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>plot(t,x);
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Oh,No!
Jun 07, 2008
ããŒã¬ã³ãæ¹çšåŒ
æµäœã®ã«ãªã¹çãµããŸããè¡šãæ¹çšåŒãšããŠããŒã¬ã³ãæ¹çšåŒãããã1963幎Lorenz,E.N.ãâDeterministic Nonperiodic Flow",Journal of Atmospheric Sciencesã«çºè¡šããæ±ºå®è«çéåšææµãã®æ¹çšåŒã§ããã
dx/dt=-px+py
dy/dt=-xz+rx-y
dz/dt=xy-bz
ããŒã¬ã³ãããã®è«æã§äžããã®ã¯ã
p=10
r=28
b=8/3
ã§ããããã®å
ã«è§£ãããX,Y,Zã®è»è·¡ïŒã¢ãã©ã¯ã¿ïŒã瀺ãããã
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>function xdot=f(x,t)
xdot=zeros(1,3)
xdot(1)=-10*x(1)+10*x(2)
xdot(2)=-x(1)*x(3)+28*x(1)-x(2)
xdot(3)=x(1)*x(2)-8/3*x(3)
endfunction
>x0=[1;1;1];
>t=linspace(0,500,1000);
>x=lsode("f",x0.t);
>plot(t,x);
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May 09, 2008
é¢çœãæ²é¢ïŒãã®ïŒïŒïŒ

Sphere9
X = cos(u)*cos(v)*sin(u)
Y = cos(u)*sin(v)*cos(u)*sin(v)
Z = sin(u)*sin(v)*sin(u)*sin(v)
With U[ -pi/2, 0] And V[ 0, pi]

Sphere10
X = cos(u)*cos(v)*sin(u)*sin(v)*sin(v)*sin(v)
Y = cos(u)*sin(v)*cos(u)*sin(v)
Z = sin(u)*sin(v)*sin(u)*sin(v)*cos(u)
With U[ -pi/2, 0] And V[ 0, pi]

Star
X = cos(u)*cos(v)*(abs(cos(1*u/4))^0.5 + abs(sin(1*u/4))^0.5)^(-1/0.3)*(abs(cos(5*v/4))^1.7 + abs(sin(5*v/4))^1.7)^(-1/0.1)
Y = cos(u)*sin(v)*(abs(cos(1*u/4))^0.5 + abs(sin(1*u/4))^0.5)^(-1/0.3)*(abs(cos(5*v/4))^1.7 + abs(sin(5*v/4))^1.7)^(-1/0.1)
Z = sin(u)*(abs(cos(1*u/4))^0.5 + abs(sin(1*u/4))^0.5)^(-1/0.3)
With U[ -pi/2, pi/2] And V[ 0, 2*pi]

Star7
X = cos(u)*cos(v)*(abs(cos(7*v/4))^1.7 + abs(sin(7*v/4))^1.7)^(-1/0.2)*(abs(cos(7*u/4))^1.7 + abs(sin(7*u/4))^1.7)^(-1/0.2)
Y = cos(u)*sin(v)*(abs(cos(7*v/4))^1.7 + abs(sin(7*v/4))^1.7)^(-1/0.2)*(abs(cos(7*u/4))^1.7 + abs(sin(7*u/4))^1.7)^(-1/0.2)
Z = sin(u)*(abs(cos(7*u/4))^1.7 + abs(sin(7*u/4))^1.7)^(-1/0.2)
With U[ -pi/2, pi/2] And V[ 0, 2*pi]
May 07, 2008
é¢çœãæ²é¢ïŒãã®ïŒïŒïŒ

Sphere6
X = cos(u)*cos(v)*sin(u)
Y = sin(u)
Z = sin(u)*sin(v)*sin(u)
With U[ -pi/2, 0] And V[ 0, 2*pi]

Sphere7
X = cos(u)*cos(v)*sin(u)
Y = sin(u)*sin(v)*cos(u)
Z = sin(u)*sin(v)*sin(u)
With U[ -pi/2, 0] And V[ 0, 2*pi]

Sphere8
X = cos(u)*cos(v)*sin(u)
Y = cos(u)*sin(v)*cos(u)
Z = sin(u)*sin(v)*sin(u)
With U[ -pi/2, 0] And V[ 0, 2*pi]

Sphere9
X = cos(u)*cos(v)*sin(u)
Y = cos(u)*sin(v)*cos(u)*sin(v)
Z = sin(u)*sin(v)*sin(u)*sin(v)
With U[ -pi/2, 0] And V[ 0, pi]
May 01, 2008
é¢çœãæ²é¢ïŒãã®ïŒïŒïŒ

Sphere2
X = cos(u)*cos(v)
Y = cos(u)*sin(v)
Z = sin(u)*sin(v)
With U[ -pi/2, pi/2] And V[ 0, 2*pi]

Sphere3
X = cos(u)*cos(v)
Y = cos(u)*sin(v)
Z = sin(u)*sin(v)*cos(v)
With U[ -pi/2, pi/2] And V[ 0, 2*pi]

Sphere4
X = cos(u)*cos(v)
Y = cos(u)*sin(v)*sin(v)
Z = sin(u)*sin(v)
With U[ -pi/2, 0] And V[ 0, 2*pi]

Sphere5
X = cos(u)*cos(v)*sin(v)
Y = cos(u)*sin(v)*sin(v)
Z = sin(u)*sin(v)
With U[ -pi/2, 0] And V[ 0, 2*pi]
Apr 30, 2008
é¢çœãæ²é¢ïŒãã®ïŒïŒïŒ

Shape9
X = cos(u)*cos(v)*(abs(cos(2*u/4))^10 + abs(sin(2*u/4))^10)^(-1/10)*(abs(cos(8*v/4))^100 + abs(sin(8*v/4))^30)^(-1/60)
Y = cos(u)*sin(v)*(abs(cos(2*u/4))^10 + abs(sin(2*u/4))^10)^(-1/10)*(abs(cos(8*v/4))^100 + abs(sin(8*v/4))^30)^(-1/60)
Z = sin(u)*(abs(cos(2*u/4))^10 + abs(sin(2*u/4))^10)^(-1/10)
With U[ -pi/2, pi/2] And V[ 0, 2*pi]

Shape10
X = cos(u)*cos(v)*(abs(cos(3*u/4))^1 + abs(sin(3*u/4))^1)^(-1/1)*(abs(cos(6*v/4))^1 + abs(sin(6*v/4))^1)^(-1/1)
Y = cos(u)*sin(v)*(abs(cos(3*u/4))^1 + abs(sin(3*u/4))^1)^(-1/1)*(abs(cos(6*v/4))^1 + abs(sin(6*v/4))^1)^(-1/1)
Z = sin(u)*(abs(cos(3*u/4))^1 + abs(sin(3*u/4))^1)^(-1/1)
With U[ -pi/2, pi/2] And V[ 0, 2*pi]

Snail
X = u*cos(v)*sin(u)
Y = u*cos(u)*cos(v)
Z = -u*sin(v)
With U[ 0, 2] And V[ -pi/2, pi/2]

Snake
X = 1.2*(1 -v/(2*pi))*cos(3*v)*(1 + cos(u)) + 3*cos(3*v)
Y = 1.2*(1 -v/(2*pi))*sin(3*v)*(1 + cos(u)) + 3*sin(3*v)
Z = 9*v/(2*pi) + 1.2*(1 - v/(2*pi))*sin(u)
With U[ 0, 2*pi] And V[ 0, 2*pi]
Apr 28, 2008
é¢çœãæ²é¢ïŒãã®ïŒïŒïŒ

Pseudo Hexagon
X = 1.7*(cos(u)*cos(v)*(abs(cos(4*u/4))^300 + abs(sin(4*u/4))^300)^(-1/300)*(abs(cos(6*v/4))^400 + abs(sin(6*v/4))^400)^(-1/1000))
Y = 0.743482 * (1.5*(cos(u)*sin(v)*(abs(cos(4*u/4))^300 + abs(sin(4*u/4))^300)^(-1/300)*(abs(cos(6*v/4))^400 + abs(sin(6*v/4))^400)^(-1/1000)) * cos((1.7*(cos(u)*cos(v)*(abs(cos(4*u/4))^300 + abs(sin(4*u/4))^300)^(-1/300)*(abs(cos(6*v/4))^400 + abs(sin(6*v/4))^400)^(-1/1000)) - -1.7)*2*pi*0.3/3.4) - 0.7*(sin(u)*(abs(cos(4*u/4))^300 + abs(sin(4*u/4))^300)^(-1/300)) * sin((1.7*(cos(u)*cos(v)*(abs(cos(4*u/4))^300 + abs(sin(4*u/4))^300)^(-1/300)*(abs(cos(6*v/4))^400 + abs(sin(6*v/4))^400)^(-1/1000)) - -1.7)*2*pi*0.3/3.4))
Z = 0.743482 * (1.5*(cos(u)*sin(v)*(abs(cos(4*u/4))^300 + abs(sin(4*u/4))^300)^(-1/300)*(abs(cos(6*v/4))^400 + abs(sin(6*v/4))^400)^(-1/1000)) * sin((1.7*(cos(u)*cos(v)*(abs(cos(4*u/4))^300 + abs(sin(4*u/4))^300)^(-1/300)*(abs(cos(6*v/4))^400 + abs(sin(6*v/4))^400)^(-1/1000)) - -1.7)*2*pi*0.3/3.4) + 0.7*(sin(u)*(abs(cos(4*u/4))^300 + abs(sin(4*u/4))^300)^(-1/300)) * cos((1.7*(cos(u)*cos(v)*(abs(cos(4*u/4))^300 + abs(sin(4*u/4))^300)^(-1/300)*(abs(cos(6*v/4))^400 + abs(sin(6*v/4))^400)^(-1/1000)) - -1.7)*2*pi*0.3/3.4))
With U[ -pi/2, pi/2] And V[ 0, 2*pi]

Pseudo Sphere
X = cos(u)*cos(v)+sin((sin(u)+1)*2*pi)
Y = cos(u)*sin(v)+cos((sin(u)+1)*2*pi)
Z = 4*sin(u)
With U[ -pi/2, pi/2] And V[ 0, 2*pi]

Pseudo Torus
X = (1+ 0.5*cos(u))*cos(v)
Y = 0.632456 * ((1+ 0.5*cos(u))*sin(v) * cos(((1+ 0.5*cos(u))*cos(v) - -1.5)*2*pi*0.9/3) - 0.5*sin(u) * sin(((1+ 0.5*cos(u))*cos(v) - -1.5)*2*pi*0.9/3))
Z = 0.632456 * ((1+ 0.5*cos(u))*sin(v) * sin(((1+ 0.5*cos(u))*cos(v) - -1.5)*2*pi*0.9/3) + 0.5*sin(u) * cos(((1+ 0.5*cos(u))*cos(v) - -1.5)*2*pi*0.9/3))
With U[ 0, 2*pi] And V[ 0, 2*pi]

Roman
X = 1/2*sin(2*u)*sin(v)^2
Y = 1/2*sin(u)*cos(2*v)
Z = 1/2*cos(u)*sin(2*v)
With U[ 0, pi] And V[ -pi/2, pi/2]

Shape8
X = cos(u)*cos(v)*(abs(cos(3*u/4))^100 + abs(sin(3*u/4))^100)^(-1/100)*(abs(cos(2*v/4))^0.3 + abs(sin(2*v/4))^0.2)^(-1/0.7)
Y = cos(u)*sin(v)*(abs(cos(3*u/4))^100 + abs(sin(3*u/4))^100)^(-1/100)*(abs(cos(2*v/4))^0.3 + abs(sin(2*v/4))^0.2)^(-1/0.7)
Z = sin(u)*(abs(cos(3*u/4))^100 + abs(sin(3*u/4))^100)^(-1/100)
With U[ -pi/2, pi/2] And V[ 0, 2*pi]
Apr 27, 2008
FrontGUIãããèšç®ïŒãã®ïŒïŒ
Dr.Chenã®FrontGUIã«ãŠãšã«ããŒå ã®æµäœæµåè§£æã詊ãèšç®ãããRe=100ã®æµåç¶æ ã®èšç®äŸã§ããå ¥ãå£ã«æµéïŒãäžæµã¯ããªãŒããªãã¡å§åïŒïŒãšå£é¢ã«åºå®å£å¢çãäžããŠèšç®ãããå§åãŸãæµéã®ããããã®é床æåã¯æéå¹³åã®å€ã瀺ããRe=100ã§ããæéå¹³åãããšæå€ãšããããªååžã瀺ããŠãããæéããšã®ç¶æ éããšã£ãŠåç»ãäœãã°ãã£ãšè©³çްãªç¶æ ã瀺ãããšã§ããããããã§ã¯ãããèšç®ãªã®ã§æéããšã®ç¶æ ãå šéšèšé²ããŠæµãã®æ§åã衚ãããšã¯ããã«ãæéå¹³åã®å§åååžç¶æ ãšïŒæ¹åã®é床æåã瀺ãããšãšããã

Model

Mesh

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Apr 25, 2008
DE-CENTERïŒãã®ïŒïŒ
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Model

Mesh

Stress and Displacemen

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Stress
Apr 24, 2008
é¢çœãæ²é¢ïŒãã®ïŒïŒïŒ

Kinky Torus
X = 1/cosh(u) - cos(v)
Y = sin(v)
Z = u / pi - tanh(v)
With U[ -2*pi, 2*pi] And V[ -pi, pi]

Limpet Torus
X = cos(u) / (sqrt(2) + sin(v))
Y = sin(u) / (sqrt(2) + sin(v))
Z = 1 / (sqrt(2) + cos(v))
With U[ -pi, pi] And V[ -pi, pi]

Maeder's Owl
X = v *cos(u) - 0.5* v^2 * cos(2* u)
Y = -v *sin(u) - 0.5* v^2 * sin(2* u)
Z = 4 *v^1.5 * cos(3 *u / 2) / 3
With U[ 0, 4*pi] And V[ 0, 1]

Pseudo Catenoid
X = 2.2*(2*cosh(v/2)*cos(u))
Y = 1.51166 * (2*cosh(v/2)*sin(u) * cos((2.2*(2*cosh(v/2)*cos(u)) - -11.0404)*2*pi*1/22.0513) - 1.8*(v) * sin((2.2*(2*cosh(v/2)*cos(u)) - -11.0404)*2*pi*1/22.0513))
Z = 1.51166 * (2*cosh(v/2)*sin(u) * sin((2.2*(2*cosh(v/2)*cos(u)) - -11.0404)*2*pi*1/22.0513) + 1.8*(v) * cos((2.2*(2*cosh(v/2)*cos(u)) - -11.0404)*2*pi*1/22.0513))
With U[ -pi, pi] And V[ -pi, pi]
Apr 17, 2008
é¢çœãæ²é¢ïŒãã®ïŒïŒ

Hellipticparboliod
X = v*2*cos(u)
Y = v*sin(u)
Z = v^2
With U[ 0, 2*pi] And V[ 0, 2]

Horn
X = (2 + u*cos(v))*sin(2*pi*u)
Y = (2 + u*cos(v))*cos(2*pi*u) + 2*u
Z = u *sin(v)
With U[ 0, 1] And V[ 0, 2*pi]

Implicit Lemnscap
X = cos(v)*sqrt(abs(sin(2*u)))*cos(u)
Y = cos(v)*sqrt(abs(sin(2*u)))*sin(u)
Z = x^2 - y^2 + 2*x*y*(tan(v)^2)
With U[ 0, pi] And V[ 0, pi]

Kidney
X = cos(u) *(3 *cos(v) - cos(3 *v))
Y = sin(u) *(3 *cos(v) - cos(3 * v))
Z = 3 *sin(v) - sin(3 * v)
With U[ 0, 2*pi] And V[ -pi/2, pi/2]
Apr 14, 2008
é¢çœãæ²é¢ïŒãã®ïŒïŒ

Enneper2
X = u*cos(v)-u^3/3*cos(3*v)
Y = -u*sin(v)-u^(3)/3*sin(3*v)
Z = u^2*cos(2*v)
With U[ 0, 1.2] And V[ -pi, pi]

Folium
X = cos(u) *(2*v/pi - tanh(v))
Y = cos(u + 2*pi / 3) / cosh(v)
Z = cos(u - 2*pi / 3) / cosh(v)
With U[ -pi, pi] And V[ -pi, pi]

Fresnel1
X = cos(u)*cos(v)/(-2.*sqrt(0.965/3.-0.935/3.*((cos(u)^4+sin(u)^4)*cos(v)^4+sin(v)^4))*cos((acos(-(-0.941/6.+0.374*((cos(u)^4+sin(u)^4)*cos(v)^4+sin(v)^4)-1.309/6.*((cos(u)^6+sin(u)^6)*cos(v)^6+sin(v)^6)-1.221*cos(u)^2*cos(v)^4*sin(u)^2*sin(v)^2)/sqrt(0.965/3.-0.935/3.*((cos(u)^4+sin(u)^4)*cos(v)^4+sin(v)^4))^3)+pi)/3.)+0.8)
Y = sin(u)*cos(v)/(-2.*sqrt(0.965/3.-0.935/3.*((cos(u)^4+sin(u)^4)*cos(v)^4+sin(v)^4))*cos((acos(-(-0.941/6.+0.374*((cos(u)^4+sin(u)^4)*cos(v)^4+sin(v)^4)-1.309/6.*((cos(u)^6+sin(u)^6)*cos(v)^6+sin(v)^6)-1.221*cos(u)^2*cos(v)^4*sin(u)^2*sin(v)^2)/sqrt(0.965/3.-0.935/3.*((cos(u)^4+sin(u)^4)*cos(v)^4+sin(v)^4))^3)+pi)/3.)+0.8)
Z = sin(v)/(-2.*sqrt(0.965/3.-0.935/3.*((cos(u)^4+sin(u)^4)*cos(v)^4+sin(v)^4))*cos((acos(-(-0.941/6.+0.374*((cos(u)^4+sin(u)^4)*cos(v)^4+sin(v)^4)-1.309/6.*((cos(u)^6+sin(u)^6)*cos(v)^6+sin(v)^6)-1.221*cos(u)^2*cos(v)^4*sin(u)^2*sin(v)^2)/sqrt(0.965/3.-0.935/3.*((cos(u)^4+sin(u)^4)*cos(v)^4+sin(v)^4))^3)+pi)/3.)+0.8)
With U[ 0, 2*pi] And V[ -pi/2, pi/2]

Fresnel2
X = cos(u)*cos(v)/(-2.*sqrt(0.965/3.-0.935/3.*((cos(u)^4+sin(u)^4)*cos(v)^4+sin(v)^4))*cos((acos(-(-0.941/6.+0.374*((cos(u)^4+sin(u)^4)*cos(v)^4+sin(v)^4)-1.309/6.*((cos(u)^6+sin(u)^6)*cos(v)^6+sin(v)^6)-1.221*cos(u)^2*cos(v)^4*sin(u)^2*sin(v)^2)/sqrt(0.965/3.-0.935/3.*((cos(u)^4+sin(u)^4)*cos(v)^4+sin(v)^4))^3)-pi)/3.)+0.8)
Y = sin(u)*cos(v)/(-2.*sqrt(0.965/3.-0.935/3.*((cos(u)^4+sin(u)^4)*cos(v)^4+sin(v)^4))*cos((acos(-(-0.941/6.+0.374*((cos(u)^4+sin(u)^4)*cos(v)^4+sin(v)^4)-1.309/6.*((cos(u)^6+sin(u)^6)*cos(v)^6+sin(v)^6)-1.221*cos(u)^2*cos(v)^4*sin(u)^2*sin(v)^2)/sqrt(0.965/3.-0.935/3.*((cos(u)^4+sin(u)^4)*cos(v)^4+sin(v)^4))^3)-pi)/3.)+0.8)
Z = sin(v)/(-2.*sqrt(0.965/3.-0.935/3.*((cos(u)^4+sin(u)^4)*cos(v)^4+sin(v)^4))*cos((acos(-(-0.941/6.+0.374*((cos(u)^4+sin(u)^4)*cos(v)^4+sin(v)^4)-1.309/6.*((cos(u)^6+sin(u)^6)*cos(v)^6+sin(v)^6)-1.221*cos(u)^2*cos(v)^4*sin(u)^2*sin(v)^2)/sqrt(0.965/3.-0.935/3.*((cos(u)^4+sin(u)^4)*cos(v)^4+sin(v)^4))^3)-pi)/3.)+0.8)
With U[ 0, 2*pi] And V[ -pi/2, pi/2]

Heart
X = cos(u)*(4*sqrt(1-v^2)*sin(abs(u))^abs(u))
Y = sin(u) *(4*sqrt(1-v^2)*sin(abs(u))^abs(u))
Z = v
With U[ -pi, pi] And V[ -1, 1]
Apr 08, 2008
é¢çœãæ²é¢ïŒãã®ïŒïŒ

Cross cap
X = (sin(u) * sin(2 * v) / 2)
Y = (sin(2 * u) * cos(v) * cos(v))
Z = (cos(2 * u) * cos(v) * cos(v))
With U[ -pi/2, pi/2] And V[ -pi/2, pi/2]

Dini
X = cos(u)*sin(v)
Y = sin(u)*sin(v)
Z = (cos(v)+log(tan(v/2))) + 0.2*u
With U[ 0, 12.4] And V[ 0.1, 2]

Drop
X = u*cos(v)
Y = u*sin(v)
Z = exp(-u*u)*(sin(2*pi*u) - u*cos(3*v))
With U[ 0, 2] And V[ 0, 2*pi]

EightSurface
X = cos(u)*sin(2*v)
Y = sin(u)*sin(2*v)
Z = sin(v)
With U[ 0, 2*pi] And V[ -pi/2, pi/2]

Enneper2
X = u*cos(v)-u^3/3*cos(3*v)
Y = -u*sin(v)-u^(3)/3*sin(3*v)
Z = u^2*cos(2*v)
With U[ 0, 1.2] And V[ -pi, pi]
Br>
Apr 06, 2008
é¢çœãæ²é¢ïŒãã®ïŒïŒ

Apple
X = cos(u) *(4 + 3.8* cos(v))
Y = sin(u) *(4 + 3.8* cos(v))
Z = (cos(v) + sin(v) - 1)* (1 + sin(v)) *log(1 - pi *v / 10) + 7.5 *sin(v)
With U[ 0, 2*pi] And V[ -pi, pi]

Bent Horns
X = (2 + cos(u))*(v/3 - sin(v))
Y = (2 + cos(u - 2*pi / 3)) *(cos(v) - 1)
Z = (2 + cos(u + 2*pi / 3))*(cos(v) - 1)
With U[ -pi, pi] And V[ -2*pi, 2*pi]

Boy
X = 2/3* (cos(u)* cos(2*v) + sqrt(2)* sin(u)* cos(v))* cos(u) / (sqrt(2) - sin(2*u)* sin(3*v))
Y = 2/3* (cos(u)* sin(2*v) - sqrt(2)* sin(u)* sin(v))* cos(u) / (sqrt(2) - sin(2*u)* sin(3*v))
Z = sqrt(2)* cos(u)* cos(u) / (sqrt(2) - sin(2*u)* sin(3*v))
With U[ 0, pi] And V[ 0, pi]

Cliffordtorus
X = cos(u+v)/(sqrt(2.)+cos(v-u))
Y = sin(u+v)/(sqrt(2.)+cos(v-u))
Z = sin(v-u)/(sqrt(2.)+cos(v-u))
With U[ 0, pi] And V[ 0, 2*pi]

Cone
X = u*cos(v)
Y = u*sin(v)
Z = u
With U[ -1, 1] And V[ 0, 2*pi]
Apr 04, 2008
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Apr 01, 2008
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Star
X = cos(u)*cos(v)*(abs(cos(1*u/4))^0.5 + abs(sin(1*u/4))^0.5)^(-1/0.3)*(abs(cos(5*v/4))^1.7 + abs(sin(5*v/4))^1.7)^(-1/0.1)
Y = cos(u)*sin(v)*(abs(cos(1*u/4))^0.5 + abs(sin(1*u/4))^0.5)^(-1/0.3)*(abs(cos(5*v/4))^1.7 + abs(sin(5*v/4))^1.7)^(-1/0.1)
Z = sin(u)*(abs(cos(1*u/4))^0.5 + abs(sin(1*u/4))^0.5)^(-1/0.3)

Steiner
X = (sin(2 * u) * cos(v) * cos(v))
Y = (sin(u) * sin(2 * v))
Z = (cos(u) * sin(2 * v))
With U[ -pi/2, pi/2] And V[ -pi/2, pi/2]

Stereo Sphere
X = 2.*u/(u*u+v*v+1.)
Y = 2.*v/(u*u+v*v+1.)
Z = (u*u+v*v-1.)/(u*u+v*v+1.)
With U[ -2, 2] And V[ -2, 2]

Triaxial Hexatorus
X = sin(u) / (sqrt(2) + cos(v))
Y = sin(u+2*pi/3) / (sqrt(2) + cos(v+2*pi/3))
Z = cos(u-2*pi/3) / (sqrt(2) + cos(v-2*pi/3))
With U[ -pi, pi] And V[ -pi, pi]

Twisted Triaxial
X = (1-sqrt(u*u + v*v) / sqrt(2*pi*pi))*cos(u)*cos(v)+sqrt(u*u + v*v) / sqrt(2*pi*pi)*sin(u)*sin(v)
Y = (1-sqrt(u*u + v*v) / sqrt(2*pi*pi))*cos(u+2*pi/3)*cos(v+2*pi/3)+sqrt(u*u + v*v) / sqrt(2*pi*pi)*sin(u+2*pi/3)*sin(v+2*pi/3)
Z = (1-sqrt(u*u + v*v) / sqrt(2*pi*pi))*cos(u+4*pi/3)*cos(v+4*pi/3)+sqrt(u*u + v*v) / sqrt(2*pi*pi)*sin(u+4*pi/3)*sin(v+4*pi/3)
With U[ -pi, pi] And V[ -pi, pi]
Mar 02, 2008
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