Ironically, I did something just like this at a talk this week. But I used something like
lambda x,y: abs(zeta(x+i*y)) (actually not that, but I hope that will work). At least one of these should really be implemented as complexplot3d or something like that. Does that seem like a useful function to have around? - kcrisman On May 30, 9:13 pm, littlemathteacher <[email protected]> wrote: > Thanks a lot. Much simpler than I thought it would be. Very fine > instructive example. > Yours, littlemathteacher. > > On 30 Mai, 17:49, Jason Grout <[email protected]> wrote: > > > littlemathteacher wrote: > > > Dear Supporters, > > > > first of all thanks to you all for doing such a great support job to > > > me so far. > > > > Now I want to make complex analysis visible and to plot 3d-graphics > > > either of real or imaginary parts of functions. > > > > The first step would be to plot the exponential function just like in > > > the german or the us wikipedia article, later to show the branch cuts > > > like in > > > >http://mathworld.wolfram.com/BranchCut.html > > > > or the gamma function like in > > > >http://mathworld.wolfram.com/GammaFunction.html. > > > > The reason why my attemps fail might lie somwhere in the defining of > > > variables and in the picking out of the real or the imaginary part. > > > > I guess all I need is one working example of how to 3dplot let's say > > > complexplane X real part of the function value. > > > > Starting from that example I could do the rest myself, but I didn't > > > find one yet. > > > > Could you please post a link to an example? > > > And here's the imaginary part: > > > sage: plot3d(lambda x,y: arcsin(x+y*I).imag(), (-2,2), (-2,2)) > > > Jason > > -- > > Jason Grout --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~----------~----~----~----~------~----~------~--~---
