Re: Chop in Mathematica 8.0.1
- To: mathgroup at smc.vnet.net
- Subject: [mg117539] Re: Chop in Mathematica 8.0.1
- From: Oliver Ruebenkoenig <ruebenko at wolfram.com>
- Date: Tue, 22 Mar 2011 05:07:03 -0500 (EST)
On Mon, 21 Mar 2011, Andrzej Kozlowski wrote:
> Hmm... perhaps this is not a bug but a deliberate new design?
>
> Just evaluating
>
> 1.1 I
>
> returns
>
> 0. +1.1
>
> It seems a purely cosmetic issue but it does look a rather
> "untraditional". Can anyone confirm that this is indeed an intentional
> change?
>
> Andrzej Kozlowski
>
For example,
Developer`PackedArrayQ@Developer`ToPackedArray[{1. + I, 1.1 I}]
Oliver
>
>
> On 20 Mar 2011, at 12:44, 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
>
>
>