> > method. Thanks to Cython, this is very easy. However, Maxima and > > Ginac have a different semantic for those two functions: > > > > - Maxima: Does not change the expression; if the expression is not a > > quotient, then this will return the expression itself. > > - Ginac: try to normalize the expression to put it in the form N/D > > and then return N; > > > > For example, with an expression such as "x + y/(x + 2)", > > > > - Maxima: numer = x + y/(x + 2), denom = 1 > > - Ginac: numer = (x^2 + 2x + y), denom = x + 2 > > > > I can more or less emulate Maxima's behavior with Ginac, but I'm not > > sure what's best to do. I see several options: > > > > 1 - Forget about Maxima and follows Ginac semantic; > > 2 - Follows Maxima semantic as close as possible using Ginac; > > 3 - Have a parameter 'algorithm' to select the needed one. Depending > > one the algorithm the semantic differ; > > 4 - Have a parameter 'normal' to select if we normalize or nor the > > result before computing the numerator, always use Ginac however. > > 5 - 3 and 4, have two parameters, one for selecting Maxima or Ginac, > > one for performing a normalization before. > > 6 - other options ??? > > > > In case 3, 4, 5, we also should decide what is the default. > > > > What do you think ? > > I like 4 best, though I suggest calling the parameter 'normalize.' > > How do you plan to handle normalize=False? I suggest > > if the expression is not a mul: > return self > else: > separate the positive and negative exponents
This is indeed what I had in mind. Any idea for the default for normalize ? Cheers, Florent -- To post to this group, send an email to sage-devel@googlegroups.com To unsubscribe from this group, send an email to sage-devel+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URL: http://www.sagemath.org
