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Re: Minimum and location of minimum through interpolation [message #79066]

Mon, 30 January 2012 07:26

Craig Markwardt
Messages: 1869
Registered: November 1996

Senior Member

On Jan 30, 3:33 am, Els <elias.rous...@gmail.com> wrote:
> Here is where the problem are:
>
> Due to undersampling, the actual minimum standard deviation may occur between two x-values, so I want to determine this through interpolation. That is not so difficult, but one additional problem is that "x" is an angle, so I can have jumps from 360 deg to 0 deg. If the mimimum is around eg. 358 deg and I have undersampling, interpolation may give me a result of ~180 deg, which is obviously wrong.

You could try unwrapping your series first, for example by using
PHUNWRAP, and then doing your minimum-finding procedure with the
modified series.

Craig

http://www.physics.wisc.edu/~craigm/idl/math.html#PHUNWRAP

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		Re: Minimum and location of minimum through interpolation By: Craig Markwardt on Mon, 30 January 2012 07:26
		Re: Minimum and location of minimum through interpolation By: Russell[1] on Mon, 30 January 2012 13:18

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