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2016-02-02 06:43:04 -0500 | commented answer | working with Markers the x coordinate is NOT constant! |
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2016-01-21 15:58:01 -0500 | answered a question | working with Markers Hi Jorge, actually, I would like to receive what the programme "points_and_lines.cpp" (from the mentioned tutorial) publishes. As you can see in the source code of this programme, the coordinates are changing. Here is the section, which explains the change of the coordinates: For the moment, let us try to receive only the x-coordinate. The printout should be like this: When I try your code, I get, as you described, only the same message over and over again: Therefore, I tried this line of code, instead of yours: But then I receive: I cannot explain, why I am getting the same value of x and why y and z are getting printed on the terminal at all. This is absolutely not what I want. I only want to work with the different x-coordinates. Has somebody an idea, how to receive the different x-coordinates? With best regards Commander Data |
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2016-01-20 12:06:47 -0500 | asked a question | working with Markers The solution of my problem is beneath. Hi guys, before I posted this question, I did this tutorial about markers: http://wiki.ros.org/rviz/Tutorials/Ma... (Thank you for this tutorial!) It worked pretty well! I understood how to change the value of the coordinates x,y, and z and how to publish points. Publishing points is no problem anymore. Now, I would like to program a "listener", which receives exactly these points and print them out. Unfortunately, I "only" found this tutorial: http://wiki.ros.org/ROS/Tutorials/Wri... Therefore, I began with writing this "listener": Unfortunately, it didn't work out at all. Can someone please help me solving the problem? I would like to know how I can receive the coordinates and work with them. For instance: With best regards Commander Data SOLUTION: The chatterCallback function needs to look like this: Moreover, I changed in points_and_lines.cpp the line 93 I hope that this will help some researches in receiving points! For everyone, who participate in finding the solution: THANK YOU A LOT!!! With best regards, Commander Data |
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2015-10-04 13:51:52 -0500 | asked a question | problem at modifiying a map Hello, at the moment I am trying to get through the turtlebot tutorial. http://wiki.ros.org/turtlebot_stage/T... Unfortunately, I am stuck at this point:
I entered:
and I received this:
The files are in the folder: /home/myusername/stageTutorial With roslaunch turtlebot_stage turtlebot_in_stage.launch the simulator appears. Can you please help me to rviz up the files? With best regards |
2015-10-03 10:32:52 -0500 | asked a question | turtlebot packages could't be found Hello, I would like to install turtlebot on my Ubuntu 14.04.3 LTS. After installing ROS, I entered the following code into the terminal: And I received this reply: What do I need to do to install turtlebot? With best regards |
2015-10-03 10:32:51 -0500 | asked a question | Unable to install turtlebot Hello, I would like to install turtlebot on my Ubuntu 14.04.3 LTS. After installing ROS, I entered the following code into the terminal: sudo apt-get install ros-indigo-turtlebot ros-indigo-turtlebot-apps ros-indigo-turtlebot-interactions ros-indigo-turtlebot-simulator ros-indigo-kobuki-ftdi ros-indigo-rocon-remocon ros-indigo-rocon-qt-library ros-indigo-ar-track-alvar-msgs And I get this reply: E: package ros-indigo-turtlebot could't be found. E: package ros-indigo-turtlebot-apps could't be found. E: package ros-indigo-turtlebot-interactions could't be found. E: package ros-indigo-turtlebot-simulator could't be found. E: package ros-indigo-kobuki-ftdi could't be found. E: package ros-indigo-rocon-remocon could't be found. E: package ros-indigo-rocon-qt-library could't be found. E: package ros-indigo-ar-track-alvar-msgs could't be found. What do I need to do to install turtlebot? With best regards |