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Re: Replace specific element with specific value.

  • To: mathgroup at smc.vnet.net
  • Subject: [mg99660] Re: Replace specific element with specific value.
  • From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
  • Date: Sun, 10 May 2009 05:18:18 -0400 (EDT)
  • References: <gu3av0$1f$1@smc.vnet.net>

Hi,

data /. {x -> x + xx, y -> y + yy, z -> z + zz}

?

Regards
   Jens

nick.maj at mssm.edu wrote:
> I tried this code, it gives me right and wrong results spreeded into
> nested lists.
> 
> data = {{0, 2}, {2, x}, {3, 4}, {4, 6}, {6, y}, {8, 9}, {9, z}}
> 
> Table[{#1, #2 + Which[#2 === j, i, #2 =!= j, 0]} & @@@
>   data, {i, {xx, yy, zz}}, {j, {x, y, z}}]
> 
> needed output:
> 
> {0, 2}, {2, x+xx}, {3, 4}, {4, 6}, {6, y+yy}, {8, 9}, {9, z+zz}}
> 
> While searching only the second element of each list, if x is found
> add xx and if y is found add yy to it etc.
> 
> How to. Thanks in advance, Nick.
> 


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