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Re: Finding NaNs in arrays - Strange outcome [message #92389 is a reply to message #92382]

Sat, 05 December 2015 13:24

wlandsman
Messages: 743
Registered: June 2000

Senior Member

On Saturday, December 5, 2015 at 7:02:49 AM UTC-5, dmfl...@gmail.com wrote:
> Hello
>
> I have a 3D array A ( A FLOAT = Array[480, 480, 160]). I wanted to check for NaNs so I had split one 2D array as follows:
>
> A1 = total(A[0:79, 0:79,25])
> A2 = total(A[80:159,80:159,25])

You are not "splitting" the array, but selecting disjoint square regions. For example, suppose an NaN value is present in the pixel [75,100,25]. This pixel is not included in either A1 or A2. But it will be included in your total

print, 'total',total(A[*,*,25])

so it is very plausible that total(A[*,*,25]) gives an NaN while A1+A2+A3+A4+A5+A6 does not.

--Wayne

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[Message index]

		Finding NaNs in arrays - Strange outcome By: dmfl0590 on Sat, 05 December 2015 04:02
		Re: Finding NaNs in arrays - Strange outcome By: David Fanning on Sat, 05 December 2015 06:38
		Re: Finding NaNs in arrays - Strange outcome By: dmfl0590 on Sat, 05 December 2015 08:16
		Re: Finding NaNs in arrays - Strange outcome By: dmfl0590 on Sat, 05 December 2015 08:24
		Re: Finding NaNs in arrays - Strange outcome By: David Fanning on Sat, 05 December 2015 08:46
		Re: Finding NaNs in arrays - Strange outcome By: dmfl0590 on Sat, 05 December 2015 10:05
		Re: Finding NaNs in arrays - Strange outcome By: David Fanning on Sat, 05 December 2015 10:40
		Re: Finding NaNs in arrays - Strange outcome By: wlandsman on Sat, 05 December 2015 13:24
		Re: Finding NaNs in arrays - Strange outcome By: dmfl0590 on Mon, 07 December 2015 03:35

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