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Mean and NaNs [message #83130]

Wed, 06 February 2013 08:16

Fabzi
Messages: 305
Registered: July 2010

Senior Member

Hi IDLers,

I know I have been annoying with NaNs lately, but is the following
"Floating illegal operand" supposed to happen???

IDL> print, !VERSION
{ x86_64 linux unix linux 8.2.2 Jan 23 2013 64 64}

IDL> data = FINDGEN(10,10,10)
IDL> data[5,5,*] = !VALUES.F_NAN
IDL> help, mean(data, /NAN)
<Expression> FLOAT = 499.444
IDL> help, mean(data, DIMENSION=3, /NAN)
<Expression> FLOAT = Array[10, 10]
% Program caused arithmetic error: Floating illegal operand

Which is related to:
IDL> print, mean(!VALUES.F_NAN)
NaN
IDL> print, mean(!VALUES.F_NAN, /NAN)
-NaN
% Program caused arithmetic error: Floating illegal operand

Is it my job to catch those cases or is something wrong?

Thanks,

Fabien

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