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Re: A question on the range of floats in Emacs


From: Jay Belanger
Subject: Re: A question on the range of floats in Emacs
Date: Tue, 17 Jul 2007 15:41:12 -0500
User-agent: Gnus/5.11 (Gnus v5.11) Emacs/22.1.50 (gnu/linux)

address@hidden (Johan Bockgård) writes:
...
> The cl package can determine a number of floating point parameters.
> See
>
>   (info "(cl)Implementation Parameters")

Wonderful; thanks.
I guess this information isn't easily accessible, so it is 
computed.  I played around with the largest and smallest floats, and I
was wondering about precision.  Near the smallest float, the precision
can be small; on my computer, 5e-324, 5.1e-324 and 4.9e-324 all evaluate to
5e-324; 3.47e-323 evaluates to 3.5e-324, etc.  Is there a range (say
from smallest-exponent + N to largest-exponent - N) in which the
precision is fixed?  (It appears that way here; is it true in general?)

Jay





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