On Wednesday, May 25, 2016 at 3:31:23 AM UTC+3, Phillip M. Feldman wrote:
>
> I tried the following:
>
> In [1]: from sympy import *
> In [2]: R, x= ring('x', GF(2))
> In [3]: p= x**5 + 1
> In [4]: q= x+1
> In [5]: div(p, q)
>
> The result is an exception: SympifyError: x**5 + 1 mod 2
>
> Any advice will be appreciated.
>div(p, q) is intended for expressions. p and q are polynomials, not expressions. Division of polynomials is defined as a method: In [4]: p.div(q) Out[4]: (x**4 + x**3 + x**2 + x + 1 mod 2, 0 mod 2) > On Mon, May 23, 2016 at 10:05 PM, Kalevi Suominen <[email protected] > <javascript:>> wrote: > >> >> >> On Tuesday, May 24, 2016 at 3:37:42 AM UTC+3, Phillip M. Feldman wrote: >>> >>> I would like to perform operations on polynomials over GF(2), i.e., >>> polynomials with binary coefficients. Is there a way to do this with SymPy? >>> >>> There is a sympy.polys.galoistools module, but I haven't found any user >>> documentation for it >>> >> >> galoistools is the low lever implementation module that is not intended >> for direct use. The user interface is the >> same as with other polynomials. To define a polynomial ring R with >> generator (or 'unknown') x over GF(2) you write >> >> R, x = ring('x', GF(2)) >> >> Polynomials are then constructed in the usual way: p = x**2 + x , etc. >> and all the standard operations are valid. (Note: x is also a polynomial, >> not a Symbol.) >> >> -- >> You received this message because you are subscribed to a topic in the >> Google Groups "sympy" group. >> To unsubscribe from this topic, visit >> https://groups.google.com/d/topic/sympy/nVDoS5B7DXw/unsubscribe. >> To unsubscribe from this group and all its topics, send an email to >> [email protected] <javascript:>. >> To post to this group, send email to [email protected] <javascript:> >> . >> Visit this group at https://groups.google.com/group/sympy. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/sympy/7895ce42-a158-4682-8590-4208c16580a4%40googlegroups.com >> >> <https://groups.google.com/d/msgid/sympy/7895ce42-a158-4682-8590-4208c16580a4%40googlegroups.com?utm_medium=email&utm_source=footer> >> . >> >> For more options, visit https://groups.google.com/d/optout. >> > > -- You received this message because you are subscribed to the Google Groups "sympy" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/sympy. To view this discussion on the web visit https://groups.google.com/d/msgid/sympy/3ea0cce4-7a40-4602-9298-1a4f40d0a8b4%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
