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Re: Inaccuracies [message #5294 is a reply to message #5290]

Wed, 15 November 1995 00:00

wclodius
Messages: 3
Registered: November 1995

Junior Member

In article <48djg2$b85@post.gsfc.nasa.gov>,
thompson@orpheus.nascom.nasa.gov (William Thompson) wrote:

> <snip>
> ...Round-off errors are determined solely by the floating point
> processing done by the CPU. It was stated earlier, without testing, that IDL
> was deficient in this repect relative to Fortran or C--I showed in an earlier
> message that this was not the case.

Round off errors are the result of the algorithm, the process of
translating this algorithm into CPU and FPU operations, and FPU floating
point processing. For simple algorithms, as in the example that prompted
this thread, the translation of the algorithm for reasonable
implementations is liable to produce the same FPU processing. In such a
case you are correct. For more complicated algorithms, with optimizing
translations, that need not be the case.

--
William B. Clodius Phone (505) 665-9370
Los Alamos Natl. Lab. NIS-1 FAX (505) 665-7395
PO Box 1663, MS-D466 Group Office (505) 667-2701

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[Message index]

		Re: Inaccuracies By: C R Shaw on Thu, 16 November 1995 00:00
		Re: Inaccuracies By: Hermann Mannstein on Thu, 16 November 1995 00:00
		Re: Inaccuracies By: wclodius on Wed, 15 November 1995 00:00
		Re: Inaccuracies By: Andy Loughe on Wed, 15 November 1995 00:00
		Re: Inaccuracies By: thompson on Wed, 15 November 1995 00:00
		Re: Inaccuracies By: hahn on Tue, 14 November 1995 00:00
		Re: Inaccuracies By: lpmix on Tue, 14 November 1995 00:00
		Re: Inaccuracies By: Andy Loughe on Tue, 14 November 1995 00:00
		Re: Inaccuracies By: wclodius on Tue, 14 November 1995 00:00
		Re: Inaccuracies By: thompson on Tue, 14 November 1995 00:00
		Re: Inaccuracies By: Jackel on Tue, 14 November 1995 00:00

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