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To: python-list@python.org
From: Dennis Lee Bieber <wlfraed@ix.netcom.com>
Subject: Re: a.index(float('nan')) fails
Date: Sat, 27 Oct 2012 13:07:12 -0400
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Xref: csiph.com comp.lang.python:32287

On Sat, 27 Oct 2012 08:56:16 +0200, Thomas Rachel
<nutznetz-0c1b6768-bfa9-48d5-a470-7603bd3aa915@spamschutz.glglgl.de>
declaimed the following in gmane.comp.python.general:

> Am 27.10.2012 06:48 schrieb Dennis Lee Bieber:
> 
> > 	I don't know about the more modern calculators, but at least up
> > through my HP-41CX, HP calculators didn't do (binary) "floating
> > point"... They did a form of BCD with a fixed number of significant
> > /decimal/ digits
> 
> Then, what about sqrt(x)**2 or arcsin(sin(x))? Did that always return 
> the original x?
>
	The HPs probably not -- since they truncated at the decimal digit
level. The models with guard digits might have displayed the original,
as they used the guard digits to round results back up the display/entry
width (and to handle the infamous repeated addition of small amounts
<G>)
-- 
	Wulfraed                 Dennis Lee Bieber         AF6VN
        wlfraed@ix.netcom.com    HTTP://wlfraed.home.netcom.com/