Thanks for all !!! Christophe BAL
2014-09-10 17:38 GMT+02:00 William A Stein <wst...@uw.edu>: > 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. > -- 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.
