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VALUE_LOCATE and NaNs [message #81825]

Thu, 25 October 2012 02:14

Fabzi
Messages: 305
Registered: July 2010

Senior Member

Dear IDLers,

I am quite an adept of using NaNs as missing values for my data, because
many IDL routines go along with them. However, some of the routines are
not really documented about how they handle NaNs.
See the following example:

IDL> data = FINDGEN(10) & data[0] = !VALUES.F_NAN
IDL> p = VALUE_LOCATE(FINDGEN(10), data) & print, p[0]
-1
IDL> p = VALUE_LOCATE(INDGEN(10), data) & print, p[0]
0
% Program caused arithmetic error: Floating illegal operand

Which is quite dangerous! If I didn't debug my code to find the origin
of the Floating illegal operand warning, value_locate's output would be
wrong.

Someone else than me thinking of this as a bug?

Thanks,

Fab

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By: Fabzi on Thu, 25 October 2012 02:14

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