Hi, I finally found time to write those _sage_ methods in SymPy we discussed earlier. The code is here:
http://dakol.hopto.org/sympy-sage/ (we are in the state of moving from Subversion to Mercurial in SymPy). I created a new sympy spkg, by updating it's hg repository: http://dakol.hopto.org/sympy-spkg/ (the change is trivial, because the src is not included). The spkg can be downloaded from: http://dakol.fsik.cvut.cz/~ondra/sympy-0.5.5.spkg Install with: ./sage -i sympy-0.5.5.spkg Now test it. Run this in sage: --------------------------------------------- #!/usr/bin/env sage #import sys #sys.path.insert(0,"/home/ondra/ext/sympy-sage/") from sympy import __version__ print __version__ print "SAGE:" e = 1/cos(x)**3 print e f = e.taylor(x, 0, 8) print f print "SymPy:" from sympy import Symbol, cos, sympify, pprint from sympy.abc import x e = sympify(1)/cos(x)**3 print e f = e.series(x, 10) print f print "\nSymPy pretty printer:" pprint(e) pprint(f) print "\nSymPy -> SAGE:" print e._sage_() print f._sage_() ------------------------------------------- it will produce the following output (I put the code above into example.sage): [EMAIL PROTECTED]:~/ext/sage-2.8.7-debian32-i686-Linux$ ./sage example.sage 0.5.5-svn SAGE: 1 ------- 3 cos (x) 8 6 4 2 8651 x 241 x 11 x 3 x ------- + ------ + ----- + ---- + 1 13440 240 8 2 SymPy: cos(x)**(-3) 1 + (3/2)*x**2 + (11/8)*x**4 + (241/240)*x**6 + (8651/13440)*x**8 + O(x**10) SymPy pretty printer: -3 cos (x) 2 4 6 8 3*x 11*x 241*x 8651*x 1 + ---- + ----- + ------ + ------- + O(x**10) 2 8 240 13440 SymPy -> SAGE: 1 ------- 3 cos (x) 8 6 4 2 8651 x 241 x 11 x 3 x ------- + ------ + ----- + ---- + 1 13440 240 8 2 Currently only the Add, Mul, Pow, Rational, Integer, sin, cos classes have the _sage_ method, but that is enough for some basic playing. Let's now implement the corresponding _sympy_ method in SAGE and maybe a few more iterations to see if we like it. And if so, I'll implement the _sage_() for more SymPy classes. I'd like to achieve a state, where the same code in SAGE could be run on both backends (Maxima and SymPy). That way we could easily see where Maxima is better than SymPy and vice versa. Could you William please create a trac login for me? I'd like to open and discuss a new ticket for it. Also so that I can attach any bundles in there. Are you planning to make another SAGE release before SD 6? If so, it would be good if we could make it before it, then we'll release SymPy, create spkg, you'll release SAGE, include the spkg, so that it's working out of the box for everyone at SD6 and we can discuss some new more exciting things to do in Bristol. I am sorry it has taken me so long, I was really busy. Ondrej --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to sage-devel@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://sage.scipy.org/sage/ and http://modular.math.washington.edu/sage/ -~----------~----~----~----~------~----~------~--~---
