On Wed, Sep 10, 2014 at 8:24 AM, Jeroen Demeyer <jdeme...@cage.ugent.be> wrote: > On 2014-09-10 17:18, William A Stein wrote: >> >> RR is pre-defined to be >> RealField(53), and overwriting that might cause confusion. > > How that? Nothing in Sage uses the "RR" global (and if it does, that's a > bug).
Here is how it could cause confusion. (1) Christophe is using Sage interactively and writes RR=RealField(1000). (2) Later in the session he does somethin, e.g., "random_matrix(RR,2)... etc." and cuts/pastes just that into an email or ask.sagemath question (etc.), but neglects to mention he redefined RR from the default. (3) Readers are confused. ... or .... (3) He pastes back something from before involving RR, and is himself confused. Or even the Sage session he is using restarts for some reason (or he types reset() for some reason), and RR is then switched back to being RealField(53), and he is confused. Every confusion above, and many I'm probably missing, would be avoided by typing R1000 = RealField(1000) instead of RR = RealField(1000). Thus I recommend "R1000 = RealField(1000)" or even "R = RealField(1000)". William -- William Stein Professor of Mathematics University of Washington http://wstein.org wst...@uw.edu -- You received this message because you are subscribed to the Google Groups "sage-support" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-support+unsubscr...@googlegroups.com. To post to this group, send email to sage-support@googlegroups.com. Visit this group at http://groups.google.com/group/sage-support. For more options, visit https://groups.google.com/d/optout.
