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Smooth and /EDGE_TRUNCATE [message #88457]

Tue, 29 April 2014 07:35

Fabzi
Messages: 305
Registered: July 2010

Senior Member

IDLers,

I've lost 3 hours of my life on this. Can someone explain me why the
/EDGE_TRUNCATE keyword has an incidence on the results WITHIN the image,
where the kernel meets no edge?

pro test_smooth

; make an array with a nan in the center
array = FINDGEN(5,5)
array[2,2] = !VALUES.F_NAN

print, ' Exp 1'
print, 'Expected', MEAN(array[1:3,1:3], /NAN)
print, 'No truncate', (smooth(array, 3, /NAN))[2,2]
print, 'Truncate', (smooth(array, 3, /NAN, /EDGE_TRUNCATE))[2,2]

; so far so good. Add a NaN somewhere else
array[1,1] = !VALUES.F_NAN
print, ' Exp 2'
print, 'Expected', MEAN(array[1:3,1:3], /NAN)
print, 'No truncate', (smooth(array, 3, /NAN))[2,2]
print, 'Truncate', (smooth(array, 3, /NAN, /EDGE_TRUNCATE))[2,2]

end

Thanks a lot!

Fabien

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[Message index]

		Smooth and /EDGE_TRUNCATE By: Fabzi on Tue, 29 April 2014 07:35
		Re: Smooth and /EDGE_TRUNCATE By: David Fanning on Tue, 29 April 2014 09:04
		Re: Smooth and /EDGE_TRUNCATE By: Fabzi on Tue, 29 April 2014 09:23

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