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2016-05-09 21:02:49 -0500 marked best answer i can not make using_markers(ie,to place somthing to the rviz)

rosmake using_markers [ rosmake ] rosmake starting...
[ rosmake ] Packages requested are: ['using_markers']
[ rosmake ] Logging to directory /home/liqiming/.ros/rosmake/rosmake_output-20131210-195602 [ rosmake ] Expanded args ['using_markers'] to: []
[ rosmake ] WARNING: The following args could not be parsed as stacks or packages: ['using_markers'] [ rosmake ] ERROR: No arguments could be parsed into valid package or stack names. that is the process i follow the tutorial of the web of RVIZ

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2015-11-02 01:47:13 -0500 marked best answer sudo apt-get ros-groovy-joystick-drivers [sudo] password for liqiming: E: Invalid operation ros-groovy-joystick-drivers

sudo apt-get ros-groovy-joystick-drivers [sudo] password for liqiming: E: Invalid operation ros-groovy-joystick-drivers why?

2015-11-02 01:47:06 -0500 marked best answer URDF wrong

when i input the command"rosrun urdf_parser check_urdf my_robot.urdf "to the new terminal.error emerge as below: ERROR: Model Parsing the xml failed

2015-11-02 01:42:57 -0500 marked best answer can not find urdf.why?how to solve it?

rosrun urdfdom check_urdf my_robot.urdf [rospack] Error: stack/package urdfdom not found

2015-11-02 01:42:51 -0500 marked best answer what does the"rpy" in URDF file means?

<origin xyz="-2 5 0" rpy="0 0 1.57"/>.this is just a small part of the urdf file.actually i do not know the meaning of"rpy=0 0 1.57".what does rpy stand for?

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2014-01-06 20:17:56 -0500 asked a question what does roslib.load_manifest() do?
import roslib
roslib.load_manifest('pr2_pick_and_place_demos').

this is one part of a python file. i do not know the meaning of roslib.load_manifest('pr2_pick_and_place_demos').someone to tell me .TA

2014-01-06 00:38:28 -0500 commented answer what does the"rpy" in URDF file means?

THANK YOU.