Hi, On Sun, May 02, 2010 at 08:29:44AM -0700, Ben Goodrich wrote: > Hi Mateusz, > > This works with the high-level code but does not work with the low- > level code in polys9: > > from sympy.polys.monomialtools import monomial_lex_key as O_lex > from sympy.polys.groebnertools import * > from sympy.polys.polytools import basic_from_dict > > gens = [x,y] > u = 1 > > f = sdp_from_dict(Poly(x, *gens).rep.to_dict(), O_lex) > g = sdp_from_dict(Poly(y, *gens).rep.to_dict(), O_lex) > > In [9]: sdp_quo(sdp_mul(f, g, u, O_lex, QQ), g, u, O_lex, QQ) # f > expected > --------------------------------------------------------------------------- > TypeError Traceback (most recent call > last) > > /tmp/mattpap-sympy-polys-9994e86/<ipython console> in <module>() > > /tmp/mattpap-sympy-polys-9994e86/sympy/polys/groebnertools.pyc in > sdp_quo(f, g, u, O, K) > 393 def sdp_quo(f, g, u, O, K): > 394 """Returns polynomial quotient in `K[X]`. """ > --> 395 q, r = sdp_div(f, g, u, O, K) > 396 > 397 if not r: > > /tmp/mattpap-sympy-polys-9994e86/sympy/polys/groebnertools.pyc in > sdp_div(f, G, u, O, K) > 374 while f: > 375 for i, g in enumerate(G): > --> 376 tq = term_div(sdp_LT(f, u, K), sdp_LT(g, u, K), K) > 377 > 378 if tq is not None: > > /tmp/mattpap-sympy-polys-9994e86/sympy/polys/groebnertools.pyc in > _term_ff_div(a, b, K) > 340 b_lm, b_lc = b > 341 > --> 342 monom = monomial_div(a_lm, b_lm) > 343 > 344 if monom is not None: > > /tmp/mattpap-sympy-polys-9994e86/sympy/polys/monomialtools.pyc in > monomial_div(A, B) > 180 > 181 """ > --> 182 C = [ a - b for a, b in zip(A, B) ] > 183 > 184 if all([ c >= 0 for c in C ]): > > TypeError: zip argument #2 must support iteration >
this happens because sdp_quo() implements generalized division algorithm, so the second argument to sdp_quo() must be a list (or any other iterable container), e.g.: h = sdp_mul(f, g, u, O_lex, QQ) q = sdp_quo(h, [g], u, O_lex, QQ) > Thanks, > Ben > > -- > You received this message because you are subscribed to the Google Groups > "sympy" group. > To post to this group, send email to sy...@googlegroups.com. > To unsubscribe from this group, send email to > sympy+unsubscr...@googlegroups.com. > For more options, visit this group at > http://groups.google.com/group/sympy?hl=en. > -- Mateusz
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