Re: Select list elements and exchange them
- To: mathgroup at smc.vnet.net
- Subject: [mg109821] Re: Select list elements and exchange them
- From: Peter Breitfeld <phbrf at t-online.de>
- Date: Wed, 19 May 2010 07:02:42 -0400 (EDT)
- References: <hstp64$mbi$1@smc.vnet.net>
ishii.mitsuo.titanium at nsc.co.jp wrote: > 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 > First search, where the member is pos=Position[testList,{_,{3,4}}] newlist=ReplacePart[testList, pos->{100,{3,5}}] -- _________________________________________________________________ Peter Breitfeld, Bad Saulgau, Germany -- http://www.pBreitfeld.de