Thanks for the list, Christian. Felix has set up an ICQ fractsl group at http://groups.icq.com/group.asp?no28214
It is amazing how many people across the world have a fractal mindset! I am still working on my original pars and frms. There are so many to look at and comment on that I am running out of HDD space real fast. Especially for the small laptop that I use.
Subject: (fractint) Split the list? Not this time!
Date: 20 May 1998 00:24:49 -0500
Tim Wegner wrote:
>
> Re the split the list proposal. Opinions on both sides were expressed, and I have decided for the time being to not split the list.
HOORAY!
<snip>
> I suggest we figure out some easy-to-remember string of three or
> four letters that could be put in the subjects of messages that > contain PARs or FRMs, but would be unlikely to otherwise be in the > subject.Then those who are interested could sort PARs into their own > mail folder. I don't know how well this would work because if you > unthinkingly reply to such a message, it would have the same string in > the subject. But on the other hand, it couldn't hurt.
>
> Any proposals for such a string?
On another list server I subscribe to, where there also is a heavy
volume of mail traffic, we use three- and four-letter strings similar to
what you have in mind, so that members can select which messages they
want to save in folders.
PAR: Three designs based on a Paul Carlson formula. In this example, PAR
is used once as an introduction and not in the Subject.
FRM: Three variations on gravijul. Again, a one-time use of a string.
MAP: Six metallic-looking palettes. Ditto on the string useage,
substituting palette for map in the subject.
HELP: Please explain periodicity. For those who don't want to read the
fractint.doc.
DISC: Is it necessary to port Fractint to Windows? DISC=discussion.
HARD: Fractint doesn't work with my video card. For hardware-related
problems.
MISC: For other on-topic matters that don't fall into the above
categories. Art shows, making posters and T-shirts using fractal images,
suggestions for further Fractint improvement (as if it needed any), etc.
Just my two meticais worth. (Meticais: Plural of metical, a unit of
currency in Mozambique.)
Bob
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From: Harry Rich <HRich@adamhs.co.Montgomery.OH.US>
Subject: Re: (fractint) Bug in formula parser ? (v. 19.6)
Date: 22 May 1998 16:51:05 +0100
I'm guessing because I don't understand the formula processing (I just like to look at the pretty pictures), but if "z=0" sets the intial value of z and the expression "z*z*z*z/(z*z+p1)" computes the next value of z, then for p1= 0 the 2nd iteration is indeterminate (0/0) for all values of c. My guess is that Fractint traps the zero divide and discards the point from the M-set. Many expressions converge to unattainable limits.
>>> Oliver Klimek <klimek@bgb.mannheim-netz.de> Tue 19May98 4:36P >>>
During my experiments om mutating M-sets by strategically placing
additional parameters inside the formula I have noticed a bug/feature of
the formula parser. It might have been already noticed by somebody else
but I just want to make sure the developers know about it. The following
formula:
okM_01{ z=0
c=pixel:
z=z*z*z*z/(z*z+p1)+c
|z|<=8
}
converges to the standard Mandelbrot with p1 approaching 0. When p1 is set
to any non-zero value, everything works as it should. But when p1 is set
to 0 all of a sudden the M-set disappears completely. This also happens
when the formula is rewritten using sqr() or z^n notation. Try writing the
Mandel formula as z = z^4 / z^2. It won't work. Of course there is a
singlularity at (0,0), but the rest of the formula should just work out
fine.
Who has an answer ?
Oliver
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