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Finding the closest value in an array... [message #38780]

Tue, 30 March 2004 01:34

timrobishaw
Messages: 16
Registered: June 2003

Junior Member

Hi there.

Seems like every few minutes I'm taking a scalar and trying to locate
which value in an array it's closest to. VALUE_LOCATE() finds the
interval of a monotonic vector that the value lives in, so it's not
quite what I'm looking for, but it's awfully close! I end up just
doing this:

IDL> useless = min(abs(vector-value),minindx)
IDL> closest = vector[minindx]

I'm embarrassed to admit I don't know of any other way to do this. Is
there some slick way like VALUE_LOCATE() to do this? I find it
aesthetically unpleasant to have to set something to a useless value
just to get at the corresponding index; however, I can't see any way
to be clever about it. And it's pretty much to the point: I'd bet
VALUE_LOCATE() is doing a lot more stuff behind the scenes than the
simple two lines above (judging from the old Goddard library routine).

I guess I'm surprised that I haven't found some canned routine for
this (like in the Goddard library) given that I usually need to find
closest values more often than intervals in which a value lives.
-Tim.

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[Message index]

		Finding the closest value in an array... By: timrobishaw on Tue, 30 March 2004 01:34
		Re: Finding the closest value in an array... By: JD Smith on Wed, 31 March 2004 10:07

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