Either I am doing something wrong or a simple operation which should be fast is in fact very slow, but I do not know why.
If V,W are vector spaces over QQ, subspaces of the same ambient space, then V.sum(W) should return their sum, with an echelon basis obtained from the bases of V and W. But this takes a stupidly long time. For example: sage: Q100=QQ^100 sage: V=Q100.subspace([Q100.random_element()]) sage: W=Q100.subspace([Q100.random_element()]) # so V,W are both 1-dimensional sage: V.sum(W) sage: time V.sum(W) # takes forever (on 5.3) -- why? John -- You received this message because you are subscribed to the Google Groups "sage-devel" group. To post to this group, send email to sage-devel@googlegroups.com. To unsubscribe from this group, send email to sage-devel+unsubscr...@googlegroups.com. Visit this group at http://groups.google.com/group/sage-devel?hl=en.
