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first 'roscore' and a question arrises- like i'm 5

asked 2017-08-24 17:32:07 -0500

updated 2017-08-24 18:24:08 -0500

jayess gravatar image

~beginner decrypting the workings of ROS~ hmm.. how to phrase this.. well, partly, I'm wondering

  1. if I need to also be in my catkin workspace before roslaunching...
  2. what is the difference between the catkin and roslaunch?
  3. I understand that the catkin is like a framework/build system basically for package management??
  4. So now that I'm learning about nodes, I'm wondering, how is the node different from a catkin built package?
  5. How are roslaunch and associated tools, different from catkin?
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There's a lot of questions here... Have you gone through the tutorials?

jayess gravatar imagejayess ( 2017-08-24 18:06:37 -0500 )edit

I edited your question to make it a bit easier to see all the questions.

jayess gravatar imagejayess ( 2017-08-24 18:24:28 -0500 )edit

I think that the Getting Started pages might be more suitable for a first introduction, especially when the questions are more of a conceptual nature.

gvdhoorn gravatar imagegvdhoorn ( 2017-08-25 02:12:24 -0500 )edit
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@binarybabe: it might be helpful for you to go get a book or two about ROS. Some are even free. See wiki/Books. A good one is probably: A Gentle Introduction to ROS.

gvdhoorn gravatar imagegvdhoorn ( 2017-08-25 02:13:37 -0500 )edit

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answered 2017-08-24 18:26:08 -0500

jayess gravatar image

updated 2017-08-25 02:22:49 -0500

  1. No, you don't need to be in your workspace to run roslaunch, you can roslaunch from anywhere.
  2. catkin is used to create and build packages and roslaunch starts up nodes, sets parameters, etc.
  3. As @gvdhoorn pointed out in the comments, catkin

    is a wrapper around CMake that makes building entire ROS workspaces easier / feasible. Package management is expressly not part of its responsibilities.

  4. A node is a program and a catkin package is a place that houses nodes and certain files.

  5. See #2.
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@jayess: no, catkin is not a framework for package management. It is a wrapper around CMake that makes building entire ROS workspaces easier / feasible. Package management is expressly not part of its responsibilities.

gvdhoorn gravatar imagegvdhoorn ( 2017-08-25 02:11:43 -0500 )edit

@gvdhoorn: thanks for pointing out my error. I updated the answer based on your comment.

jayess gravatar imagejayess ( 2017-08-25 02:20:00 -0500 )edit

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Asked: 2017-08-24 17:32:07 -0500

Seen: 82 times

Last updated: Aug 25 '17