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the NaN effect :-| [message #54397]

Tue, 12 June 2007 08:33

rkombiyil
Messages: 59
Registered: March 2006

Member

This stumps me.. We had some discussions on NaN's earlier, but mostly
wrt 'TOTAL'
Lets say,
IDL>a=[6.2,12.5,14.1,0.,22,!values.f_nan]
IDL> print,max(a)
22.0000
IDL> print,min(a)
0.00000

; Now I increase number of NaN's in the array :D

IDL> a=[6.2,12.5,14.1,0.,!values.f_nan,22,!values.f_nan]
IDL> print,max(a)
22.0000
IDL> print,min(a)
0.00000

; go on, repeat this (it is 00:23 where I am @, so CARPE NOCTEM! ) :-P

IDL> a=[!values.f_nan,6.2,12.5,14.1,0.,!values.f_nan,22,!values.f _nan]
IDL> print,min(a)
NaN
IDL> print,max(a)
NaN
============================================
Same goes for MIN also. ??!!

IDL's docu says:
<snip from IDL ref guide: Page 1269/4090>
If the MAX function is run on an array containing NaN values and the
NAN keyword is not set, an invalid result will occur.
</snip>
The same is said for MIN also.

So the result (OPS with MIN/MAX) is directly proportional to the
number of NaN's we eat? er, add to the array? :P

So what is right and what is wrong? Enlighten, please.
/metachronist

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[Message index]

		the NaN effect :-\| By: rkombiyil on Tue, 12 June 2007 08:33
		Re: the NaN effect :-\| By: Jim Pendleton, ITT Vi on Wed, 13 June 2007 09:43

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