[ros-users] cmd_vel topic has no attribute linear

[Ken Conley]

Hi hitesh,

It would help if you cut and paste the exact error message and include a
sample program. I suspect that the program is using the subscriber object
instead of the message object, but this is hard to tell without more
information.

Ken

On Apr 18, 2010 9:43 AM, "hitesh dhiman" <hitesh.dhiman.1988 at gmail.com>
wrote:

Hi all,
I'm trying to subscribe to the cmd_vel message, According to the definition,
the message is of type Twist, with 2 vectors linear and angular.
My node to access this topic is in python.
For example, if the subscriber is vel = rospy.Subscriber("/cmd_vel", Twist)
if i try to print out vel.linear, it gives an attribute error, stating the
subscriber object has no attribute linear.

Any idea what I'm doing wrong here?

-- 
Regards,
Hitesh Dhiman
Electrical Engineering
National University of Singapore

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