Hi! On 2012-12-21, Emmanuel Charpentier <emanuel.charpent...@gmail.com> wrote: > But why do we have to use max_symbolic ? As far as I can tell, max, like=20 > many other functions in Sage, could be overloaded to call max_symbolic when= > used with a symbolic argument, no ? After all, we don't have to write=20 > plus_symbolic(a,b) instead of a+b...=20
That's a substantial difference, IMHO. If you do a+b, then Python calls a.__add__(b). So, Python being object oriented, you can easily overload the a.__add__ method. Sage has the class sage.structure.element.RingElement, which overloads the __add__ method, and if you sub-class it, you should in fact implement _add_ with single underscore. But max is a Python builtin *function*. Overloading it by something else would break a lot of things, and I guess performance would suffer, if you overload max() by a function that first checks whether one of the arguments is a symbolic expression. Best regards, Simon > ------=_Part_25_22668100.1356102514858 > Content-Type: text/html; charset=ISO-8859-1 > Content-Transfer-Encoding: quoted-printable > > Dear Sir,<div><br></div><div>Thank you for your prompt advice. Some comment= > s below :<br><br>Le vendredi 21 d=E9cembre 2012 15:03:45 UTC+1, kcrisman a = >=E9crit :<blockquote class=3D"gmail_quote" style=3D"margin: 0;margin-l= > eft: 0.8ex;border-left: 1px #ccc solid;padding-left: 1ex;"><blockquote clas= > s=3D"gmail_quote" style=3D"margin:0;margin-left:0.8ex;border-left:1px #ccc = > solid;padding-left:1ex"><br>I am in the process of learning Sage, coming fr= > om Maxima (and Mathematica, which I do not like much...).<div> () ascii ribbon campaign -- save bandwith /\ www.asciiribbon.org -- avoid proprietary attachments -- You received this message because you are subscribed to the Google Groups "sage-support" group. To post to this group, send email to sage-support@googlegroups.com. To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com. Visit this group at http://groups.google.com/group/sage-support?hl=en.
