RE: ReplaceAll and rules from a list v7.0

*To*: mathgroup at smc.vnet.net*Subject*: [mg104271] RE: [mg104227] ReplaceAll and rules from a list v7.0*From*: "David Park" <djmpark at comcast.net>*Date*: Sun, 25 Oct 2009 01:09:58 -0400 (EDT)*References*: <21648869.1256367070497.JavaMail.root@n11>

I don't see why you are trying to do this with an equation and ReplaceAll instead of a function. Just Map Total onto the list. list = {{1, 1}, {2, 2}, {3, 3}}; Total /@ list {2, 4, 6} Or you could design your own particular function for combining a and b. add[{a_, b_}] := a + b add /@ list {2, 4, 6} David Park djmpark at comcast.net http://home.comcast.net/~djmpark/ From: kristoph [mailto:kristophs.post at web.de] Hi, Suppose I have the equation x=a+b and the list l={{1,1},{2,2},{3,3}} How can I quickly assign the list to the above equation, that is, I would like to get the following result {2,4,6} The first element of each sub-list should be assigned to a and the second to b. Thanks in advance. Kristoph