Thank you so much, It was so helpful. On Monday, April 29, 2013 11:46:22 PM UTC+4:30, Simon King wrote: > > Hi Neda, > > On 2013-04-29, Neda <neda.d...@gmail.com <javascript:>> wrote: > > I want to compute S(f,g) , but this command doesn't work and it said > there > > is no spol command, could you please tell me how can I compute it? > > R.<x,y,z>=PolynomialRing(QQ,3,'lex') > > f=4*x^2*z-7*y^2 > > g=x*y*z^2+3*x*z^4 > > spol(f,g) > > spol is a function defined in the module > sage.rings.polynomial.toy_buchberger. > > Of course, most functions defined in Sage are not imported into the > global namespace when you start the program---otherwise, it would > be a total mess. > > So, you need to import the function first: > sage: from sage.rings.polynomial.toy_buchberger import spol > sage: R.<x,y,z>=PolynomialRing(QQ,3,'lex') > sage: f=4*x^2*z-7*y^2 > sage: g=x*y*z^2+3*x*z^4 > sage: spol(f,g) > -1/3*x^2*y*z^2 - 7/4*y^2*z^3 > > Note that the functions in toy_buchberger are not intended for an > efficient computation of Gröbner bases---that's why it is called > "toy". The purpose is educational. > > Best regards, > Simon > >
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