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Odd behavior with NaNs [message #93513]

Tue, 09 August 2016 09:28

whdaffer
Messages: 10
Registered: January 2000

Junior Member

At least, I think it's odd.

IDL> print,sqrt(!values.f_nan>0.0)
0.00000
% Program caused arithmetic error: Floating illegal operand
IDL>

-- while --

IDL> print,sqrt(!values.f_nan)
NaN

I was trying to protect against taking the sqrt of a negative number. I guess I could just remove the >0.0 and live with

DL> print,sqrt(-1)
-NaN
% Program caused arithmetic error: Floating illegal operand

whenever there are negative numbers in my data.

What does the community think? Bug? Feature?

whd

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[Message index]

		Odd behavior with NaNs By: whdaffer on Tue, 09 August 2016 09:28
		Re: Odd behavior with NaNs By: Craig Markwardt on Tue, 09 August 2016 16:42

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