Re: Vector operations,

*To*: mathgroup at smc.vnet.net*Subject*: [mg70012] Re: Vector operations,*From*: "ben" <benjamin.friedrich at gmail.com>*Date*: Sat, 30 Sep 2006 05:12:42 -0400 (EDT)*References*: <efitqn$lu4$1@smc.vnet.net>

What about {{1/2, 1/2}, {1, 0}, {0, 1}, {0, 0}} . {{Cos[\[Alpha]], Sin[\[Alpha]]}, {-Sin[\[Alpha]], Cos[\[Alpha]]}} ? Ben mickey schrieb: > Hi, > > I have a list of vectors such as > > {{1/2, 1/2}, {1, 0}, {0, 1}, {0, 0}} > > I want to rotate them all by the same angle. Right now, what I do is > multiply each by RotationMatrix2D[t] and iterate over the list. Is there > a more efficient way to do this? > > Thanks, > -M