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2016-10-29 19:44:22 -0500 | commented question | Issues with header seq value (first value in rospy is 1, first value in roscpp is 0, access from roscpp) I submitted this issue to ros_comm tracker: https://github.com/ros/ros_comm/issue... |
2016-10-28 19:18:24 -0500 | answered a question | Exit code of roslaunch shutdown on node death I faced the same issue and I believe it is an important feature missing in roslaunch. I submitted a feature request/but report here: https://github.com/ros/ros_comm/issue... |
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2016-10-21 17:31:27 -0500 | asked a question | Issues with header seq value (first value in rospy is 1, first value in roscpp is 0, access from roscpp) I was planning to use Header seq value to verify that communication in my system of ROS-nodes (using ROS Indigo) is synchronized, however, I discovered a couple issues with that value. If that's a bug, I guess I can submit it to the ROS issue tracker.
Python exampleFirst, let's take a look at a slightly modified talker example from the tutorials: The output of the node is: And the output of rostopic echo /chatter/header/seq is: C++ exampleNow a seemingly equivalent c++ node: The output of the node is: And the output of rostopic echo /chatter/header/seq is: |
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2014-03-06 05:20:32 -0500 | asked a question | Static objects in Lidar view: set minimum distance or remove a sub-range of measurements I have a Lidar which I can only mount on my robot in such a way that there is always a static obstacle (part of the robot) in the middle of the Lidar range. I am planning to use the Lidar for obstacle avoidance, thus I'd like to somehow remove the static obstacle from the Lidar view. For my purposes it would be enough to filter out the measurements which are smaller than a certain min distance, or it would be even better if I could remove a certain angular range from the LaserScan. For example, my full Lidar range is from -135 degrees to +135 degrees, but I know that the measurements between, let's say, -10 degrees and +5 degrees will always return the same values (which will be interpreted by the obstacle avoidance algorithm as a very close object, and thus will affect the navigation), so I'd prefer to remove them from the LaserScan. I am using: Hokuyo URG-04LX-UG01, urg_node driver, costmap_2d. I could not find any standard mechanism for this in urg_node or costmap_2d, or another package. Please, let me know if such functionality is implemented anywhere, otherwise I'll have to write it myself. I'll appreciate any advice. Thanks. |
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2013-06-28 05:04:26 -0500 | answered a question | Error with rosinstall: rosws cannot find lib I am not sure what exactly went wrong in my case, but I had the same issue, and KruseT's advice didn't really work for me. To resolve the problem (maybe not the cleanest solution), I created a couple of symlinks: This worked for me. |
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2012-04-03 10:28:55 -0500 | commented answer | what IMUs work with ROS? Thanks for your reply, Eric. Do you know if there is anything analogous which would allow me to quickly use this IMU in ROS? |
2012-04-02 13:56:09 -0500 | answered a question | what IMUs work with ROS? Does anyone know what happened to the http://www.ros.org/wiki/imu_9drazor page? It seems to empty. |