David Joyner wrote:
> Since
>
> sage: x,y = var("x y")
> sage: plot3d(x^2-y^2, (x,-1,1),(y,-1,1))
>
> works fine, why not just use variables
>
> sage: f = x^2-y^2
> sage: f.variables()
> (x, y)
>
> to find the missing variables in plot3d(x^2-y^2, (-1,1),(-1,1))
> and then replace the arguments (-1,1),(-1,1) by
> (x,-1,1),(y,-1,1) in plot3d.parametric_plot3d?
Please use "f.arguments()" instead of "f.variables()". The difference
is illustrated below:
sage: var("x,y")
(x, y)
sage: f(x,y) = x
sage: f.variables()
(x,)
sage: f.arguments()
(x, y)
In this case, using "variables" won't work since only one thing is
passed back, but using arguments does work, since the function was
defined as taking two inputs.
Jason
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