Re: Fourier and 0 and N
- To: mathgroup at smc.vnet.net
- Subject: [mg4938] Re: Fourier and 0 and N
- From: Robert Knapp <rknapp>
- Date: Mon, 7 Oct 1996 02:02:10 -0400
- Organization: Wolfram Research
- Sender: owner-wri-mathgroup at wolfram.com
Michael Schaferkotter wrote:
> is there something about 0 here that i am not understanding?
> this came up using Chop and Fourier.
Mathematica distinguishes between an exact zero (0) and an inexact zero
(0. or 0.0). N is defined to be the exact 0. In Mathematica version
2.2, Fourier only took a numerical argument. In version 3.0, which will
be out soon, all of the commands above will return the Fourier transform
you would expect done useing machine precision complex numbers.
> Sqrt > 2 returns
> Sqrt > 2
> Sqrt > 0 returns
This is because Sqrt evaluates to 0, and 0 > 0 is False, but Sqrt
is not a number so the comparison is not made.
In Mathematica version 3.0, Sqrt > 2 returns False.
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