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Re: 3D congrid without interpolation [message #53425 is a reply to message #53411]

Fri, 13 April 2007 08:21

Mike[2]
Messages: 99
Registered: December 2005

Member

On Apr 12, 6:40 pm, "mgal...@gmail.com" <mgal...@gmail.com> wrote:
> CONGRID interpolates 3-dimensional arrays by default.

If you are really looking for a method that requires no interpolation,
you will have to choose your new array to overlap a subset of the
array indexes of the original data. I suspect you might really be
thinking about nearest neighbor interpolation. If so, you can do that
by

1 - calculating the [x,y,z] coordinates at which I want to evaluate my
data.

2 - round the coordinates

3 - interpolate a new array with interpolate(data,x,y,z)

This can be a memory hog for large arrays since you need 4 arrays for
each point in the new array. In the case where this leads to lots of
swapping, I usually do it slice by slice.

Mike

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[Message index]

		Re: 3D congrid without interpolation By: James Kuyper on Sat, 14 April 2007 10:59
		Re: 3D congrid without interpolation By: JD Smith on Fri, 13 April 2007 18:00
		Re: 3D congrid without interpolation By: David Fanning on Fri, 13 April 2007 17:33
		Re: 3D congrid without interpolation By: JD Smith on Fri, 13 April 2007 15:57
		Re: 3D congrid without interpolation By: Mike[2] on Fri, 13 April 2007 08:21
		Re: 3D congrid without interpolation By: Qing on Thu, 12 April 2007 19:45
		Re: 3D congrid without interpolation By: David Fanning on Thu, 12 April 2007 17:30
		Re: 3D congrid without interpolation By: Michael Galloy on Thu, 12 April 2007 15:40
		Re: 3D congrid without interpolation By: David Fanning on Thu, 12 April 2007 14:19
		Re: 3D congrid without interpolation By: mxhamidi on Mon, 16 April 2007 11:43
		Re: 3D congrid without interpolation By: JD Smith on Mon, 23 April 2007 09:53

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