File:Critical orbits f(z) =z^5 +(0.8+0.8)*z^4 + z.png
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DescriptionCritical orbits f(z) =z^5 +(0.8+0.8)*z^4 + z.png |
English: Critical orbits f(z) =z^5 +(0.8+0.8)*z^4 + z. Here ther are 4 critical points, 3 fixed points[1] |
Date | |
Source | Own work |
Author | Adam majewski |
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Maxima CAS src code[edit]
- ListOfCriticalPoints : (- 0.7558074500261052 %i) - 0.7558074500261052, 0.2793534499540583 %i - 0.5310341598343944, 0.2793534499540583 - 0.5310341598343943 %i, 0.3674881599064412 %i + 0.3674881599064413 with multiplicities= [1, 1, 1, 1]
- finite fixed points : [(- 0.8 %i) - 0.8, 0.0] with stability: [0.6384000000000008, 1.0]
- distance to fixed points after iLength:30000 forward iterations:
- d1:GiveDistance(first(Orbit1),fixed[1]) = 0.0624977035289329
- d2:GiveDistance(first(Orbit2),fixed[2]) = 0.6000296900256318
- d3:GiveDistance(first(Orbit3),fixed[2]) = 0.6000296900256316
- d4:GiveDistance(first(Orbit4),fixed[2]) = 0.5197067397512218
batch file for Maxima CAS use : - save as p.mac - run Maxima - batch ("p.mac")
kill(all); remvalue(all); /*------------- functions definitions ---------*/ /* function */ f(z):=z^5 +(0.8+0.8*%i)*z^4 + z; /* multiplier */ define(multiplier(z), diff(f(z),z,1)); stability(z):= block( [s], s:multiplier(z), s: rectform(s), s: float(s), s: cabs(s), return(s) )$ 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:[z], for i:1 thru OrbitLength step 1 do ( z:expand(f(z)), Orbit:endcons(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) )$ /* converts complex number z = x*y*%i to the list in a draw format: [x,y] */ d(z):=[float(realpart(z)), float(imagpart(z))]$ ToPoint(z):= points([d(z)])$ /* give Draw List from one point*/ dl(z):=[d(z)]$ ToPoints(myList):= points(map(d,myList))$ GiveDistance(z1,z2):= cabs(z1-z2)$ compile(all); /* ------------ */ iLength:30000; ListOfCriticalPoints:GiveListOfCriticalPoints(f(z))$ multiplicities; ListOfCriticalPoints; fixed :GiveFixedPoints(); stability_list : map(stability, fixed); Orbit1: GiveOrbit(ListOfCriticalPoints[1],iLength)$ Orbit2: GiveOrbit(ListOfCriticalPoints[2],iLength)$ Orbit3: GiveOrbit(ListOfCriticalPoints[3],iLength)$ Orbit4: GiveOrbit(ListOfCriticalPoints[4],iLength)$ d1: GiveDistance( first(Orbit1), fixed[1]); d2: GiveDistance( first(Orbit2), fixed[2]); d3: GiveDistance( first(Orbit3), fixed[2]); d4: GiveDistance( first(Orbit4), fixed[2]); /* fixed: ToPoints(fixed)$ */ f1: ToPoint(fixed[1]); f2: ToPoint(fixed[2]); Orbit1 : ToPoints(Orbit1)$ Orbit2 : ToPoints(Orbit2)$ Orbit3 : ToPoints(Orbit3)$ Orbit4 : ToPoints(Orbit4)$ cr1: ToPoint(ListOfCriticalPoints[1])$ cr2: ToPoint(ListOfCriticalPoints[2])$ cr3: ToPoint(ListOfCriticalPoints[3])$ cr4: ToPoint(ListOfCriticalPoints[4])$ /*-----------------------------------------------------------------------*/ load(draw); /* ( interface to gnuplot ) by Mario Rodriguez Riotorto http://www.telefonica.net/web2/biomates */ draw2d( title = "All critical orbits for f(z)=z^5 +(0.8+0.8*i)*z^4 + z", terminal = png, user_preamble = "set size square", /* 360/26=13.85 ; 360/(2*26)=6,923 */ file_name = concat("~/Dokumenty/julia_mse/maxima/1/", string(iLength)), dimensions = [1000, 1000], /* Since Maxima 5.23, pic_width and pic_height are deprecated. */ yrange = [-1.0,1.0], xrange = [-1.0,1.0], xlabel = "z.re ", ylabel = "z.im", point_type = filled_circle, points_joined = false, color = red, point_size = 0.7, points_joined = true, key=" critical orbit 1", Orbit1, point_size = 1.2, key= "", points_joined = false, cr1, color = magenta, point_size = 0.7, points_joined = true, key=" critical orbit 2", Orbit2, point_size = 1.4, key = "", points_joined = false, cr2, color = grey, point_size = 0.7, points_joined = true, key=" critical orbit 3", Orbit3, point_size = 1.4, key= "", points_joined = false, cr3, color = purple, point_size = 0.7, points_joined = true, key=" critical orbit 4", Orbit4, point_size = 1.4, key= "", points_joined = false, cr4, key= "attracting fixed point", color = green, f1, key= "parabolic fixed point", color = black, f2 );
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