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interpolation question [message #48395]

Wed, 19 April 2006 21:25

chen123.dian
Messages: 4
Registered: April 2006

Junior Member

Hi, I want to use nearest-neighbor method to interpolate 2-D data.
After reading some posters here and idl references, I am still confused
how to do. I use a 1-D data to explain my problem. For example, there
is x-arrary, [1.0, 2.9, 5.1], the corresponding y-arrary is [10, 50,
80]. Now we want to get the y-values at x-value [0.5, 2.6, 3.1, 4.6]
using nearest-neighbor method. The result of y-values should be [10,
50, 50, 80]. Can the IDL function of interpolate.pro do this work? The
input of interpolate.pro, X,Y,Z, arrays of numeric type containing the
locations for which interpolated are desired, is very confuse. Is there
any function like the function interp1 (interp2 for 2-D data) for
matlab? Like, y_values=interp1(x, y, x-values, 'nearest', 'extrap').

Thanks in advance.

Chen

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[Message index]

		interpolation question By: chen123.dian on Wed, 19 April 2006 21:25
		Re: interpolation question By: JD Smith on Thu, 20 April 2006 18:57

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