[sage-support] Re: Endomorphism Rings of Elliptic Curves
On Tuesday, January 21, 2020 at 5:23:43 PM UTC-8, Eric Zhu wrote: > > Is there a way to get the endomorphism ring of an elliptic curve in Sage? > with d=E.cm_discriminant() you know that End(E) is the cm order of discriminant d. If E does not have cm, then End(E)=Z -- 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 view this discussion on the web visit https://groups.google.com/d/msgid/sage-support/c9656d31-3e4b-4f9f-a783-5d0d25f92717%40googlegroups.com.
[sage-support] Parallelization of contractions
How to use parallelization on contraction of tensor? Consider the case I have two successive contraction like this: Tud=etuu['^{ab}']*eamup['^c_b'] Tp=Tud['^{ab}']*eamup['^c_a'] How con I parallelize it? -- 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 view this discussion on the web visit https://groups.google.com/d/msgid/sage-support/598665a5-e941-45c8-b031-77f66877e4f9%40googlegroups.com.
[sage-support] Endomorphism Rings of Elliptic Curves
Is there a way to get the endomorphism ring of an elliptic curve in Sage? -- 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 view this discussion on the web visit https://groups.google.com/d/msgid/sage-support/ff46239b-4e71-4286-9e84-cda7db4641c4%40googlegroups.com.
Re: [sage-support] sage 9.0: numerical_integral of unit_step()
On Tue, Jan 21, 2020 at 1:00 PM mendes wrote: > > Dear all, > > In previous versions of Sage I was able to do very quickly some numerical > integrations involving unit_step(t) function . > > But, in the last updates (8.9 and 9.0) , it takes 6 times longer to do the > numerical integral of convolution with unit_step(), than to do the same > operation with a gaussian function. > > It does not seem to be o.k., comparing the simplicity of unit_step() with > the gaussian $e^{-t^2}$. > > #Compare: > > var('x,t') > f= e^(-(t-1)^2) > g= sin(t) > fg= lambda t: numerical_integral(f(t=x)*g(t=t-x),0,t,params=[0])[0] > plot(fg,t,0,3) > > > #with: > > var('x,t') > f= unit_step(t-1) > g= sin(t) > fg= lambda t: numerical_integral(f(t=x)*g(t=t-x),0,t,params=[0])[0] > plot(fg,t,0,3) > > > Thanks for your attention. yes, in my tests it's even worse than 6 times slower. Open a trac ticket? > > -- > 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 view this discussion on the web visit > https://groups.google.com/d/msgid/sage-support/20eca99f-2e3f-4dfe-b258-d2fc7d28b0e5%40googlegroups.com. -- 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 view this discussion on the web visit https://groups.google.com/d/msgid/sage-support/CAAWYfq3BL6aRMnj0H94UVApH8jzPu7fotgjXfv2fCMe%2BZaFq7Q%40mail.gmail.com.
[sage-support] sage 9.0: numerical_integral of unit_step()
Dear all, In previous versions of Sage I was able to do very quickly some * numerical* integrations involving unit_step(t) function . But, in the last updates (8.9 and 9.0) , it takes 6 times longer to do the numerical integral of convolution with unit_step(), than to do the same operation with a gaussian function. It does not seem to be o.k., comparing the simplicity of unit_step() with the gaussian $e^{-t^2}$. #Compare: var('x,t') f= e^(-(t-1)^2) g= sin(t) fg= lambda t: numerical_integral(f(t=x)*g(t=t-x),0,t,params=[0])[0] plot(fg,t,0,3) #with: var('x,t') f= unit_step(t-1) g= sin(t) fg= lambda t: numerical_integral(f(t=x)*g(t=t-x),0,t,params=[0])[0] plot(fg,t,0,3) Thanks for your attention. -- 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 view this discussion on the web visit https://groups.google.com/d/msgid/sage-support/20eca99f-2e3f-4dfe-b258-d2fc7d28b0e5%40googlegroups.com.