On Wednesday, March 21, 2018 at 6:29:37 PM UTC, saad khalid wrote: > > Hey everyone: > > I'm currently in the process of converting some code from Mathematica to > Sage, my primary motivation being that Mathematica is running it too slowly > and I was hoping that I could somehow get some increase in speed with Sage. > My thought was that this would be easiest if I were able to use cython > along with Sage. Is this currently possible? For example, one of the > Mathematica functions takes a polynomial in 2 variables as input and > computes the value of the order in one of the variables (ie for x1^3 + > x1*x2^2 + x2, the order for x1 would be 3). I wrote some Sage could that > can do this, but then how can I use what the sage code computes with cython > code? When I was trying to compile some cython code in Cocalc using > %cython, it would not let me include any Sage code. For eg, I tried > including the line: > R.<x1,x2> = RR[] > > but it threw errors at me. Do you think I am approaching this speed up > idea in a reasonable way? Or should I be trying to do it purely in Sage or > purely in cython? Thanks! >
A large part of the Sage library is written in Cython. Cython in Sage needs a bit more care. Did you read http://doc.sagemath.org/html/en/developer/coding_in_cython.html ? The following works in CoCalc ipython notebook: %cythondef tst(): from sage.rings.real_mpfr import RR from sage.rings.polynomial.polynomial_ring_constructor import PolynomialRing R2 = PolynomialRing(RR,'x1,x2') (x1,x2) = R2.gens() return x1**2-x2**3 Note that to get the needed import statements, you can run import_statements('RR'), etc ---------------- Tp -- 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 https://groups.google.com/group/sage-support. For more options, visit https://groups.google.com/d/optout.
