[Numpy-discussion] floating point arithmetic issue
Fri Jul 30 11:15:08 CDT 2010
Guillaume Chérel wrote:
> As for the details about my problem, I'm trying to compute the total
> surface of overlapping disks. I approximate the surface with a grid and
> count how many points of the grid fall into at least one disk.
That is a highly approximate way to do it - which may be fine, but I
doubt any floating point errors you get are going to make it worse.
> if you
> know of another good way to compute the surface of overlapping disks,
> I'd be glad to know.
Are these "disks" exactly round? If so -- use coordinate geometry to
calculate it exactly (or as exactly as floating point allows ;-) )
I just googled: "area of intersecting circles"
And got a bunch of hits.
Christopher Barker, Ph.D.
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