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[ROS Q&A] 148 – ROS CPP Time and Duration arithmetics build error

by Marco Arruda | Aug 11, 2018 | ROS Q&A

In this video we are going to explain about a problem trying to build a ROS C++ node using ros::Time and ros::Duration. It is because the order of the terms in sum operation matters. You can check in the video it is simple to solve but it can be a trap if you do not...

[ROS Q&A] 147 – How to make a Python file executable?

by Arif Rahman | Aug 7, 2018 | ROS Q&A

One of the most frequent question that we get in our customer support channels is an error when trying to 'rosrun' a Python file. The package is there, the file is there, the command has been typed in correctly, but it doesn't want to run. Sounds familiar? This...

[ROS in 5 mins] 021 – What is a ROS Subscriber

by Ruben Alves | Aug 7, 2018 | ROS Tutorials

Hello ROS Developers! In today's video we are going to see what is ROS Subscriber and how to see a list of them in a ROS Topic. Before we start, if you are new to ROS and want to Learn ROS Fast, I highly recommend you to take any of the following courses on...

[ROS Projects] Use OpenAI_ROS with WAM-V Step-by-Step

by Miguel Angel | Aug 6, 2018 | ROS Q&A

What you will learn? In this video you will learn how to use openai_ros package to make learn the WAM-V sea robot of the RobotX Challenge to pass the first Navigation Control. The only thing you need to code is the AI algorithm if you want to use a different...

[ROS Q&A] 146 – Command line argument passing in rosrun

by Marco Arruda | Aug 3, 2018 | ROS Q&A

In this video we are going to explore how to pass an argument through command line using rosrun. It can be a bit confusing, but we are going to explain the difference of the return of the method depending of the type of the value you pass to the argument....