[SciPy-user] 2D Interpolation
Sun Jun 29 14:30:51 CDT 2008
>> Jackpot! This works really well. There's a good example on using
>> it here:
>> Which is important, because I had to read the docstring a dozen
>> times to
>> understand what was going on. It should also be noted that while the
>> example interpolates to a regular grid, there's nothing precluding
>> interpolating to an irregular collection of points. What's weird is
>> that you need to manually scale the points to which you're
>> to be floating point indices within the original grid. This is
>> probably due to the ndimage-focused nature of map_coordinates.
>> Moving some of the functionality of map_coordinates, in a more generic
>> fashion, into scipy.interpolate wouldn't be the worst idea in the
>> Then again, I don't know if anyone else is planning on improving
>> scipy.interpolate to gain this functionality (interpolation to array
>> irregular set of points) in another way. (I also can't volunteer to
>> step up and do it at this time.)
> It looks like you were bitten by the same organizational problem that
> Shane mentions here (4th paragraph about where to find interpolation):
> Seems like we should address this both in the documentation and in the
> actual organization/location of the routines. Thoughts?
I think docs would be a good first step. Ndimage definitely wasn't an
area that I thought of, and even if I did look there, "map_coordinates"
is not a name I associate with interpolation. As far as a
reorganization is concerned, I think a refactoring is more likely what
is needed. Even though it manages to do what I need, it still feels
like I'm abusing the function a bit rather than it being a smooth
solution to my problem. I think what would be nice would be taking the
functionality available in map_coordinates and wrapping it with the
existing API's in scipy.interpolate (either OO-based or procedural).
Obviously, this is a bit of work, and since I don't have the time ATM, I
can't push too hard here. :)
I think a good interim solution would to at least add a see also link to
map_coordinates from some of the relevant scipy.interpolate docstrings.
I think cleaning up the map_coordinates docstring and maybe adding
some better examples would also help.
Graduate Research Assistant
School of Meteorology
University of Oklahoma
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