It seems to be a bug. As shown in the figure, the computed closest vector is not in the lattice.
For copy-paste convenience, see the following. from sage.modules.free_module_integer import IntegerLattice L = Matrix(ZZ,[[20957228, -4966110],[ 9411844, 19625639]]) L = IntegerLattice(L) targ = Matrix([-10663326362211/114509810943883, -453593624348888995904502033 /114509810943883]) v0 = Matrix([-423434678248195, -18882583298608161305227077482]) cv = L.closest_vector(targ-v0) print(cv in L) -- You received this message because you are subscribed to the Google Groups "sage-devel" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-devel+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/sage-devel/f4f6fc4d-a2ff-4c78-b614-49571d18a3aeo%40googlegroups.com.
