On Mar 23, 3:31 pm, John H Palmieri <jhpalmier...@gmail.com> wrote:
> On Mar 23, 3:10 pm, Jose Guzman <n...@neurohost.org> wrote:
>
>
>
>
>
> > Dear Sage users and developers,
>
> > I am using Sage version 3.4 running on Linux/Debian. I am still not very
> > familiar with Sage though. I tried to plot the following equation:
>
> > sage: var('t'); # symbolic variable
> > sage: var('g'); # symbolic variable
> > sage: f(t) = g*(t**2-1)/(2*(t-1)) # try to simplify this function later...
>
> > Obviously the function is not defined at t=1. Returns (0/0)
>
> > sage: f(1).subs(g=9.81) # returns Division by 0
>
> > The problem comes when I try to plot the whole function f(t). By default
> > the plot is between -1 and +1.
>
> > sage: fig = plot(f.subs(g=9.81))
This is why you are getting a plot between -1 and 1: the plot command
expects xmin and xmax arguments, and if you don't specify any, it uses
xmin=-1 and xmax=1. From this point on, fig goes from -1 to 1, and
specifying different end points in show (for example) doesn't affect
the actual plot in fig.
By the way, if you type
sage: plot(f.subs(g=9.81), 0, 10)
then the plot will be displayed -- you don't need to save the plot and
then 'show' it.
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