Re: rules and lists

*To*: mathgroup at smc.vnet.net*Subject*: [mg54250] Re: rules and lists*From*: "Ingolf Dahl" <ingolf.dahl at telia.com>*Date*: Mon, 14 Feb 2005 21:50:44 -0500 (EST)*Reply-to*: <ingolf.dahl at telia.com>*Sender*: owner-wri-mathgroup at wolfram.com

Here is one way: use an intermediate variable z, and do it in two steps: ({1, 2, 3, 3, 1, 2} //. {{x___, 1, 2, y___} -> {x, z, y}}) //. {{x___, z, y___} -> {x, Sequence[1, 2, 3], y}} Ingolf Dahl ingolf.dahl at telia.com Sweden -----Original Message----- From: Erich Neuwirth [mailto:erich.neuwirth at univie.ac.at] To: mathgroup at smc.vnet.net Subject: [mg54250] rules and lists I would like to replace sublists of a list to be replaced by another list, such that for example the rule {1,2}->{1,2,3} wout tranform {1,2,3,3,1,2} into {1,2,3,3,3,1,2,3} Simply gibbin the transformation rule in the form {x___,1,2,y___}->{x,1,2,3,y} does not work. What is the idiom to do what I want?