Questions tagged [tutorials]

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gazebo imu sensor is falling down in Nav2 getting started example

I'm trying to modify Nav2 Getting Started example to fuse diff_drive odometry and imu data via robot_localization pkg, but I've noticed that the simulated imu sensor outputs an inadequate data. ...
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Intraprocess zero-copy seems to be working for multiple subscribers

When following instructions from Pipeline with two image viewers, running ros2 run intra_process_demo image_pipeline_with_two_image_view the expected result is ...
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How do you install tf_transformations?

I've recently been following the ROS 2 Galactic tutorials and I've reached "Introduction to tf2". I wasn't able to install the demos with ...
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export ROS_HOSTNAME, ROS_MASTER_URI configuration problem

Hello all, I was trying all day to figure out why my cmd won't accept my arrow keys as input for the turtlesim example. At first I though there was some configuration problem with the shell I use (zsh)...
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ROS2: Using parameters in a class (Python) - No output before Ctrl+C

Hello, I'm new to ROS2 but have previously worked with ROS Kinetic. I have built ROS2 Foxy on 64-bit Windows 10 and currently going through tutorials in Tutorial: Using parameters in a class (Python), ...
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Tutorial page in portuguese

I was following some tutorials and got to this page in portuguese (?). Is this an error in the websites language handling system? http://wiki.ros.org/ROS/Tutorials/ExaminingPublisherSubscriber ...
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TF2 Tutorial Static Broadcaster Python

https://wiki.ros.org/tf2/Tutorials/Writing%20a%20tf2%20static%20broadcaster%20%28Python%29 Hi, running through this tutorial and its not clear whether I should be creating my broadcaster source code ...
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Turtlebot3 blob recognition

Hello everyone! Is something here who knows a site where can I learn about blob recognition for turtlebot3? Or for robots which uses Compressed images data type? I ...
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rosmsg show Num error

I'm following the ROS Tutorial ''Creating a ROS msg and srv'' and meet a problem. When I type $ rosmsg show Num It shows ...
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Understanding registerCallback() from TF MessageFilter tutorial

I'm going through the TF MessageFilter tutorial and I understand the code except for line 13: ...
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Follow the tutorial to the 'Tab Completion' and get error

Tutorial 3.5 Tab Completion: http://wiki.ros.org/ROS/Tutorials/NavigatingTheFilesystem I typed in the code below and received the error: $ roscd roscpp_tut<<< now push the TAB key >>>...
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Time travel with tf - tutorial - confusing target and source frames

Regarding the time travel with tf tutorial: http://wiki.ros.org/tf/Tutorials/Time%20travel%20with%20tf%20%28Python%29 It is stated: Give the transform from this frame, at this time ... to this frame, ...
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CMake Error in rosmsg tutorial

I am in the tutorial at CreateMsgAndSrv and got stuck at chapter 3. Running the command $ rosmsg show beginner_tutorials/Num got me the following ...
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Python versions of tutorials

In for example, http://wiki.ros.org/navigation/Tutorials/RobotSetup/Odom , example is written in C++ I assume that just about any ROS program in C++ could be written in Python. True? Is there a ...
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Strange numbers in "Create your own urdf file" URDF's tutorial

Hello! I recently started studying ROS and now I'm considering this tutorial I don't understand how the axis xyz values (from Completing the Kinematics) was calculated. The follow values are given at ...
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What should i do after tutorials

Hi everyone, I was wondering, what should i do after the firs tutorials to improve my knowledge on ROS ? is there some corrected exercise we can find on the net ? do you think it is interesting to ...
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no tutorial in Librviz: Incorporating RViz into a Custom GUI

Hi all.I want to learn how to write an application using an RViz visualization widget but the link in this page was unuseable. Could somen one give me an availble link? Thanks! Originally posted by ...
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Tutorials: package format 2 vs format 1

While I was running through the tutorial "CreatingMsgAndSrv", I ran into problems when trying to use rosmsg show beginner_tutorials/Num The terminal displayed a long error with The ...
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Question on turtlesim tutorial: Go to Goal

Hello, I am new to ROS and I am trying to implement the Go to Goal tutorial in C++ (the tutorial itself is in python but wanted to implemented it in C++). The part I am having trouble understanding is,...
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tf tutorial start_demo.launch wtf

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CMake Error - WritingPublisherSubscriber(c++)

Hello everyone, I'm new to ROS and browsing ROS tutorials I'm stuck with the problem in Writing a Simple Publisher and Subs.. tutorial. Basically I followed it till the end and finally when I want to ...
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Where do I get urdf_sim_tutorial package

I am doing this tutorial One of the instructions is to run: roslaunch urdf_sim_tutorial gazebo.launch However I do not have urdf_sim_tutorial package. I tried to ...
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cv_bridge tutorials not working

When running the example code from the cv_bridge tutorial, all I see is a small window that has captured a small portion of my screen, along with terminal output that says ...
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What are ROS projects to practice?

Hello, I am using ROS on and off on average every 6 months. To stay active however, I would like to do more projects in ROS and do more advanced stuff (since I always go back after a long break, I ...
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Moveit Tutorials step: Move_group interface Tutorial

I can not go forward in this step of the tutorial, after opening Rviz the tutorial says to insert the command: ...
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Cannot download ros-kinetic-ros-tutorials

Making my way through this guide right here. Currently running Kinetic on the Raspbian Jessie Lite, which itself is running on the Raspberry Pi 3. So I'm trying to complete the pre-requisite which is ...
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Unknown CMake command "add_action_files"

Ubuntu 14.04, ROS Indigo. I've been following along with the tutorial at: http://wiki.ros.org/ROS/Tutorials/CreatingMsgAndSrv and when I get to the portion where it instructs me to run catkin_make ...
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How can I do a GUI?

Hi, I am working on a project to create a GUI which would interact with a robot using ROS. It's something relatively new for me. I have done the beginner tutorial for ROS. Then I have seen that maybe ...
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ROS Tutorial Creating Package Command Not Found

So I'm following this ROS tutorial (http://wiki.ros.org/ROS/Tutorials/CreatingPackage) and everything is working fine until I input "roscd beginner_tutorials" at the end of section 5.1 and ...
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Unable to Locate ROS Packages?

Ok so I am completely new to ROS, and I am having some trouble with the tutorial. I managed to install from-source, but now whenever I try to download the indigo tutorial package (sudo apt-get install ...
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Unable to import custom messages (Python)

Hi There, I am following the python publisher/subscriber tutorial located here. I followed the first couple of steps to download and build the code. Then, as instructed, I started a roscore and in a ...
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ROS-I training_unit demo_manipulation fails to build

Hi, This exercise is failing to build on my system due to the following error: ...
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Problem with navigation

Hello! I am new to ROS, so please bear with me. I am going through navigation tutorials of ROS listed here. When I launch the amcl.demo file I get the following error continuously: [WARN] [1454762481....
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question about rosrun beginner_tutorials talker in Tutorials

I followed the Tutorials and built a talker.cpp and listener.cpp http://wiki.ros.org/cn/ROS/Tutorials/WritingPublisherSubscriber%28c%2B%2B%29 but when i run the command:$ rosrun beginner_tutorials ...
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fatal error: beginner_tutorials/AddTwoInts.h: No such file or directory , #include "beginner_tutorials/AddTwoInts.h"

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About ros_web_video and mjpeg_server

Hello, I know that mjpeg_server is deprecated but for curiosity i was trying to use it whit a turtlebot, I ran the commands as it follows here Wiki for mjpeg and the webpage was loading and not ...
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Connect Moveit to a robot

Hi there! I'm looking for any tutorials or any documents that show how to connect Moveit to a robot. I'm working actually on self-collision robot so I have to work with real robot using what I did on ...
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2 answers
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what are the prerequisite for ROS?

I have recently completed my Bachelors in Computer science , i have no such exposure to ROS or any thing related to it now i have been offered Internship in development in ROS should i go for it ? ...
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Configuring the layered costmap[SOLVED]

Hello, I am a newbie to ROS. I wish to use the existing implementation of layered costmap for one of my projects. I follwed the tutorials mentioned here: Configuring Layered Costmaps http://wiki.ros....
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different between gazebo and rviz

hello everyone , i am a beginner for ros and i want to simulator a robot with sensor and can send odom msgs ,i already built a simple robot model , using arbotix and rviz and i can teleop it ; to add ...
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Fusing absolute pose data

As I understand, in the robot_localization state estimation node, the differential parameter should be set to false if sensor contains absolute pose information. However, in this robot_localization ...
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1 answer
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How to solve these error messages from nav2d tutorials

Hi everyone. I try to do the tutorials from nav2D and when I run the tutirialX.launch I get these errors: ...
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Unofficial msgs tutorial - rosjava

I'm going through the rosjava tutorials, and I'm running up against problems with making unofficial messages. I followed all of the steps in section 2.1, but when I attempt to catkin_make, my build ...
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rosmsg show beginner_tutorials/Num (error???)

Hi guys I been fallowing beginner tutorial, I'm a newbie ok. So when i wrote in my terminal : $ rosmsg show beginner_tutorials/Num I got this error : ...
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Why do I get this error when catkin_make my package?

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Need help understanding urdf and tf

I've worked through the tutorials on urdf and am working through tf. I have created a urdf for my physical robot. I am striving to get my robot set up to use the Nav stack and somehow had in my mind ...
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ROS Tutorials PDF

Is there a PDF file hosted anywhere for the ROS beginner tutorials? I would like to print them out to work from and make notes, but would like to avoid printing each page individually if possible. ...
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ROS Answers SE migration: android_core

Does anyone know of any step-by-step tutorials where I can use android_core (I want to publish data from accelerometers on the phone to a robot). I can't find any that work. After spending countless ...
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I can install and build rosjava but can't run tutorials

Can someone post step by step instructions to get the rosjava pub_sub tutorial working. Working on Ubuntu, and I need it to work with Groovy. So is there anyone who can give a tutorial with step by ...
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Problem with tf tutorial

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