Visualizing Polyhedron with specified range

asked 9 years ago

yuyu
11 ●1 ●3

updated 8 years ago

FrédéricC

5426 ●4 ●44 ●121

I am working on visualizing an unbounded polyhedron with plot command. I have a trouble with the way the default visualizer plots the polyhedron. I would like to define range of (x,y,z) domain it visualizes as well as remove big blue arrow that indicates the direction on which the polyhedron extends to because unboundedness is obvious in my application.

The code I have used is following.

dd = Polyhedron(ieqs=[[0,1,-sqrt(2),0],[0,1,sqrt(2),0],[0,0,-sqrt(2),1],[0,0,sqrt(2),1]]) dd.plot(ymax=4)

answered 7 years ago

jipilab
543 ●17 ●18

First, to remove the arrows, one possible way is to use render_solid. The following code will not draw the rays (which are by default drawn as arrows).

sage: QF.<a> = QuadraticField(2)
sage: dd = Polyhedron(ieqs=[[0,1,-a,0],[0,1,a,0],[0,0,-a,1],[0,0,a,1]])
sage: dd.render_solid()

Second, to get a bigger picture, there is a work around by multiplying the rays by a certain scalar.

sage: dd2 = Polyhedron(rays = [100*r.vector() for r in dd.rays()])
sage: dd2.render_solid()

This is not as clean as specifying the ranges on each axis, but is a start.

Currently, to plot the polyhedron object, it uses the data of the polyhedron and it is not (yet) possible to set a certain range for the axis.

link

add a comment

Your Answer

Please start posting anonymously - your entry will be published after you log in or create a new account.

Visualizing Polyhedron with specified range

1 Answer

Your Answer

Question Tools

Stats

Related questions

Visualizing Polyhedron with specified range savecancel

1 Answer

Your Answer

Question Tools

Stats

Related questions

Visualizing Polyhedron with specified range