/usr/lib/open-axiom/input/knot.input is in open-axiom-test 1.4.1+svn~2626-2ubuntu2.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 | --Copyright The Numerical Algorithms Group Limited 1991.
)cl all
-- Create a (p,q) torus-knot with radius around the curve of r.
torusKnot(p,q,r) ==
a := 1
b := 1
ab := a+b
fac := 2*ab/(1.1*ab-sin(q*t))
Title := concat("Torus Knot of Type (", concat(string p,
concat(",", concat(string q, ")"))))
Curve := curve(a*fac*cos(p*t), a*fac*sin(p*t), b*fac*cos(q*t))
r = 0 => draw(Curve, t=0..2*%pi, title == Title)
draw(Curve, t=0..2*%pi, tubeRadius == r, title == Title)
torusKnot(2, 3, 0.3)
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