Use simplify() Aaron Meurer
On Fri, Oct 24, 2014 at 6:54 AM, redstone-cold <redstone-c...@163.com> wrote: > > Is there any way to simplify (-12*x - 1)*(2*x3 + 3*x2 - 2*x - 5) + (-6*x2 - > x - 7)*(6*x2 + 6*x - 2) ？ I want to get the final result ,not an > intermediate one. > > > > > > At 2014-10-17 22:27:44, "Chris Smith" <smi...@gmail.com> wrote: > > The parser was fixed as indicated at > http://stackoverflow.com/questions/26249993/6x2-x-72x33x2-2x-5-as-input-in-sympy > >>>> from sympy.parsing.mathematica import mathematica as m >>>> m('(-6 * x**2 - x - 7) * (2 * x**3 + 3 * x**2 - 2 * x - 5)') > (-6*x**2 - x - 7)*(2*x**3 + 3*x**2 - 2*x - 5) >>>> _.diff(x) > (-12*x - 1)*(2*x**3 + 3*x**2 - 2*x - 5) + (-6*x**2 - x - 7)*(6*x**2 + 6*x - > 2) > > > > On Wednesday, October 8, 2014 8:42:16 AM UTC-5, Mateusz Paprocki wrote: >> >> Hi, >> >> On 8 October 2014 12:05, <redsto...@163.com> wrote: >> > Is there any function in SymPy can take this TEX command as an input >> > >> > (-6x^2-x-7)(2x^3+3x^2-2x-5) >> > >> > to find the derivative? >> >> I wanted to suggest a mathematica parser for this: >> >> In [1]: import sympy.parsing.mathematica as m >> >> In [2]: m.parse("(-6x^2-x-7)(2x^3+3x^2-2x-5)") >> Out[2]: '(-6*x**2-x-7)*(2*x**3+3*x**2-2*x-5)' >> >> In [3]: eval(_) >> Out[3]: >> ⎛ 2 ⎞ ⎛ 3 2 ⎞ >> ⎝- 6⋅x - x - 7⎠⋅⎝2⋅x + 3⋅x - 2⋅x - 5⎠ >> >> But there is bug there and the above output requires the following patch: >> >> diff --git a/sympy/parsing/mathematica.py b/sympy/parsing/mathematica.py >> index f86d59a..eeb12f7 100644 >> --- a/sympy/parsing/mathematica.py >> +++ b/sympy/parsing/mathematica.py >> @@ -39,7 +39,7 @@ def parse(s): >> (r"\A\((.+)\)([\w\.].*)\Z", # Implied multiplication - (a)b >> lambda m: "(" + parse(m.group(1)) + ")*" + parse(m.group(2))), >> >> - (r"\A([\d\.]+)([a-zA-Z].*)\Z", # Implied multiplicatin - 2a >> + (r"\A([+-]?[\d\.]+)([a-zA-Z].*)\Z", # Implied multiplicatin - 2a >> lambda m: parse(m.group(1)) + "*" + parse(m.group(2))), >> >> (r"\A([^=]+)([\^\-\*/\+=]=?)(.+)\Z", # Infix operator >> >> Mateusz >> >> > -- >> > 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 sympy+un...@googlegroups.com. >> > To post to this group, send email to sy...@googlegroups.com. >> > Visit this group at http://groups.google.com/group/sympy. >> > To view this discussion on the web visit >> > >> > https://groups.google.com/d/msgid/sympy/04e0cbd4-5b6b-4418-8166-024a0729aff8%40googlegroups.com. >> > For more options, visit https://groups.google.com/d/optout. > > -- > 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/RoJ_o598B7Q/unsubscribe. > To unsubscribe from this group and all its topics, send an email to > sympy+unsubscr...@googlegroups.com. > To post to this group, send email to sympy@googlegroups.com. > Visit this group at http://groups.google.com/group/sympy. > To view this discussion on the web visit > https://groups.google.com/d/msgid/sympy/94765cae-9366-4e3c-a64c-d7694104f038%40googlegroups.com. > 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 sympy+unsubscr...@googlegroups.com. > To post to this group, send email to sympy@googlegroups.com. > Visit this group at http://groups.google.com/group/sympy. > To view this discussion on the web visit > https://groups.google.com/d/msgid/sympy/5f2010a.1ee40.149420210e4.Coremail.redstone-cold%40163.com. > > 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 sympy+unsubscr...@googlegroups.com. To post to this group, send email to sympy@googlegroups.com. Visit this group at http://groups.google.com/group/sympy. To view this discussion on the web visit https://groups.google.com/d/msgid/sympy/CAKgW%3D6J%2B-FXALezjyDqMALSpv09d%2Bn4mq%3DWWzF3nCRQeFi_r_Q%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
