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2014-01-28 17:27:11 -0500 marked best answer Joint::GetLinkForce() gets segmentation fault

Hi,

Has anybody used Joint::GetLinkForc() or Joint::GetLinkTorque in gazebo simulator? I am using them in a gazebo plugin and these functions give me segmentation fault.

Thanks,

2014-01-28 17:26:57 -0500 marked best answer How to use a gazebo plugin

Hi,

I have written a simple gazebo world plugin and compiled it (following the tutorial). Now I am not sure how to use this plugin. I am using ROS fuerte on Ubuntu 12.0.4. Is there a tutorial to explain it? Can I simply add a plugin tag into the .world file?

Thanks,

2014-01-28 17:26:47 -0500 marked best answer what is inside your $PYTHONPATH?

Hello all,

I am trying to find a solution for the problem I have with this error message:

import rospkg ImportError: No module named rospkg

Can somebody tell me what it should be inside the $PYTHONPATH exactly? For me it is only : /opt/ros/fuerte/lib/python2.7/dist-packages

Thanks,

2014-01-28 17:26:44 -0500 marked best answer "unmet dependencies" error when installing ROS on ubuntu12.04

Hello,

I have recently upgraded to Ubunto 12.0.4 and trying to reinstall ROS (Fuerte version). I have got the following error message. Even installing each package separately doesn't help. It seems that I am stuck inside a loop of dependencies.

p.s. Still I have the old version of ROS on my computer; No idea how to get rid of it.

sudo apt-get install ros-fuerte-desktop-full Reading package lists... Done Building dependency tree
Reading state information... Done Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. The following information may help to resolve the situation:

The following packages have unmet dependencies: ros-fuerte-desktop-full : Depends: ros-fuerte-nodelet-core (= 1.6.5-s1342844070~precise) but it is not going to be installed Depends: ros-fuerte-geometry-tutorials (= 0.1.3-s1342872775~precise) but it is not going to be installed Depends: ros-fuerte-orocos-kinematics-dynamics (= 0.2.3-s1342843099~precise) but it is not going to be installed Depends: ros-fuerte-filters (= 1.6.0-s1342847409~precise) but it is not going to be installed Depends: ros-fuerte-slam-gmapping (= 1.2.7-s1342854377~precise) but it is not going to be installed Depends: ros-fuerte-simulator-gazebo (= 1.6.10-s1342860235~precise) but it is not going to be installed Depends: ros-fuerte-visualization (= 1.8.13-s1342850128~precise) but it is not going to be installed Depends: ros-fuerte-vision-opencv (= 1.8.3-s1342843578~precise) but it is not going to be installed Depends: ros-fuerte-perception-pcl (= 1.2.2-s1342844331~precise) but it is not going to be installed Depends: ros-fuerte-geometry-experimental (= 0.2.3-s1342855049~precise) but it is not going to be installed Depends: ros-fuerte-robot-model-visualization (= 0.1.2-s1342859854~precise) but it is not going to be installed Depends: ros-fuerte-common-tutorials (= 0.2.3-s1342876317~precise) but it is not going to be installed Depends: ros-fuerte-image-pipeline (= 1.8.3-s1342844697~precise) but it is not going to be installed Depends: ros-fuerte-bfl (= 0.1.0-s1342847793~precise) but it is not going to be installed Depends: ros-fuerte-diagnostics-monitors (= 1.4.3-s1342858172~precise) but it is not going to be installed Depends: ros-fuerte-common-rosdeps (= 1.2.0-s1342842909~precise) but it is not going to be installed Depends: ros-fuerte-geometry-visualization (= 0.1.1-s1342935189~precise) but it is not going to be installed Depends: ros-fuerte-image-common (= 1.8.0-s1342843441~precise) but it is not going to be installed Depends: ros-fuerte-bond-core (= 1.6.3-s1342843973~precise) but it is not going to be installed Depends: ros-fuerte-python-qt-binding (= 0.1.5-s1342848822~precise) but 0.1.5-s1342850931~oneiric is to be installed Depends: ros-fuerte-visualization-common (= 1.8.4-s1342848914~precise) but it is not going to be installed Depends: ros-fuerte-physics-ode (= 1.8.0-s1342848419~precise) but it is not going to be installed Depends: ros-fuerte-driver-common (= 1.4.0-s1342842829~precise) but it is not going to be installed Depends: ros-fuerte-executive-smach (= 1.2.0-s1342854953~precise) but it is not going to be installed Depends: ros-fuerte-stage (= 1.6.6-s1342867130~precise) but it is not going to be installed Depends: ros-fuerte-dynamic-reconfigure (= 1.4.0-s1342842723~precise) but it is not going to be installed Depends ... (more)

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2013-01-08 09:15:50 -0500 marked best answer ImportError: No module named rospkg

Hello All,

After installing ROS on my Ubuntu, I was trying to follow the tutorials under the simulator_gazebo. But I have gotten an error message for this command:

rosrun gazebo spawn_model -file `pwd`/object.urdf -urdf -z 1 -model my_object

Error message:

ImportError: No module named rospkg

Could it be from the installation? I think everything went well during the installation.

Any thoughts?

Thanks,

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2012-09-15 01:50:43 -0500 marked best answer Problem with spawn_model in gazebo

Hello,

I am trying to spawn a table and a coffee cup into the empty world of pr2 following this tutorial http://www.ros.org/wiki/pr2_simulator/Tutorials/BasicPR2Controls:

1) I Copied the table.stl to this directory `rospack find   gazebo_worlds`/Media/models/
2) I Copied the table.urdf to this directory `rospack find gazebo_worlds`/objects/
3) roslaunch pr2_gazebo pr2_empty_world.launch----> works fine.
4) rosrun gazebo spawn_model -urdf -file table.urdf -model table -x 1.0 -y 0.5 -z 0.3
5) rosrun gazebo spawn_model -gazebo -file `rospack find gazebo_worlds`/objects/coffee_cup.model -model coffee_cup -x 1.2 -z 1

The result is so weird, the table was spawned with no color(same color as the background) while I have gotten the error message: "filename referred by mesh [table.stl] does not appear to exist."

The coffee cup was shown in the list of models but there is no coffee cup in the world. And there some error messages for this command : "namespace error : Namespace prefix model on physical is not defined"

Why do I get these error messages? And if I delete one object from the world, the entire gazebo window will be closed. Why?

p.s. I am working with Fuerte ROS on Ubuntu 12.0.4

Thanks,