Grouping {x,y z} data set

*To*: mathgroup at smc.vnet.net*Subject*: [mg99583] Grouping {x,y z} data set*From*: graser <graser at gmail.com>*Date*: Fri, 8 May 2009 00:18:10 -0400 (EDT)

Hi! I have a question for you. I have arbitrary data set. For example, Data={{x_1,y_1,z_1},{x_2,y_2,z_1},{x_1, y_2, z_3},........{x_n, y_m, z_L}} I tried to group this data set depending on z value. I mean I try to select all x, y values with same z value. But they are not evenly distributed and they are not integer either. please help me! Thanks!

**Follow-Ups**:**Re: Grouping {x,y z} data set***From:*Adriano Pascoletti <adriano.pascoletti@dimi.uniud.it>

**Re: Grouping {x,y z} data set***From:*Fred Simons <f.h.simons@tue.nl>