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Re: converting ieee-float-format to pw-wave-float-format [message #2749 is a reply to message #2659]

Fri, 26 August 1994 07:44

thompson
Messages: 584
Registered: August 1991

Senior Member

grunes@imsy1.nrl.navy.mil (Mitchell R Grunes) writes:

> No. IEEE does not define byte order--at least it is in oposite order
> on PCs from the most common useage on most Unix Workstations (Suns,
> SGIs,... -- but watch out for Dec Alpha, which someone told me use
> backwards (least significant byte first, like the PC) byte order.

I've often seen the byte order with the most significant byte first, i.e.
that use on most Unix workstations, referred to as the "network" byte order.
Most interchange formats, such as FITS, which are meant to be transportable
from machine to machine, use that byte order.

> One thing puzzles me: Most floating point numbers translate between
> Suns and PCs simply throught BYTEORDER. But NAN values seem to
> behave differently. Does anyone know why?

If both machines follow the IEEE standard, then both should recognize the same
NaN values. However, many bit patterns can represent NaN. Perhaps the two
machines use a different *default* NaN value.

Bill Thompson

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[Message index]

		converting ieee-float-format to pw-wave-float-format By: SLAMECZKA on Fri, 26 August 1994 01:07
		Re: converting ieee-float-format to pw-wave-float-format By: grunes on Thu, 25 August 1994 12:39
		Re: converting ieee-float-format to pw-wave-float-format By: thompson on Fri, 26 August 1994 07:44
		Re: converting ieee-float-format to pw-wave-float-format By: caron on Thu, 25 August 1994 08:52
		Re: converting ieee-float-format to pw-wave-float-format By: grunes on Fri, 26 August 1994 06:51
		Re: converting ieee-float-format to pw-wave-float-format By: grunes on Fri, 26 August 1994 05:47

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