File:Critical orbits for f(z)=z^4-z.png
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Summary
DescriptionCritical orbits for f(z)=z^4-z.png |
English: Critical orbits for f(z)=z^4-z.[1] Because critical orbit tends to fixed point very slowly there is a gap between critical orbit and fixed point. |
Date | |
Source | Own work |
Author | Adam majewski |
Licensing
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Maxiam CAS src code
It is a batch file. Save it as a c.mac and use :
batch("c.mac");
Here is the code :
kill(all); remvalue(all); /*------------- functions definitions ---------*/ /* function */ f(z):=z^4 -z; GiveListOfCriticalPoints(fun):= block( [d,s], /* derivative */ d:diff(fun,z,1), /* critical points z: d=0 */ s:solve(d=0,z), /* remove "z=" from list s */ s:map('rhs,s), /* convert to form x+y*%i */ s:map('rectform,s), s:map('float,s), return(s) )$ /* f(z) is used as a global function I do not know how to put it as a argument */ GiveOrbit(z0,OrbitLength):= block( [z,Orbit], z:z0, Orbit:[[realpart(z),imagpart(z)]], for i:1 thru OrbitLength step 1 do ( z:expand(f(z)), Orbit:endcons([realpart(z),imagpart(z)],Orbit)), return(Orbit) )$ /* find fixed points returns a list */ GiveFixedPoints():= block ( [s], s:solve(f(z)=z), /* remove "z=" from list s */ s:map('rhs,s), s:map('rectform,s), s:map('float,s), return(s) )$ compile(all); /* ------------ */ iLength:10000; /* compute a list of critical points */ s:GiveListOfCriticalPoints(f(z)); multiplicities; length(s); /* compute orbit of every critical point and join them into one list */ Orbits:[]; for i:1 thru length(s) step 1 do ( Orbit:GiveOrbit(s[i],iLength), Orbits:append(Orbit,Orbits) ); /*-----------------------------------------------------------------------*/ load(draw); /* ( interface to gnuplot ) by Mario Rodriguez Riotorto http://www.telefonica.net/web2/biomates */ draw2d( title = "All critical orbits for f(z)=z^4 -z ", terminal = png, user_preamble = "set angles degrees; set grid polar 30; set xtics 0.62996052494744; set mxtics 0.62996052494744; set size square", /* 360/12=30 */ file_name = concat("~/",string(iLength),"b_52"), /* one can put here a path */ pic_width = 1000, /* Since Maxima 5.23, pic_width and pic_height are deprecated. */ pic_height = 1000, /* See option dimensions. To get the same effect, write dimensions=[800,600] */ yrange = [-1.0,1.0], xrange = [-1.0,1.0], xlabel = "z.re ", ylabel = "z.im", point_type = filled_circle, points_joined = false, point_size = 0.7, key=" critical orbit ", color =red, points(Orbits), point_size = 1.2, key= "critical points", color = blue, points(map(realpart,s),map(imagpart,s)), key= "fixed parabolic point", color = black, points([[0,0]]) );
References
Items portrayed in this file
depicts
some value
10 March 2013
image/png
7b2375620dbc0abb065ff5a311de5d41f20a0504
23,317 byte
1,000 pixel
1,000 pixel
File history
Click on a date/time to view the file as it appeared at that time.
Date/Time | Thumbnail | Dimensions | User | Comment | |
---|---|---|---|---|---|
current | 15:02, 13 March 2013 | 1,000 × 1,000 (23 KB) | Soul windsurfer | more points and better grid thru critical points | |
07:39, 10 March 2013 | 1,000 × 1,000 (25 KB) | Soul windsurfer | User created page with UploadWizard |
File usage
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