p1)
                }

  Cheers,

        - Sylvie

- ----------------------------------------------------------------------
  [e-mail]
  http://spanky.triumf.ca/www/fractint/sylvie/gallet.html
  http://ourworld.compuserve.com/homepages/Sylvie_Gallet/homepage.htm
- ----------------------------------------------------------------------


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Date: Fri, 10 Oct 1997 19:10:55 -0700
From: "Felix (Jason) Bunke" <[e-mail]>
Subject: Re: (fractint) Books

Merle L Newsted Jr wrote:
>
> Peter,
> Have you seen Mandelbrot's "The fractal geometry of Nature" ? (or
> somethinglike that) I thinks it's out of print, but you might be
> supprised what you can find at a used bookstore.
>
> Nuke
>
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Yes, it is still available.  www.amazon.com has it for only $28.  I've
ordered from them before, and i would wholeheartedly recommend their
services.  It's always interesting to go back to the source and learn
directly from "Big Poppa" Mandelbrot!

By the way, this is my first posting.  I'm a new graduate student at the
mathematics dept. of the Georgia Institute of Technology, and you guys
have definitely kept my new account very busy!

For a very thorough, rigorous and technical book on the mathematical
theory behind fractal geometry, Kenneth Falconer's book "Fractal
Geometry: Mathematical Foundations and Applications"  is probably the
most complete and best-written book of that sort that I have found so
far.

By the way, I'm looking at possibly concentrating in dynamical systems,
fractals and the like during my studies, which is what led me to Georgia
Tech -- the home of the Center for Dynamical Systems and Nonlinear
Studies and the former stomping grounds of Michael Barnsley, whose book
"Fractals Everywhere" is actually used in a course I may try to take
next quarter.

Happy bookhunting!  Plus, I agree with the comment on used bookstores --
I've found some real gems at those places!

- -- Felix Bunke ([e-mail])

(Sorry, I haven't learned yet how to put links in my e-mail -- I haven't
had it for very long!)

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