Thanks Michael. I am plotting it now, and it is just waiting without giving a crash. Is it automatically right to use complex_plot command to plot the imaginary part of the same plot as given below?
onsdag 28. desember 2016 16.58.00 UTC+1 skrev Michael Orlitzky følgende: > > On 12/28/2016 10:33 AM, Fjordforsk A/S wrote: > > This is how its supposed to go: > > > > sage: plot3d(((1 - (3/8 - 3*t^2 - 2*t^4 - 9*x^2 - 10*x^4 - 12*t^2*x^2) + > > i*x*(15/4 + 6*t^2 - 4*t^2 - 2*x^2 - 4*x^4 + 8*t^2*x^2))/(1/8*(3/4 + > 9*t^2 + > > 4*t^2+ 16/3*t^6 + 33*x^2 + 36*x^24 + 16/3*x^6)))*e^(i*x)), (x, -2, 2), > (t, > > -2, 2) > > > > > > However, Sage thinks that 3*t^2 = Integer(3)*t****Integer(2) > > > > That is , twice multiplied with 2, and not exponent to two. > > The double-star means exponentiation in both python and in sage: > > sage: 2^8 > 256 > sage: 2**8 > 256 > > But beware, the carat "^" has a special meaning in sage. In python, it > does something else entirely: > > >>> 2^8 > 10 > > In any case, your problem is elsewhere... I think you've got an extra > parenthesis at the end of your expression. Instead of "e^(i*x))", you > should have "e^(i*x)". Then you'll need another parenthesis at the end > of the whole thing. > > After that, well, at least you get a different error =) > > It crashes for me because it's trying to plot a point with a non-zero > imaginary part. It could be that the imaginary part is tiny -- in which > case you can throw it away -- or else you might have to rearrange your > expression, or break up the domain. > > -- 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.
