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Re: Testing for NODATA presence in a dataset [message #33426 is a reply to message #33389]

Fri, 03 January 2003 06:10

tam
Messages: 48
Registered: February 2000

Member

With regard to the discussion of the behavior of NaNs
especially on Windows machines:

I got a very nice, unofficial, response from someone at RSI indicating
that they agreed in principle the behavior should be IEEE 754
compliant, but that behavior is not currently supported
by the Microsoft compilers used in building IDL for Windows.
With these compilers 'proper' behavior would incur an unacceptable
performance penalty. We had a short dialog and in the process found out
that the latest versions of the Visual C++ compiler indicate
that Microsoft has made a change in the way it handles NaNs so
that arithmetic comparisons are IEEE 754 compliant. If this
turns out to be true there a good chance that in the future
the behavior of the Windows and Unix versions of IDL will be consistent.

Of course this is all non-official, but I was very impressed by
the responsiveness of RSI. It seems clear that they are both
aware of this issue and looking to see how it can be resolved
without compromising IDL performance.

Regards,
Tom McGlynn

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[Message index]

		Testing for NODATA presence in a dataset By: Jonathan Greenberg on Sat, 21 December 2002 14:00
		Re: Testing for NODATA presence in a dataset By: tam on Fri, 03 January 2003 06:10
		Re: Testing for NODATA presence in a dataset By: George N. White III on Fri, 03 January 2003 07:00

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