That definitely looks like a bug. It seems to be in the fast_float
command, called by setup_for_eval_on_grid. Hopefully someone more
familiar with fast_float can comment on what is going wrong.
-M.Hampton
On Dec 31 2009, 5:30 pm, TianWei <ltwis...@gmail.com> wrote:
> When I try the following:
>
> sage: x,y = var('x,y')
> sage: region_plot(1/x + 1/y > 1/x * 1/y, (x,-10,10), (y,-10,10)).show
> ()
>
> I get an error (the last line of the Traceback is reproduced below):
>
> TypeError: reduce() of empty sequence with no initial value
>
> This error occurs in both the notebook and at the Sage prompt. I found
> this in versions 4.1.2 to 4.3, but I don't know about the versions
> before 4.1.2.
>
> Interestingly, the following commands work:
>
> sage: region_plot(1/x + 1/y < 1/x * 1/y, (x,-10,10), (y,-10,10)).show
> () # '>' changed to '<'
> sage: implicit_plot(1/x + 1/y == 1/x * 1/y, (x,-10,10),
> (y,-10,10)).show()
>
> I'm not very proficient at using Sage, so I appreciate any ideas and
> advice.
>
> Tianwei
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