Re: Select list elements and exchange them
- To: mathgroup at smc.vnet.net
- Subject: [mg109829] Re: Select list elements and exchange them
- From: "David Park" <djmpark at comcast.net>
- Date: Wed, 19 May 2010 07:04:09 -0400 (EDT)
Use a Rule with ReplaceAll (/.).
testList /. {_, {3, 4}} -> {100, {3, 4}}
{{11, {2, 3}}, {100, {3, 4}}, {34, {5, 6}}, {51, {7, 8}}}
David Park
djmpark at comcast.net
http://home.comcast.net/~djmpark/
From: ishii.mitsuo.titanium at nsc.co.jp
[mailto:ishii.mitsuo.titanium at nsc.co.jp]
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