Andromeda's profile - activity

Maybe you missed this step?

Maybe you missed this step?

What happens, if you just try to install any other package on your Ubuntu system or upgrade it? E.g. $sudo apt update $

What happens, if you just try to install any package on your Ubuntu system? E.g. $sudo apt install vim

Take a look here: link

Run colcon without sudo: $colcon build ...

ModuleNotFoundError: No module named 'ament_package' Hi, I am getting the following error when I am trying colcon build

Can you ping the IP-addresses from both direction?

It is generally used to reference your robot (base_link) to the world. Since the world is generally a fixed frame withou

Probably because your file has the name mirla.urdf but you typed mira.urdf (without "l" in the filename)???

It is not a good idea to run it from that folder. Please note that the argument passed to the model is the path to your

About the setuptools deprecation you can find a quick workaround here. Basically you need to downgrade it. On the other

About the setuptools deprecation you can find a quick workaround here. Basically you need to downgrade it. On the other

About the setuptools deprecation you can find a quick workaround here. Basically you need to downgrade it. On the other

Yes and no. Mathematically speaking makes sense. On the other side you have to take care of the numeric instability and

Look to this answer

Maybe it is a stupid idea, but could you create 2 different python files: file #1 sources only the setup.bash file and n

Maybe it is a stupid idea, but could you create 2 different python files: file #1 sources only the setup.bash file and n

As far as I know the bash command are active in the shell, where you called them. I really do not know, how it behaves,

How do you call your script? Something like: $python3 myprog.py or like: $ros2 run mypkg myprog ???

I understand your logic, but commands like ros2 run <pkg> <prog> will never run, since ROS doesn't know, whe

I understand your logic, but commands like ros2 run <pkg> <prog> will never run, since ROS doesn't know, whe

Ok, then I have really no idea... could you try in another distro (galactic, foxy, ...)?

To be clear: ... executor.spin_once(timeout_sec=0.1) rclpy.spin_once() rate.sleep() ...

Ok, can you try the same identical code above but putting the following line: rclpy.spin_once() after executor.spin_once

To be clear: ... executor.spin_once(timeout_sec=0.1) rclpy.spin_once(self) rate.sleep() ...

To be clear: executor.spin_once(timeout_sec=0.1) rclpy.spin_once(self) rate.sleep()

Ok, can you try the same identical code above but putting the following line: rclpy.spin_once(self) after executor.spin_

Ok, can you try the same identical code above but putting the following line: rclpy.spin_once(self) after executor.spin_

Ok, can you try the same identical code above but putting the following line: rclpy.spin_once(self) after executor.spin_

http://wiki.ros.org/urdf/Tutorials

https://docs.ros.org/en/foxy/Tutorials/Intermediate/URDF/URDF-Main.html

Post please ALL the code, otherwise it is pratically impossible to help you. Furthermore, open a terminal and type ros t

Post please ALL the code, otherwise it is pratically impossible to help you. By the way: spinOnce(), if not used correct

why can not get the local velocity?? i want to get the vehicle velocity,and using velocity to control vehicle. i used r

Frames are moving away from global frame Hi everyone, I am using Hector-Slam and AMCL without IMU sensor. At the beginn

Frames are moving away from global frame Hi everyone, I am using Hector-Slam and AMCL without IMU sensor. At the beginn

I have no idea... tomorrow I have access to another PC, where I developed some programs using spin_once and I try to com

I do not know... In my humble installation, your code works without any change. What happens if you remove that line and

How do you start your node? Using ros2 run <package> <your_prog> works in my system. The line #!/usr/bin/env

First of all, you should start from the official documentation: link. Since I supposed, you want to install ROS2, I gave

Hi,

I wrote a very simple program in python to read parameters from a YAML file. The YAML file is the following:

mqtt_node:
  ros__parameters:
    variable: 9494.98

and the minimal code of the node is this one:

class mqtt_class(Node):

    def __init__(self):

        super().__init__('mqtt_class')

        print()
        print(self.get_parameter('variable')._value)   # <- here is the problem
        print()
)


def main(args = None):

    rclpy.init(args = args)

    my_publisher = mqtt_class()

    rclpy.spin(my_publisher)


    my_publisher.destroy_node()
    rclpy.shutdown()


if __name__ == '__main__':

    main()

This is the error I get:

 Traceback (most recent call last):
   File "/home/kkk/workspace/install/xxx/lib/xxx/xxx", line 11, in <module>
   load_entry_point('xxx', 'console_scripts', 'xxx')()
 File "/home/kkk/workspace/build/xxx/xxx/xxx.py", line 108, in main
  my_publisher = mqtt_class()
  File "/home/kkk/workspace/build/xxx/xxx/xxx.py", line 54, in __init__
    print(self.get_parameter('variable')._value)
   File "/opt/ros/foxy/lib/python3.8/site-packages/rclpy/node.py", line 512, in get_parameter
    raise ParameterNotDeclaredException(name)
 rclpy.exceptions.ParameterNotDeclaredException: ('Invalid access to undeclared parameter(s)', 'variable')
[ERROR] [zzzz-2]: process has died [pid 19805, exit code 1, cmd '/home/kkk/workspace/install/xxx/lib/xxx/xxx --ros-args -r __xxx:=xxx --params-file /home/kkk/workspace/install/xxx/share/xxx/params.yaml'].

What is wrong with the code?

@andya what happens, if you open a terminal and type rviz2 directly?

Without looking into your code, will be a guess...

Then accept please his answer by clicking the green check mark on the left side of his post. So you can mark this questi

Probably you should provide with version of Gazebo are you using?

Only the file setup.cfg. There you should replace the sign - with the sign _ I had many packages implemented for Foxy.