Sorry, I should have noted that everything I did here was on sagenb.com using firefox running on Xubuntu 9.04
On May 6, 12:28 pm, Alden <alden.wal...@gmail.com> wrote: > 0) > sagenb.com is awesome, especially since Mathematica 7 takes up 100% of > my processor at all times under Ubuntu 9.04. > > 1) > When I run: > parametric_plot( (cos(t), sqrt(2)*sin(t)) , (t,0,2*pi)) > I get a nice 2d parametric plot, with the top of the ellipse clearly > hitting close to 1.5 on the y-axis. When I run: > parametric_plot3d( (cos(t), 1 , sqrt(2)*sin(t)), (t,0,2*pi)) > The top of the ellipse really looks like it's at z=1, and the whole > thing looks a lot like a circle. I realize that this is probably not a > problem with sage and rather with whatever is doing the plotting, but > I thought I should point it out. > > 2) > Also, after clicking and dragging on the 3d plot, I can't type > anywhere in firefox (the notebook or the address bar) until I click > onto another tab and then back again. This may be a problem with java > in my browser not taking the keyboard away from the applet. > > 3-more of a feature request than an error I guess) > I have noticed from googling that there has been some discussion about > creating a function from R^n to R^m. I am sure there is some good > reason why this isn't the case, but I was curious about whether it > would be possible to just automatically map everything over tuples of > symbolic expressions, or make a tuple of symbolic expressions a > symbolic expression itself. For example, why couldn't diff( (t, 2*t), > t) (which gives the error that a tuple is not a symbolic expression) > notice that the tuple is a tuple of symbolic expressions, and then > just map itself over it to get (1,2). Also, then defining f(x,y) = > (2*x, 2*y) seems like it would work. Similarly, what if there was a > dot product function which just did the obvious thing when it was > given two tuples of symbolic expressions? The reason that I am > thinking about this is that it would be really awesome if I could tell > my vector calculus class to do a line integral by defining what f(c(t)) > =fc(t) and c(t) are and then just: > integrate( dot( fc(t), diff( c(t), t), t, 0, 2*pi) > rather than something like > integrate( vector( (t,t^2,t^3) ).dot_product( diff( vector( (t,t,t) ), > t ) ), t,0,2*pi) > which is a little less intuitive. > > -Alden --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~----------~----~----~----~------~----~------~--~---
