Re: How to reverse sign on the y's in a list of (x, y)'s?
- To: mathgroup at smc.vnet.net
- Subject: [mg61257] Re: [mg61231] How to reverse sign on the y's in a list of (x, y)'s?
- From: Bob Hanlon <hanlonr at cox.net>
- Date: Fri, 14 Oct 2005 05:53:48 -0400 (EDT)
- Reply-to: hanlonr at cox.net
- Sender: owner-wri-mathgroup at wolfram.com
data=Table[{Random[],Random[]},{3}] {{0.5566055767951565, 0.11695563345151412}, {0.5886363424084826, 0.7475217203750398}, {0.7924491804881474, 0.03645907331756618}} {1,-1}#&/@data {{0.5566055767951565, -0.11695563345151412}, {0.5886363424084826, -0.7475217203750398}, {0.7924491804881474, -0.03645907331756618}} Bob Hanlon > > From: sherifffruitfly at gmail.com To: mathgroup at smc.vnet.net > Date: 2005/10/13 Thu AM 01:39:38 EDT > Subject: [mg61257] [mg61231] How to reverse sign on the y's in a list of (x, y)'s? > > 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? > > thanks! > >