I'm using a Ubuntu 18.04.1 LTS, currently with Xfce4, but also Lxde, on a Dell G7 with i7-8750H cpu and 16 gb of ram, and I built Sage version 8.3 from source.
The text I'm working from say that I should get this result: sage: p.collect(x).collect(y) sage: 2*b*y*x^2 + 2*b*y^3−(a*x−z−1)*x^2−(a*x−z−1)*y^2 Am I missing something? Is this output correct? Am I misusing the collect() function? Thanks for your time. On Sunday, August 19, 2018 at 3:53:51 AM UTC-7, rob.w...@gmail.com wrote: > > Hi. > I'm using this polynomial: > > p = z*x^2 + x^2 − (x^2 + y^2 )*(a*x − 2*b*y) + z*y^2 + y^2 > > and when I issue this command: > > p.collect(x).collect(y) > > to Sage 8.3 in the terminal, I get this response: > > -a*x^3 + 2*b*x^2*y + 2*b*y^3 - (a*x - z - 1)*y^2 + x^2*z + x^2 > > Notice that only y is collected. > Here is the results from p.collect(x): > > -a*x^3 - a*x*y^2 + 2*b*y^3 + (2*b*y + z + 1)*x^2 + y^2*z + y^2 > > X is collected OK. > Here's p.collect(y) > > -a*x^3 + 2*b*x^2*y + 2*b*y^3 - (a*x - z - 1)*y^2 + x^2*z + x^2 > > Y is collected OK. > But put them both together p.collect(x).collect(y): > > -a*x^3 + 2*b*x^2*y + 2*b*y^3 - (a*x - z - 1)*y^2 + x^2*z + x^2 > > And only y is collected! > > Would you please tell me how to fix this? > > Thank you. > -- You received this message because you are subscribed to the Google Groups "sage-support" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-support+unsubscr...@googlegroups.com. To post to this group, send email to sage-support@googlegroups.com. Visit this group at https://groups.google.com/group/sage-support. For more options, visit https://groups.google.com/d/optout.
