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Re: Need help with value_locate and interpolation [message #38949 is a reply to message #38948]

Fri, 02 April 2004 09:20

Wayne Landsman
Messages: 117
Registered: January 1997

Senior Member

Leslie Welser wrote:
> I'm having some trouble with using the value_locate function. Let's
> say I have a vector with 10 elements, and I want to find the
> "interpolated" array index for a particular value. I know how to
> interpolate the vector, but I can't find a way to return the index as
> a float and not an integer. In other words, given a certain value of
> the array, I would like to find a way to return the information that
> that interpolated value is at an index of, say, 4.27. Is there a
> simple way to do this?

You might look at the function tabinv.pro at
ftp://idlastro.gsfc.nasa.gov/pub/pro/math/tabinv.pro

which first uses VALUE_LOCATE to find the two integer indicies which
bracket the supplied value, and then linear interpolates between the two
indicies to return a floating point value.

--Wayne Landsman

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[Message index]

		Re: Need help with value_locate and interpolation By: Yunxiang Zhang on Fri, 02 April 2004 14:42
		Re: Need help with value_locate and interpolation By: James Kuyper on Fri, 02 April 2004 09:21
		Re: Need help with value_locate and interpolation By: Wayne Landsman on Fri, 02 April 2004 09:20
		Re: Need help with value_locate and interpolation By: JD Smith on Fri, 02 April 2004 09:06
		Re: Need help with value_locate and interpolation By: btt on Fri, 02 April 2004 09:00

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