#12881: Allow plotting zero width interval
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Reporter: kcrisman | Owner: jason, was
Type: enhancement | Status: new
Priority: minor | Milestone: sage-5.1
Component: graphics | Resolution:
Keywords: | Work issues:
Report Upstream: N/A | Reviewers:
Authors: | Merged in:
Dependencies: | Stopgaps:
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Changes (by kcrisman):
* type: defect => enhancement
Old description:
> {{{
> plot(x,x,0,0)
>
> Traceback (click to the left of this block for traceback)
> ...
> ZeroDivisionError: float division
> }}}
> Maybe this should be an error, but it should be an ''informative'' error.
New description:
{{{
plot(x,x,0,0)
Traceback (click to the left of this block for traceback)
...
ValueError: plot start point and end point must be different
}}}
Maybe this shouldn't be an error, but instead give an empty plot or a
point? See below for discussion.
--
Comment:
Oh, and this is clearly a dup '''and''' invalid as it stands, because I
was using our old campus server. Nice!
But I'm going to change this. I wonder if this maybe shouldn't give rise
to an empty graphic, or maybe just a point. The reason is that in the
wild, one can't always predict what one will want. As an example:
{{{
var('y')
@interact
def _(t = [pi/6*n for n in [1..18]]):
P = plot(1/2*sin(y),(x,0,t),fill=True,tick_formatter=pi,ticks=pi/6)
Q = plot(1/2*sin(y),(x,0,3*pi),tick_formatter=pi,ticks=pi/6)
show(P+Q)
html("The integral up to $y=%s$ is $\\approx
%s$."%(latex(t),latex(integral(1/2*sin(y),y,0,t).n())))
}}}
I would really ''like'' to have it be from `[0..18]`, since I already have
a plot and it would be nice to have this work since integration from 0 to
0 works - but this error stands in the way.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/12881#comment:3>
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