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2018-09-21 02:45:52 -0600 commented answer Errors while using catkin_make in ROS inside Raspbian Stretch

Above error means that geometry_msgs package probably is not installed or it cannot be found. Does rospack find geometry

2018-09-14 04:23:10 -0600 received badge  Supporter (source)
2018-09-13 01:35:28 -0600 commented question I want to make a turtle pursue other turtle. And I also want to use geometry message twist. I dont know what is the problem of my code!!

I think that what you posted is not enough to answer your question, please update your question with minimal working exa

2018-09-07 02:35:42 -0600 received badge  Enthusiast
2018-09-06 01:40:45 -0600 commented question What does the odometry arrow in rviz indicate?

Yes, this should work.

2018-09-06 01:26:33 -0600 commented question What does the odometry arrow in rviz indicate?

Probably your robot is publishing odometry with wrong orientation. In relation to robot, X axis should point front, Y ax

2018-09-06 01:25:47 -0600 commented question What does the odometry arrow in rviz indicate?

Probably your robot is publishing odometry with wrong orientation. In relation to robot, X axis should point front, Y ax

2018-08-30 03:53:05 -0600 received badge  Teacher (source)
2018-08-30 01:32:30 -0600 answered a question synchronize between publisher and subscriber

You could latch the topic in publisher. For latched topics, last message published is sent to any new subscriber. You cr

2018-08-23 10:08:03 -0600 commented question Draw an OccupancyGrid?

There is a grid_map library. I'm using it to edit existing grid maps or creating new from scratch.