Patrick,
Sorry, the tf API documentation is actually ahead of the code.  The lookupVelocity method is a prototype targeted to be released into the next release of tf in geometry 1.1 which will go into the "latest" distro.  This is an API breaking change and thus will not be backported to boxturtle. 

The docs should reflect the earliest version for which this API was released.  I will update them shortly.  As far as I know everything else should be up to date. 

Tully

PS the lookupVelocity API will be changing see ticket https://code.ros.org/trac/ros-pkg/ticket/4010

On Mon, Apr 19, 2010 at 10:36 PM, Patrick Bouffard <bouffard@eecs.berkeley.edu> wrote:
I was just looking at the docs for the Python API to tf and noticed
the lookupVelocity function. However it seems (in boxturtle at least)
to not be implemented. There does look to be some source code but it
is commented out. Is this a feature that will return in a future
version? And are the Python tf API docs up to date, other than this
error?

Thanks,
Pat
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--
Tully Foote
Systems Engineer
Willow Garage, Inc.
tfoote@willowgarage.com
(650) 475-2827