Re: [sage-devel] does Sage support Grassmannians over finite fields?

On Tue, Mar 25, 2025 at 06:04:30PM -0400, Jackson Walters wrote: > Thanks, that's helpful. > > G = graphs.GrassmannGraph(5, 4, 2); G > > gives 806 vertices, as expected, but why do the vertices seem to have six > points? > > G.vertices()[0] > {(0, 0, 0, 1), (1, 0, 0, 1), (1, 0, 0, 2), (1, 0, 0,

Re: [sage-devel] does Sage support Grassmannians over finite fields?

I suppose it comes down to this: from sage.combinat.designs import design_catalog as designs PG = designs.ProjectiveGeometryDesign(4 - 1, 2 - 1, 5) PG.blocks()[0] [(1, 0, 0, 0), (1, 0, 0, 1), (1, 0, 0, 2), (1, 0, 0, 3), (1, 0, 0, 4), (0, 0, 0, 1)] On Tue, Mar 25, 2025 at 6:23 PM Jackson Walters

Re: [sage-devel] does Sage support Grassmannians over finite fields?

I guess they are projective lines with q+1 points arising from designs.ProjectiveGeometryDesign. However, the blocks (the 2-subspaces) should be in one-to-one correspondence with the vertices. On Tue, Mar 25, 2025 at 6:04 PM Jackson Walters wrote: > Thanks, that's helpful. > > G = graphs.Grassma

Re: [sage-devel] does Sage support Grassmannians over finite fields?

Thanks, that's helpful. G = graphs.GrassmannGraph(5, 4, 2); G gives 806 vertices, as expected, but why do the vertices seem to have six points? G.vertices()[0] {(0, 0, 0, 1), (1, 0, 0, 1), (1, 0, 0, 2), (1, 0, 0, 4), (1, 0, 0, 0), (1, 0, 0, 3)} I don't see anything about this in the documentati

Re: [sage-devel] does Sage support Grassmannians over finite fields?

We have functionality to build Grassmann graphs. See GrassmannGraph in On 25 March 2025 12:46:56 GMT-05:00, Jackson Walters wrote: >Does Sage support co

[sage-devel] does Sage support Grassmannians over finite fields?

Does Sage support computing Gr_{F_q}(k,r), the space of k-hyperplanes through the origin in GF(q**r)? I looked around for things like Schubert cells and didn't see anything immediately relevant. I've started to write some stuff for k=2. I may do a PR if it's not already available. Thanks, Jacks

[sage-devel] Not able to build sage from source

I was working on an issue on sagemath and have submitted a PR for that but now I am not able to build sage from Also the PR right now is failing almost all the different builds fail but this was not the issue 2 days ago right now whenever i run make

[sage-devel] Re: How to build sagelib with multiple processes in parallel?

FWIW, upgrading 6.10.beta9 to 6.10.rc0 on Debian testins ran in parallel. HTH, Le dimanche 23 mars 2025 à 19:57:40 UTC+1, Nils Bruin a écrit : > In the past I've build sagelib in parallel, with > > export MAKE="make -j8" > make -j8 build > > This seems to still work for the prerequisites, but fo

[sage-devel] How to build sagelib with multiple processes in parallel?

In the past I've build sagelib in parallel, with export MAKE="make -j8" make -j8 build This seems to still work for the prerequisites, but for building sagelib everything slows to an agonizing one job at a time. Did something change here? I can't find anything in the documentation other than th