ros/ros_comm — pull request #386 by efernandez (2014-04-29 14:35:36+00:00)
Title: adds op tool (for python operations)

Allows to do python operations between message fields taken from several topics.

A typical use case consist on calculating the norm of a vector, or converting a quaternion to Euler angles for visualization; some examples are included in the `op` python script header comment.