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Re: Select list elements and exchange them

  • To: mathgroup at smc.vnet.net
  • Subject: [mg109830] Re: Select list elements and exchange them
  • From: chris <aarthur at tx.rr.com>
  • Date: Wed, 19 May 2010 07:04:20 -0400 (EDT)

{ {11,{2,3}},{21,{3,4}},{34,{5,6}},{51,{7,8}} }/.{x_Integer,{3,4}}->{100,{3,4}}


ishii.mitsuo.titanium at nsc.co.jp a =E9crit :
Hi
> I have a problem.
>
>
> I have a list.
>
> testList=={ {11,{2,3}},{21,{3,4}},{34,{5,6}},{51,{7,8}} }
>
> 1) From this list, select any element list such as {x,{3,4}},
>
>  where X is an arbitrary number.
>
>  
> In general, position of {x,{3,4}} in "testList" is not fixed.
>
> 2) Select any element list such as {x,{3,4}} and then  exchange {x,{3,4}} to {100,{3,4}}.
>
> 3)Make a new list finally.
>
> testListNew=={ {11,{2,3}},{100,{3,4}},{34,{5,6}},{51,{7,8}} }
>
> Please teach me how to solve.
>
> Thanks in advance.
>
> Mitsuo Ishii
>
>
>  



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