Hi Volker, The first version (already documented and doctested) of toric lattices is on trac: http://trac.sagemath.org/sage_trac/ticket/9062 so you can take a look and comment if something is very bad. It is not quite ready for review yet, but I don't anticipate changing existing code - only adding some more.
These lattices allow creation and printing as "N(1,2,3)" and do not allow mixing of wrong lattices for a given operation, as you wanted. They behave "like ZZ^n", as I wanted. Elements are implemented in Cython and as I was working on them, I was trying to make sure that there are no big performance hits compared to just integer vectors. I still have to work on matrix operations and support for morphisms, but I don't anticipate any problems (everything is already in the Sage structure files, I just need to make sure that all the types are in agreement in necessary places). Then I will change cones and fans to use these lattices by default instead of ZZ^n. I wanted to have an option of suppressing lattice names in elements output, but so far I have found your idea of having them extremely convenient for debugging ;-) So instead of writing functions to get rid of the names now, I put it on my todo list for the future since there are more urgent things to do. Thank you, Andrey -- To post to this group, send an email to sage-devel@googlegroups.com To unsubscribe from this group, send an email to sage-devel+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URL: http://www.sagemath.org
