On Mon, Mar 30, 2009 at 7:19 AM, Maurizio <maurizio.gran...@gmail.com> wrote: > > One question: is there any plan to replace expand(), factor() and > other functions like these?
Replace them with what? Do you mean, implement them? >I don't see them mentioned in the todo, > and I always find their usage so much time consuming... Do you mean that they are too slow in the current symbolics? > > Thanks > > Maurizio > > On Mar 29, 1:47 pm, Burcin Erocal <bur...@erocal.org> wrote: >> Hi, >> >> I put up a preliminary todo list for the switch to pynac here: >> >> http://wiki.sagemath.org/symbolics/switch_todo >> >> I made the list by changing the default of the "var" command to create >> pynac variables, and running the doctests. Looking at the results I >> realised that I should have made other changes, such as export the new >> symbolic ring (NSR) to the command line as SR. These are listed in the >> first section of that page. >> >> Next section gives a list of methods which the pynac symbolic >> expressions (sage.symbolic.expression.Expression) need to implement. >> The last section is miscellaneous stuff I didn't want to classify >> further. >> >> Some time next week, I will put a clean version of the switchover >> patch, along with a new pynac package and some fixes to the sage >> library so others can reproduce the results above. >> >> After looking through the errors caused by the switch, I have a few >> questions: >> >> - Syntax for derivative and integrate functions: >> >> Current symbolics allows this: >> >> sage: (x^2).integrate() >> x^3/3 >> >> I propose to make the integration variable explicit, by deprecating >> this use, and encouraging the use of this: >> >> sage: (x^2).integrate(x) >> x^3/3 >> >> Note that the MMA syntax for Integrate also asks for the variable >> explicitly. >> >> Same goes for .derivative(), current symbolics works without specifying >> a variable. While this usage might be ok in a univariate polynomial >> ring, where the variable is known already, I think it's better to ask >> the user to explicitly state the variable. >> >> - What do we do with the old tests? >> >> In the sage/calculus/ directory there are files which contain only >> tests. What shall I do with these? Copy them to sage/symbolics/test, >> change the old ones to use old symbolics variables to test the old >> code, and make the new copies test the new code? >> >> Or, what do you think should happen to the old code? How long are we >> going to keep it around? >> >> Comments? >> >> Cheers, >> Burcin > > > -- William Stein Associate Professor of Mathematics University of Washington http://wstein.org --~--~---------~--~----~------------~-------~--~----~ 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 For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://www.sagemath.org -~----------~----~----~----~------~----~------~--~---
