/usr/share/SuperCollider/HelpSource/Classes/HenonL.schelp is in supercollider-common 1:3.8.0~repack-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 | class:: HenonL
summary:: Henon map chaotic generator
categories:: UGens>Generators>Chaotic
related:: Classes/HenonC, Classes/HenonN
description::
A linear-interpolating sound generator based on the difference equation:
teletype::
x(n+2) = 1 - a * x(n+1)^2 + b * x(n)
::
This equation was discovered by French astronomer Michel Hénon while studying the orbits of stars in globular clusters.
sclang code translation:
code::
(
var a = 1.4, b = 0.3, x0 = 0, x1 = 1, size = 64;
plot(size.collect { var aux = 1 - (a * (x1 ** 2)) + (b * x0); x0 = x1; x1 = aux; aux });
)
::
classmethods::
method:: ar
argument:: freq
Iteration frequency in Hertz
argument:: a
Equation variable
argument:: b
Equation variable
argument:: x0
Initial value of x
argument:: x1
Second value of x
examples::
code::
// default initial params
{ HenonL.ar(MouseX.kr(20, SampleRate.ir)) * 0.2 }.play(s);
// mouse-control of params
{ HenonL.ar(SampleRate.ir/4, MouseX.kr(1,1.4), MouseY.kr(0,0.3)) * 0.2 }.play(s);
// randomly modulate params
(
{ HenonL.ar(
SampleRate.ir/8,
LFNoise2.kr(1, 0.2, 1.2),
LFNoise2.kr(1, 0.15, 0.15)
) * 0.2 }.play(s);
)
// as a frequency control
{ SinOsc.ar(HenonL.ar(40, MouseX.kr(1,1.4), MouseY.kr(0,0.3))*800+900)*0.4 }.play(s);
::
|