[AstroPy] point in ellipse

gonghang.naoc ghang.naoc@gmail....
Thu Jan 31 07:49:11 CST 2013


Thank you.oh, I thought a graphic way might be more convenient than a
mathematical way .I am lazy to calculate..
Hang

On Thu, Jan 31, 2013 at 2:48 AM, Perry Greenfield <perry@stsci.edu> wrote:

> Sure.
>
> But I'm assuming you wanted more than that. I presume you are looking for
> a function to test if a coordinate (or array of coordinates) lies inside
> the ellipse or not. Yes, that can be done analytically. You want a python
> function that does that specifically? (No, I don't have one handy, but it
> shouldn't be hard to code).
>
> Perry
>
> On Jan 30, 2013, at 1:33 PM, gonghang.naoc wrote:
>
> > hi,everybody,
> >      I believe many people here use ds9 and know  its region file
> format.For example,we can make an ellipse if we know its center ra,dec and
> main aixs direction.Is there a pythonic way to judge whether a point is in
> an ellipse if we know ra&dec of the point?
> >      Thank you.
> >      Best wishes.
> >      Hang
> >       _______________________________________________
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> > AstroPy@scipy.org
> > http://mail.scipy.org/mailman/listinfo/astropy
>
>
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