Newbie: Rotataion2D use problem

*To*: mathgroup at smc.vnet.net*Subject*: [mg66675] Newbie: Rotataion2D use problem*From*: akil <akil39 at gmail.com>*Date*: Sat, 27 May 2006 03:50:43 -0400 (EDT)*Sender*: owner-wri-mathgroup at wolfram.com

I have some problems using Mathematica's Rotate2D, it doesnot give the results as I want them Eample: a={10, 30} b={80., 0.} c={38.7689, 0.} theta = -0.24497866312686414` theta2 = -0.3430239404207034` Rotate2D[a, theta, test[[1]]] Rotate2D[%, theta2, test[[2]]] this gives: \!\({2.7134309891835002`, 1.7763568394002505`*^-15}\) While the y-value should be 0 instead of 1.7763568394002505`*^-15. Anyone know how I can easily fix this, so that I get 0 here instead? Explanation of reasoning: I need to rotate points about points so that they have the same values, and sometimes like here there are a couple of rotations about points needed, and I always get these weird values, but I reeally need them to be 0 for further research purposes. (By the way, thanks to all people that replied to my previous post, still need to decide on which one to use, but the problem got a bit harder there, by some complications that are now involved, something to do with clockwise order of found points.) Akil

**Follow-Ups**:**Re: Newbie: Rotataion2D use problem***From:*gardyloo <gardyloo@mail.wsu.edu>