Title: Complex powers Post by: Kali on January 18, 2011, 03:34:35 PM I don't know how complex powers are calculated, but this are some formulas I've tried in UF5 with interesting results.
z = c ^ z * @m z = c ^ z * @m + c z = 1 / c ^ z * @m + 1 / c (bailout above 1000) Note: '@m' is a multiply factor entered as a parameter to modify the drawing, for example 1, 0.9, -0.7... z = z ^ (0,2) + c z = z ^ (0,-2) + c (bailout above 10000) They don't generate something as wonderful and with the great diversity of the original mandelbrot, but it's worth seeing, the images are very non-conventional fractals. A few samples... I don't remember the exact formulas for each one, but they derivates from the above: (http://sphotos.ak.fbcdn.net/hphotos-ak-snc6/hs075.snc6/168593_1715661861223_1528504553_1740104_6686896_n.jpg) (http://sphotos.ak.fbcdn.net/hphotos-ak-snc6/hs034.snc6/166453_1715662421237_1528504553_1740106_2777118_n.jpg) (http://sphotos.ak.fbcdn.net/hphotos-ak-snc6/hs058.snc6/168867_1710042280737_1528504553_1729704_6002606_n.jpg) Pretty strange patterns, don't you think? Title: Re: Complex powers Post by: Fractal Ken on January 18, 2011, 05:13:41 PM Kali, those pictures are very interesting, and I think I've done similar things, but I have a question about the notation everyone here seems to use.
What is the meaning of c? Is it a constant across all pixels, or does it vary by pixel? In other words, If I write z = z^2 + c, am I describing the Mandelbrot set or a Julia set? Ken Title: Re: Complex powers Post by: Kali on January 18, 2011, 05:27:24 PM I was talking about varying c by pixel like the M-Set, but I also tried the formulas like Julia sets with some good results.
Title: Re: Complex powers Post by: Fractal Ken on January 18, 2011, 06:33:48 PM Thanks for the clarification!
Title: Re: Complex powers Post by: cKleinhuis on January 18, 2011, 07:13:35 PM @ken, you describe a formula, if initial values come along you have the julia/mandelbrot distinguation
alone it can not be distinguished, usually people mean the mandelbrot method ( varying per pixel ) and the julia method is implied ( constant per pixel ) regards Title: Re: Complex powers Post by: Fractal Ken on January 18, 2011, 08:19:45 PM Thanks, Christian.
Here are two simple Julia-type examples using complex exponents, colored with escape time. (http://i1122.photobucket.com/albums/l540/Fractal_Ken/ComplexExponent1.png) z = z^(0, 2) + (1.08, -0.50); Iterations = 75; Bailout = 10; The red is the non-escape region (http://i1122.photobucket.com/albums/l540/Fractal_Ken/ComplexExponent2.png) z = z^(0, -2) + (0, 0); Iterations = 1000; Bailout = 100 Title: Re: Complex powers Post by: Kali on January 18, 2011, 08:54:32 PM Nice! Here's another:
(http://img52.imageshack.us/img52/7016/juliacomplexpow.jpg) z=z^(0,2)+(0.2330725,0.228134) - Iterations:100 - Bailout: 15000 - Location center: 0,0 - Standard zoom Title: Re: Complex powers Post by: Fractal Ken on January 18, 2011, 10:34:09 PM Cool pic!
Here's a Mandelbrot-type image where I've zoomed into the interior, i.e, non-escape region. I believe the coloring method I've used is called an orbit trap. (I can provide details if anyone's interested.) (http://i1122.photobucket.com/albums/l540/Fractal_Ken/ComplexExponent3.png) z = z^(0.0, 0.5) + c; Iterations = 110; Rotated -90 degrees I struggle with the notation and terminology folks use. The unrotated image is centered at (-0.9065, -0.2870), but I don't have a frame of reference to compute a zoom magnification. If it helps: x varies from -0.951 to -0.862, and y varies from -0.350 to -0.224. Title: Re: Complex powers Post by: Kali on January 18, 2011, 11:03:45 PM As I mentioned I was using UF5, I mean with "standard zoom", the zoom the program has for default, without touching anything.
I guess the notation you used it's the right one... Title: Re: Complex powers Post by: Fractal Ken on January 18, 2011, 11:24:49 PM Kali, I use software I wrote myself, and I'm unfamiliar with UF5's terminology. I certainly didn't mean to imply there's anything wrong with it. Perhaps someone else can provide a translation between the two ways of describing zoom.
Regards, Ken Title: Re: Complex powers Post by: Kali on January 18, 2011, 11:58:07 PM Anyway, besides UF5 terminology, just wanted to say "no zoom", or the zoom level that shows the whole mandelbrot set if using the standard formula... -2 to 2 on the real axis (x), I guess... I'm also don't know much about notations :embarrass: |