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interpolate weirdness [message #87659]

Fri, 21 February 2014 04:00

rogass
Messages: 200
Registered: April 2008

Senior Member

Hi Folks,

I know that there is no 'correct' way for interpolation, but maybe a 'best' IDL way. The following example easily demonstrates what I mean:

IDL> d=dist(20) & print,interpolate(d,[.5],[.5],/grid)
0.853553

IDL> print,interpolate(d,[.5],[.5],/grid,/cubic)
0.622236

IDL> print,interpolate(d,[.400544],[.400544],/grid)
0.707107

IDL> print,interpolate(d,[.581946],[.581946],/grid,/cubic)
0.707107

IDL> print,'The result should be: ',sqrt(.5)
The result should be: 0.707107

It does not play a role which IDL version is used - for IDL 6.4 and for IDL 8.3 I got the same results. Is there any way to get 'closer' to a reasonable result?

Thanks and Cheers

Chris

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[Message index]

		interpolate weirdness By: rogass on Fri, 21 February 2014 04:00
		Re: interpolate weirdness By: Helder Marchetto on Fri, 21 February 2014 04:33
		Re: interpolate weirdness By: Helder Marchetto on Fri, 21 February 2014 05:59
		Re: interpolate weirdness By: Helder Marchetto on Fri, 21 February 2014 06:06
		Re: interpolate weirdness By: rogass on Fri, 28 February 2014 08:31

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