ros | operating system | Robotics library

 by   ros Python Version: 1.15.8 License: BSD-3-Clause

kandi X-RAY | ros Summary

kandi X-RAY | ros Summary

ros is a Python library typically used in Automation, Robotics applications. ros has no bugs, it has no vulnerabilities, it has a Permissive License and it has high support. However ros build file is not available. You can download it from GitHub.

Robot Operating System (ROS).

            kandi-support Support

              ros has a highly active ecosystem.
              It has 2322 star(s) with 718 fork(s). There are 204 watchers for this library.
              It had no major release in the last 6 months.
              There are 18 open issues and 109 have been closed. On average issues are closed in 76 days. There are 5 open pull requests and 0 closed requests.
              It has a negative sentiment in the developer community.
              The latest version of ros is 1.15.8

            kandi-Quality Quality

              ros has 0 bugs and 0 code smells.

            kandi-Security Security

              ros has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.
              ros code analysis shows 0 unresolved vulnerabilities.
              There are 0 security hotspots that need review.

            kandi-License License

              ros is licensed under the BSD-3-Clause License. This license is Permissive.
              Permissive licenses have the least restrictions, and you can use them in most projects.

            kandi-Reuse Reuse

              ros releases are not available. You will need to build from source code and install.
              ros has no build file. You will be need to create the build yourself to build the component from source.
              Installation instructions are not available. Examples and code snippets are available.

            Top functions reviewed by kandi - BETA

            kandi has reviewed ros and discovered the below as its top functions. This is intended to give you an instant insight into ros implemented functionality, and help decide if they suit your requirements.
            • Run a test
            • Create test results
            • Start coverage tests
            • Return the path to the XML results file
            • Read test results
            • Main entry point
            • Generate summary output
            • Recursively build a package
            • Returns the dependencies of a package
            • Load a package
            • Load message definitions from a string
            • Create a summary summary summary
            • Generate coverage reports
            • Return the full path to the test results file
            • Creates a test suite
            • Entry point for RosPack
            • Reads results from the test results directory
            • Creates test results
            • Compute the full text of the dependencies
            • Resolve a type
            • Kill a process
            • Run the build loop
            • Read test result
            • Load messages from a string
            • Read a ROS handshake header from the socket
            • Find the location of a ROS location
            • Purge files from the system
            • Load dependencies for a given package
            Get all kandi verified functions for this library.

            ros Key Features

            No Key Features are available at this moment for ros.

            ros Examples and Code Snippets

            No Code Snippets are available at this moment for ros.

            Community Discussions


            How to subscribe to two image topics in ROS using Python
            Asked 2022-Apr-04 at 09:17

            I am trying to read left and right camera images from a vehicle to do some image processing. I am unsure of how to use the same callback function to process each image. I have seen examples where the data type was different, but not where both are of the same type, such as images. In this example, separate callbacks were used.

            Here is my current attempt:



            Answered 2022-Apr-04 at 09:17

            Each node needs to initialize itself first before it can interact with the ROS network using rospy.init_node().

            Also, you need to provide two message_filter.Subscriber instead of rospy.Subscriber to the message_filter.ApproximateTimeSynchronizer. Finally, instead of setting the callback for each subscriber you should set it once for the ApproximateTimeSynchronizer using registerCallback.

            Here is a working example:



            Confusion on deploying Drake based software to a real robot
            Asked 2022-Apr-03 at 16:02

            I have limited experience in drake and currently trying to learn and implement some simple algorithms. The code I have is based on an example from the Underactuated Robotics course by R. Tedrake. The code is a slightly modified version of this example here, where the goal is to design a Lyapanuv Control Function for the unicycle robot model.

            To simulate the robot model, an instance of SymbolicVectorSystem from drake is used.

            As I understand this is just a building block for the "prototyping" and designing a suitable controller, is this correct?, is SymbolicVectorSystem still needed if there is a real robot?.

            Now that I am happy with the controller, I would like to deploy this controller to a ROS2 robot. For that, I have written a simple script that subscribes to the current robot states from the localization system that I have. I am not really sure how to proceed from here, I think I need to connect the received robot state messages to the input of the controller, then publish the output of the controller back to the robot. The problem is I couldn't find any examples that suit this use case.

            An approach I think of, could be that I create another class that inherits from VectorSystem, and this class wraps the ros stuff to subscribe publish ROS messages. In overridden DoCalcVectorOutput function of my wrapper class, I assign/retrieve the I/O and publish retrieved control commands. Finally, I connect the I/O of controller and wrapper classes with a DiagramBuilder

            I am not sure if this will work, or if this is will be the recommended approach, I will appreciate your help.

            Here is what the current code looks like;



            Answered 2022-Apr-03 at 16:02

            The code is a slightly modified version of this example here [...]

            Unfortunately, this is not accessible to me (I'm not sure if this is your drive, or if the transition to DeepNote changed things). Can you post a link directly to the course notes? e.g.

            As I understand this is just a building block for the "prototyping" and designing a suitable controller, is this correct?, is SymbolicVectorSystem still needed if there is a real robot?.

            The choice is ultimately up to you and your application. SymbolicVectorSystem may express what you need initially, but your needs may extend beyond what it can (easily) express.

            Now that I am happy with the controller, I would like to deploy this controller to a ROS2 robot. [...]

            There are a few examples of this using the Systems Framework, some in Drake proper, others in downstream projects, but understandably it may be hard to locate them.

            Some examples in Drake itself, though using LCM, not ROS2, though:

            Some examples in downstream projects; also primarily using LCM:

            As a small side note, some of us at TRI, w/ help from OpenRobotics, are (slowly) developing some ROS2 interfaces for Drake; you can see some of the progress here:
            Some caveats:

            • This is very experimental and has not yet been vetted (to any extent) on our side.
            • Our primary customer is ourselves in this case, so it may not fit your use case well at this point in time.



            Could NOT find Boost (missing: python3) (found version "1.76.0") - CMake Windows
            Asked 2022-Mar-30 at 15:49

            I need help solving this cmake boost python3 find problem when trying to compile cv_bridge from ros2, which uses a build tool called colcon and in turn CMake. The colcon build error message:



            Answered 2021-Dec-08 at 13:20

            I was able to solve it (after a few days of suffering) using precompiled Boost 1.74 and by changing the boost/python related parts of cv_bridge/CMakeLists.txt to:



            ros::Publisher: command not found? | ROS Melodic | Ubuntu 18.04
            Asked 2022-Mar-15 at 09:42

            I facing an issue while running a .cpp file, cleaner_bot.cpp (shown below) through ros run. Here are the following details:



            Answered 2022-Mar-15 at 09:42

            You should not (ros)run the source files of your project but rather the executable created by catkin_make.

            For example:



            ROS-server client srv not printing uint8
            Asked 2022-Mar-07 at 14:33

            So I am learning ROS and I am having an issue in writing a simple service client code.

            The srv_server.cpp is:



            Answered 2022-Mar-07 at 14:33

            Since it is a uint8 on the ROS side, it's actually being saved as a char when it hits c++ code. This means you're trying to print out the ASCII value of of your age field. Instead you should convert the value directly to an int when printing like:



            How to use ROS services and serial comunication with posix and semahrores in C++?
            Asked 2022-Feb-22 at 11:43

            Im new to Concurrency and parallelism programming in C/C++ so I need some help woth my project.

            I want to run multiple process using POSIX and Semaphores in C++. So the structure of the program should be the following one. First I Open Serial port (Serial communication of the Raspberry PI 4). While the Serial is Open Two processes are running

            First one, the main one run automatically and do the following: The thread ask for ODOM Updates(Pressure and IMU from the microcontroller) and Publish them. Also every 0.3 seconds check the modem inbox and if something new it publish.

            The other one only on DEMAND from ROS Services detect that there is new message in the modem inbox do HALT( on the first main Process) and execute (publish) on the serial Port. Then the first process resume with normal work

            So I trying to do first some pseudo C++ code that looks like these But I need help as Im new to Concurrency and parallelism. Here it is



            Answered 2022-Feb-22 at 11:43

            Fortunately, ROS lets you decide what threading model you want to use (

            You could use the ros::AsyncSpinner for that:

            Your main thread starts the AsyncSpinner that runs in the background, listens to ROS messages, and calls your ROS callback functions in its own threads.

            Then, your main thread cares about your serial port connection and forwards/publishes messages. In pseudo-code, it could look as follows:



            ROS Problem: cannot open shared object file: No such file or directory
            Asked 2022-Jan-26 at 18:25

            When I run



            Answered 2022-Jan-24 at 10:49

            I use this method, from

            The key point is to be sure to find the location of your libQtCore, and don't copy others' answers directly.

            You could try:



            When running yocto runqemu the ip seems not to be found
            Asked 2022-Jan-25 at 08:44

            I have built a yocto image (just for reference see the end of this question) when I try to run it with runqemu I get the following error:



            Answered 2022-Jan-25 at 08:44

            this is actually complaining about the "ip" command not being found, not your IP address, you need to install it.

            Depending on your distribution the package name may change, but for Ubuntu/Debian the package you need is iproute2



            Will bad camera calibration affect pixel coordinates?
            Asked 2022-Jan-21 at 23:46

            I am working with Turtlebots and ROS, and using a camera to find the pixel positions of a marker in the camera. I've moved over from simulations to a physical system. The issue I'm having is that the pixel positions in my physical system did not match the pixel positions in the physical system despite the marker and everything else being in the same position as in the simulations. There was a shift in the vertical pixel position by about 40 pixels when everything else like the height between the camera and marker, the marker position, and the distance between the marker and camera were the same in both the physical and simulated system. The simulated system does not need a camera calibration matrix, it is assumed to be ideal.

            The resolution I'm using is 640x480, so the center pixels should be cx=320 and cy=240, but what I noticed in the camera calibration matrix I was using in the physical system was that the cx was around 318, which is pretty accurate, but the cy was around 202, which is far from what it should be. This also made me think that the shift in pixel positions in the vertical direction is shifted with about the same amount of pixels that I'm getting as an error.

            So is it right to assume that the error in the center pixel in the calibration could be causing the error in the pixel positions?

            I have been trying to calibrate a USB camera (Logitech C920 I think) and I've been using the camera_calibrator ROS package found here to calibrate the camera. I think the camera calibration did not go that well, seeing as I always have a pretty big error in either cx or cy. Here are the calibration matrices.

            First calibration matrix, used 15x10 vertices with size 0.25

            Recalibrated but did not actually use this yet, calibrated with 8x6 size 0.25

            Same as previous, some difference between the two

            The checkerboards were on A4 papers.

            Thanks in advance.



            Answered 2022-Jan-21 at 23:46

            I believe the answer to your question is to answer how to perform a better camera calibration.

            Quoting from enter link description here:

            • Choose the right size calibration target.
            • Perform calibration at the approximate working distance (WD) of your final application.
            • The target should have a high feature count.
            • Collect images from different areas and tilts.
            • Use good lighting.
            • Calibration is only as accurate as the calibration target used. Use laser or inkjet printed targets only to validate and test.
            • Per sample, proper mounting of calibration target and camera.
            • Remove bad observations. Carefully inspect reprojection errors.
            • Obtaining a low re-projection error does not equal a good camera calibration. Be careful of over fitting.



            ROS cpp callback without message type
            Asked 2022-Jan-19 at 15:06

            I want to create a ROS node that is able to listen to a topic without knowing its message type. In python, this is possible as can be seen here:


            I tried that and it works like a charm. However, I want to avoid copying the whole message; thus, i need that functionality in a roscpp nodelet.



            Answered 2022-Jan-19 at 15:06

            By nature, this sort of problem is very pythonic and much harder to work around in c++. That being said, there is one (sort of) solution out there already. Take a look at the ros_msg_parser.

            The syntax isn't pretty, and I'm not even sure if it's a good idea, but it will let you generate generic subscribers. Example from the linked repo:


            Community Discussions, Code Snippets contain sources that include Stack Exchange Network


            No vulnerabilities reported

            Install ros

            You can download it from GitHub.
            You can use ros like any standard Python library. You will need to make sure that you have a development environment consisting of a Python distribution including header files, a compiler, pip, and git installed. Make sure that your pip, setuptools, and wheel are up to date. When using pip it is generally recommended to install packages in a virtual environment to avoid changes to the system.


            For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .
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