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Melodic Morenia is a distribution of Robot Operating System (ROS). Use this tag when your question relates specifically to Melodic Morenia. Always use this tag alongside the [ros] tag.

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What is the purpose of environment variables in launch files and how can we use them correct...

Hello! I have trouble grasping the necessity as long as the way of usage of the three environment variables in the husky_gazebo/launch/spawn_husky.launch file as shown in the code below. What would b …
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1 answer
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Adjusting Initial Position of /map Frame for Gazebo and Local Costmap

Hello everybody, this is my first question :) So, i just started using the husky_navigation package in order to simulate and navigate the Husky a200 in a field. I work on melodic. After I used gmappi …
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When exactly is a callback function executed?

Hello, I know that in general a callback function is executed when its associated topic has published values. What I am wondering is how do the commands spin() and spinOnce() in main affect the callb …
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