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Re: Deleting elements from a Table

  • To: mathgroup at smc.vnet.net
  • Subject: [mg85932] Re: Deleting elements from a Table
  • From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
  • Date: Thu, 28 Feb 2008 02:46:27 -0500 (EST)
  • Organization: Uni Leipzig
  • References: <fq0u1f$k7g$1@smc.vnet.net> <fq1296$mdj$1@smc.vnet.net> <fq3a9b$fl8$1@smc.vnet.net>
  • Reply-to: kuska at informatik.uni-leipzig.de

Hi,

this may be very time expensive.
But

TabIN /. {a___,{q_,_},c___,{q_,_},b___}:> {a,c,b}

will do that.

Regards
   Jens

Luigi B wrote:
> On 26 Feb, 13:56, Jens-Peer Kuska <ku... at informatik.uni-leipzig.de>
> wrote:
>> Hi,
>>
>> TabIN /. {a___,{q_,_},{q_,_},b___}:> {a,b}
>>
>> if the second element are not follow the first, you may
>> Sort[] the list.
>>
>> Regards
>>    Jens
>>
>> L.Balz... at gmail.com wrote:
>>> Dear All,
>>>  I have go the following problem:
>>> I have a table of elements like {{x1,y1},{x2,y2}....}. Occasionally,
>>> two elements have the same x. I would like to drop these elements with
>>> a rule-based function.
>>> Example:
>>> TabIN={{1,1},{1,2},{2,2}};
>>> my desired output is:
>>> TabOUT={{2,2}}
>>> Any help?
>>> Thanks
>>> Luigi
> 
> Thanks, it works!
> but what if (time-wise) I want to skip the Sort of the input table?
> 
> ciao
> Luigi
> 


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