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Re: (- 2.8 1.6) ; 1.1999999999999997
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From: |
tomas |
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Subject: |
Re: (- 2.8 1.6) ; 1.1999999999999997 |
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Date: |
Mon, 10 Feb 2020 22:31:14 +0100 |
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User-agent: |
Mutt/1.5.21 (2010-09-15) |
On Mon, Feb 10, 2020 at 10:18:48PM +0100, Emanuel Berg via Users list for the
GNU Emacs text editor wrote:
> What's this?
>
> (- 2.8 1.6) ; 1.1999999999999997
>
> With the TI-84 Plus,
>
> 2.8-1.6=1.2
>
> Normally I'm all pro-Lisp but here...
Those numbers aren't exactly representable as binary fractions
(2.8 = 14/5, 1.6 = 8/5). So things like this happen. It's not
Lisp, but an artifact of the underlying representation (as
binary "floats" with limited precision).
Cheers
-- tomás
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