On Thu, 2010-05-27 at 06:45 -0700, Narasimhan wrote: 
> k. thanks. i have i more doubt
> in the tutorial  http://www.ros.org/wiki/ROS/Tutorials/UnderstandingTopics
> understanding topics 
> the command
> rostopic hz /turtle1/pose as per the tutorial averages around 60hz
> 
> but for me it averages around 64hz. is there a problem

As far as I  know, that just means your computer is faster than the
computer used by person who wrote the tutorial. So you are getting more
messages per second.