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Interpol asymmetric? [message #80271]

Thu, 24 May 2012 16:01

Christian
Messages: 11
Registered: March 2012

Junior Member

I've traced some problems to an unlikely source... For me, INTERPOL
does not always work symmetrically when using the quadratic setting!
(ie - the reverse of the output from reversed input is not the same as
the regular output). From the definition of what it's (supposed to be)
doing in the documentation it seems that it should.

For example, if I enter:
test = [0,1,2,3,4,5,5,4,3,2,1,0]
plot, interpol(test,100,/quad), psym=5
oplot, interpol(test,100)

I find that the peak produced by /quad is lopsided, with an extra
bulge on the right hand side. This is using IDL 7.0. Presumably
other people experience the same phenomena? I couldn't find any
reference to this on the web - is this a known problem or maybe I
misread the documentation? Any workaround? I would prefer to get
what the left-hand side of this simple example looks like, but on both
sides...

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[Message index]

		Interpol asymmetric? By: Christian on Thu, 24 May 2012 16:01
		Re: Interpol asymmetric? By: Kenneth P. Bowman on Fri, 25 May 2012 10:52

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