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NaN's in TOTAL, etc. [message #29906] Fri, 22 March 2002 14:30
K. Bowman is currently offline  K. Bowman
Messages: 330
Registered: May 2000
Senior Member
Has anyone noticed the following behavior?

IDL> x = findgen(3,3)
IDL> x[1,0] = !values.f_nan
IDL> x[2,*] = !values.f_nan
IDL> print, x
0.00000 NaN NaN
3.00000 4.00000 NaN
6.00000 7.00000 NaN
IDL> print, total(x, 2)
9.00000 NaN NaN
IDL> print, total(x, 2, /nan)
9.00000 11.0000 0.00000

^^^^^^^

Using /NAN, the sum of all NaN's is 0.0!

Wouldn't it make more sense if the result were NaN? At a minimum,
this makes /NAN far less useful.


Ken

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