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Re: Filtering out NaNs [message #8507 is a reply to message #8502]

Thu, 20 March 1997 00:00

thompson
Messages: 584
Registered: August 1991

Senior Member

sritcey@is.dal.ca (Stephen Ritcey) writes:

> What exactly does FINITE do on IDL?

In IDL, the FINITE function does filter out both NaN values and plus and minus
infinity.

Personally, I don't like to write software that depends on IEEE arithmetic,
because it makes the software somewhat less portable. There's probably only
one platform that IDL runs on that doesn't use IEEE floating point numbers, and
that's VMS (on either VAX or AXP). However, it's still critical for us to
support VMS. Thus, when an XDR-formatted file is read containing NaN values,
then those pixels are converted to an ordinary number that is used to signal
missing data, and vice-versa. The question of how to handle +/-Inf has never
arisen.

Bill Thompson

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[Message index]

		Re: Filtering out NaNs By: Dale Bailey on Thu, 20 March 1997 00:00
		Re: Filtering out NaNs By: thompson on Thu, 20 March 1997 00:00
		Re: Filtering out NaNs By: peter on Thu, 20 March 1997 00:00
		Re: Filtering out NaNs By: bowman on Thu, 20 March 1997 00:00
		Re: Filtering out NaNs By: f055 on Thu, 20 March 1997 00:00
		Re: Filtering out NaNs By: sritcey on Thu, 20 March 1997 00:00
		Re: Filtering out NaNs By: bowman on Wed, 19 March 1997 00:00
		Re: Filtering out NaNs By: davidf on Wed, 19 March 1997 00:00
		Re: Filtering out NaNs By: Tim Patterson on Wed, 19 March 1997 00:00

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