Not wanting to suggest I am the expert on this, I would conjecture that splitting the plot in two parts is the right way to do it. The reason why I think that is because it seems reasonable to me that plot cleverly concatenates lots of line plots. If true, it is the interpolation of the point (-1,f(-1 - 0)) and (-1,f(-1 + 0)) which creates the vertical line.
Another method should be to create a 2 part piecewise-defined function (equal to f on (-4,-1) and on (-1,4)) and plot that. However, there seem to be some bugs in the plotting procedure of piecewise defined functions, so that won't work until I get time to fix the bugs. On 2/10/07, Joel B. Mohler <[EMAIL PROTECTED]> wrote: > > On Saturday 10 February 2007 10:20, David Joyner wrote: > > Is this what you want? > > > > sage: f = lambda x:1/x > > sage: p = plot(f(x),-4,4) > > sage: show(p,xmin=-4,xmax=4,ymin=-4,ymax=4) > > Hmm, now I feel stupid ... I shouldn't have read the documentation. Neither > the "show??" or "plot??" documentation are very clear on that (or a whole > bunch of other things). > > Thanks. > > And another plotting question: > sage: f = lambda x:1/(x+1) > sage: p=plot(f,-4,4) > sage: show(p,xmin=-4,xmax=4,ymin=-4,ymax=4) > produces a vertical line at x=-1 for the discontinuity. Is there a way to > suppress that? After reading the reference manual, I see that I could add a > plot to the left of -1 to a plot to the right of -1. Is there a better way? > > -- > Joel > > > > --~--~---------~--~----~------------~-------~--~----~ 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://sage.math.washington.edu/sage/ and http://sage.scipy.org/sage/ -~----------~----~----~----~------~----~------~--~---
