Thanks for the matplotlib recipe! I just had the same problem with plot_vector_field not accepting coordinate functions of two arguments. I went ahead and created an issue: http://trac.sagemath.org/sage_trac/ticket/2381
- Eric On Feb 17, 10:19 am, "Hector Villafuerte" <[EMAIL PROTECTED]> wrote: > Hi, > I would like to plot the gradient (i.e. vector field) of functions > such as f(x,y) = exp(-(x^2 + y^2)); in this case: > grad(f(x,y)) = vector([ -2*x*exp(-(x^2 + y^2)), -2*y*exp(-(x^2 + y^2)) ]) > > Initially I tried with plot_vector_field, but as of now it just "takes > two functions of one variable". For my second attempt I used > matplotlib, as indicated below (also, see attached plots). > > So my question: is there a SAGEly way to plot this type of vector fields? > Thanks in advance! > -- > Hector > > sage: %python > sage: from pylab import * > sage: X,Y = meshgrid( arange(-2,2,.2),arange(-2,2,.2) ) > sage: U = -2*X*exp(-(X*X + Y*Y)) > sage: V = -2*Y*exp(-(X*X + Y*Y)) > sage: figure() > sage: Q = quiver( U, V) > sage: l,r,b,t = axis() > sage: dx, dy = r-l, t-b > sage: axis([l-0.05*dx, r+0.05*dx, b-0.05*dy, t+0.05*dy]) > sage: savefig(DATA+'quiver.png') > > quiver.png > 96KViewDownload > > 3d.png > 1020KViewDownload --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to sage-support@googlegroups.com 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 -~----------~----~----~----~------~----~------~--~---
