Bulding a Torus Knot
matlab code (guide)
phi=str2double(get(handles.edit1,'String'));
q=str2double(get(handles.edit2,'String'));
C=str2double(get(handles.edit3,'String'))
theta=linspace(0,2*pi,200);
r=cos(q.*theta)+2;
x=r.*(cos(phi.*theta));
y=r.*(sin(phi.*theta));
z=-(sin(q.*theta));
C=min((phi-1).*q,(q-1).*phi) %%crossing number
(r-2).^2+z.^2==1;
axis(handles.axes1)
cla
plot3(x,y,z,'-y','LineWidth',2);
axis equal
axis off
rotate3d on
xlabel('X','fontSize',14);
ylabel('Y','fontSize',14);
zlabel('Z','fontsize',14);
title('Torus knot','fontsize',15)