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Re: Chop in Mathematica 8.0.1

  • To: mathgroup at smc.vnet.net
  • Subject: [mg117543] Re: Chop in Mathematica 8.0.1
  • From: David Bailey <dave at removedbailey.co.uk>
  • Date: Tue, 22 Mar 2011 05:07:47 -0500 (EST)
  • References: <im7c6c$74$1@smc.vnet.net>

On 21/03/2011 11:18, Andrzej Kozlowski wrote:
> Chop does not seem to work properly in Mathematica 8.0.1:
>
> f[a_] := 2 I Pi Sin[a]/a
>
> In[2]:= f[1.]
>
> Out[2]= 0. + 5.287118128162912*I
>
> In[3]:= Chop[%]
>
> Out[3]= 0. + 5.287118128162912*I
>
> This is with
>
> In[4]:= $Version
>
> Out[4]= 8.0 for Mac OS X x86 (64-bit) (February 23, 2011)
>
>   Mathematica 7.01 returns 5.287118128162912*I as expected.
>
> Can anyone confirm it? At the moment I can't see any simple work around...
>
> Andrzej Kozlowski
>
The same problem happens with 64-bit Windows amd 8.0.1 .

This seems to be deliberate - see the first item under "Possible Issues" 
in the help for Chop.

David Bailey
http://www.dbaileyconsultancy.co.uk



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