On Sat, Oct 23, 2010 at 1:41 PM, Ryan dale <dal...@niddk.nih.gov> wrote:
> Here's a problem that's been driving me nuts, and I finally reduced it
> to a small self-contained script which can be found at
> http://gist.github.com/642538. The issue is that the pick_event does
> not always provide the correct index into the plotted data.
>
> In case this script only bugs out on my machine, let me describe the
> problem. The callback should highlight whatever point is clicked. This
> happens correctly with no problems when clicking on 9 out of the 10
> points in the figure. But clicking the indicated point on the left-hand
> side (x[9], y[9]) also causes the indicated point on the top right
> (x[6], y[6]) to be highlighted as well.
>
> Frustratingly, it seems that the numbers themselves are important for
> reproducing this bug! Specifically, x[9]+=0.01 does not "fix" the bug .
> . . but x[9] += 0.1 makes the callback work correctly (i.e. only the
> clicked point is highlighted). I'm guessing this is some sort of
> tolerance issue somewhere, but I can't find it.
>
> possibly-relevant info:
>
> matplotlib 1.0.0
> numpy 1.3.0
> Ubuntu 10.04 64bit
>
> thanks,
> -ryan
>
>
Very strange. Careful analysis using your script shows that with a slightly
smaller picker size (4), I was able to click on the troublesome point and
have it return *only* the other point, while clicking in a slightly
different spot gets me only the desired point. At one point, I set picker
to 1, and I was able to get another point to occasionally cause problems
(but not the original ones).
Very strange...
Ben Root
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