Re: How to reverse sign on the y's in a list of (x, y)'s?

*To*: mathgroup at smc.vnet.net*Subject*: [mg61261] Re: How to reverse sign on the y's in a list of (x, y)'s?*From*: Helen Read <read at math.uvm.edu>*Date*: Fri, 14 Oct 2005 05:53:53 -0400 (EDT)*References*: <dikt77$4tm$1@smc.vnet.net>*Sender*: owner-wri-mathgroup at wolfram.com

sherifffruitfly at gmail.com wrote: > Hi all, > > This is really dumb, but I just don't know how to do it... > > Import from excel gives me a list of ordered pairs, and I want the 2nd > element of each pair to be of opposite sign. Sticking the negative sign > in front of the entire Import statement reverses both the 1st and the > 2nd elements (duh). How do I get just the second item to reverse sign? v = your list of ordered pairs Map[{#[[1]], -#[[2]]} &, v] -- Helen Read University of Vermont