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Re: interpolation question [message #48394 is a reply to message #25895] Thu, 20 April 2006 01:20 Go to previous messageGo to previous message
peter.albert@gmx.de is currently offline  peter.albert@gmx.de
Messages: 108
Registered: July 2005
Senior Member
Hi Chen,

I haven't tested this extensively, but I would try

nn = y[round(interpol(indgen(n_elements(x)),x, u))]

where "x" and "y" are the, well, x and y values and "u" is the vector
with x-values for which the nearest neighbours are to be found.

What goes on?

The interpol command interpolates the indices of the x and y vectors to
the new locations, round actually finds the nearest neighbour in terms
of index, and then we just assign y with those indices.

Regards,

Peter

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