Re: Problem with Thread over Plus?
- To: mathgroup at smc.vnet.net
- Subject: [mg65392] Re: Problem with Thread over Plus?
- From: Jean-Marc Gulliet <jeanmarc.gulliet at gmail.com>
- Date: Thu, 30 Mar 2006 05:29:42 -0500 (EST)
- Organization: The Open University, Milton Keynes, UK
- References: <e0dsg9$r67$1@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
Virgilio, Vincent - SSD wrote:
> Hello,
>
> Why does this work:
>
> Thread[ Plus[ {1,1} , { {1,1} , {2,2} } ] ]
>
> but this doesn't?
>
> Thread[ Plus[ {1,1} , { {1,1} , {2,2} , {3,3} } ] ]
>
> Thanks,
>
> Vince Virgilio
As stated by the error message returned by In[1], both list must be of
equal lengths. Therefore, In[2], with three 1s rather than two, works as
expected.
In[1]:=
Thread[{1, 1} + {{1, 1}, {2, 2}, {3, 3}}]
Thread::tdlen: Objects of unequal length in {1, 1} + {{1, 1}, {2, 2},
{3, 3}} cannot be combined.
Thread::tdlen: Objects of unequal length in {1, 1} + {{1, 1}, {2, 2},
{3, 3}} cannot be combined.
Out[1]=
{1, 1} + {{1, 1}, {2, 2}, {3, 3}}
In[2]:=
Thread[{1, 1, 1} + {{1, 1}, {2, 2}, {3, 3}}]
Out[2]=
{{2, 3, 4}, {2, 3, 4}}
Regards,
JM