Alasdair's profile - activity

Issues with interact - can't load widgets I'm running Sagemath 10.2.1 in Jupyter (and JupyterLab 4.0.10-1) in a newly up

Installation on docker using docker-compose? I'm running a VPS Using Ubuntu server, and docker, and I use docker-compose

2D Euclidean geometry in Sage? I haven't used Sage for a awhile, as my work has pulled me in other directions. Anyway,

First, my apologies if this is a trivial question. I am working through the powerset of a finite set of positive integers. I also have a predetermined value V. The idea is that as soon as I find a subset S whose elements sum to V or more, I want to remove all supersets of S, so that I don't have to test them. For example, suppose my set is {10,9,6,5} and V=16. When I find S = {10,9} has the property of I want, I can remove all supersets of {10,9} from further consideration. The final result will be just three subsets: {10,9}, {10,6}, and {9,6,5}.

I can do this "by hand" as it were, but is there a method already built-in for this? I've been fiddling around with lattices and posets and lower covers, but I can't get any of the methods to work.

I'd welcome any advice!

I'm trying to draw some 3D polyhedra. A search has brought up

https://ask.sagemath.org/question/419...

but I still can't get a live plot. I have constructed my polyhedron V from the Polyhedron class as an intersection of linear inequalities. The command V.plot() works by using the JMol engine, except that when I attempt to make it "live" all the edges and faces disappear and I have collection of vertices only.

I can also plot with tachyon; that works fine but doesn't allow rotating.

When I plot with threejs: V.plot(viewer='threejs',online=True) all it plots is the wireframe box surrounding the polyhedron; that is, the xyz "box" in which the polyhedron fits, but not the polyhedron itself.

So - how can I create a 3D polyhedron with a "live" plot that allows rotating?