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2017-02-09 13:22:44 -0500 | answered a question | ¿How can i get the exact date and hour of an event? The time is in Unix time, seconds since 1970. You can transform it to a more readable format with the functions in |
2016-12-15 01:51:46 -0500 | commented question | Do you have an estimate of how many developers are using ROS? I've heard @Brian Gerkey use 100,000 as an estimate of total users. This is consistent with downloads to unique IPs, and probably way more than the number of actual developers contributing to the code base. |
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2015-06-02 00:18:04 -0500 | commented answer | to input data from a csv file in cpp |
2015-06-02 00:12:23 -0500 | answered a question | How to write to a file using roslaunch (Python) When you run it with roslaunch, it's running in a different environment and (probably) trying to write the file somewhere else in the file system (and probably somewhere you don't have permissions). In Python, try opening the file with it's full pathname (probably starting with /home) and see if that works. If it does, then that's your problem. |
2015-03-18 14:36:17 -0500 | received badge | ● Nice Answer (source) |
2015-01-08 10:34:07 -0500 | answered a question | Best implementation of robot state control smach is probably the best option. It's not currently under development, but it works well, and and covers exactly what you want to do. |
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2014-07-28 18:48:09 -0500 | answered a question | What is the meaning of the nine dots? The story that I know is that it's a mounting hole pattern. If you look at the PR2 robot, there are mounting plates on the sides of the "neck" and on the top of the head, where you can bolt on extra hardware. This makes the robot more versatile, since you can add stuff to it. The ROS pattern is meant to be a visualization of these mounting holes, with the implication that ROS is also versatile, and that you can add extra stuff onto it. Someone from the early Willow Garage days might be able to confirm this or, alternatively, tell me that I'm making things up. |
2014-07-25 10:10:41 -0500 | received badge | ● Nice Answer (source) |
2014-07-24 12:53:44 -0500 | answered a question | Limit linear velocity Write another node the subscribes to the Twist message, enforces any limits you want to set (such as maximum speed), and then publishes the new, modified Twist. Have this node subscribe to the topics published by your original node, and publish to the lower-level drivers for the wheelchair. |
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2014-07-22 14:21:19 -0500 | commented question | RVIZ in Hydro slows down when displaying point cloud from Kinect Are you using the proprietary nVidia drivers? |
2014-07-22 12:44:12 -0500 | answered a question | Very slow when rviz the kinect The most likely cause is that you're not using hardware accelerated video drivers. Rviz works best with nVidia graphics cards and the propriety driver. My guess is that you're using software rendering (as opposed to taking advantage of the hardware on the GPU), and that this is what's causing the slow-down. I'd suggest that you make sure you're using hardware-accelerated video drivers, and see if that helps. The best long-term solution, though, is probably to switch to an nVidia video card. |
2014-07-21 02:12:17 -0500 | commented answer | What means 'ground truth' ... Technically, no sensor can give you ground truth, since they're making measurements, but good ones (like the ones Austin mentions) can give you measurements that are close enough to ground truth that they can be treated as being such. |
2014-07-21 02:10:41 -0500 | commented answer | What means 'ground truth' I'll quibble with Austin's definition a little. Ground truth is the actual information that you're trying to estimate with a sensor. For odometry, it's the actual position of the robot, delivered by a simulation or estimated (with high accuracy) by high-accuracy sensors... |
2014-06-17 23:44:01 -0500 | commented answer | Why publish if no one is subscribing? Where's it being sent to? All the information travels over TCP sockets, which need a process on each end. |
2014-05-08 19:19:52 -0500 | received badge | ● Nice Answer (source) |
2014-05-08 13:16:02 -0500 | commented question | How to find a node type during runtime A related thought: what are the ramifications of rewriting rosrun to use the roslaunch machinery, rather than just exec'ing the node (other then automatically starting up a core if one isn't already running)? |
2014-05-08 13:12:08 -0500 | commented question | How to find a node type during runtime A bit of background: we're trying to automatically record which nodes are being run. We've instrumented roslaunch (minimally) to do this, but we're looking for a similarly minimal way to do this with rosrun. |
2014-01-28 17:28:07 -0500 | marked best answer | rospy Subscriber object not getting destroyed? This just came up in an assignment that I'm grading, and I can't figure out why it works. In the constructor of a class, there is:
followed immediately by
My understanding is that, when Any Python gurus out there with any insight? I could guess about the object not getting reaped, but it should still go out of scope (and get destroyed), right? |
2013-12-15 06:17:09 -0500 | commented answer | ROS related very basic question. Perhaps a more useful way of thinking about ROS is that it's like POSIX for robots. A set of abstractions, communications mechanisms, and a way to interact with the underlying hardware without needing to know the exact details of this hardware. This is an analogy that Brian Gerkey came up with, |
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2013-12-05 03:47:08 -0500 | answered a question | how can I register a Callback when using ros::spinOnce ? Another way to do it would be to split the GUI elements into their own node, which would publish control messages (or issue service calls) to the node that does the work. Since the GUI node wouldn't subscribe to anything, it wouldn't need a |
2013-11-05 18:01:03 -0500 | commented answer | C++ compiler crashed You should use whatever graphical package manager your distribution supports to reinstall g++. That should replace all of the compiler files to their original state. |
2013-11-04 14:42:31 -0500 | commented answer | C++ compiler crashed Try reinstalling the compiler, perhaps, to make sure that your files are correct? |
2013-11-03 22:53:54 -0500 | commented answer | C++ compiler crashed Randomly, I noticed that the code claims to be a header file (.hpp), but the error was generated by a source file (.cpp). Shouldn't make a difference for your error, though. |
2013-11-03 22:51:09 -0500 | commented answer | C++ compiler crashed Hmmm. It seems that the error is being triggered by the inclusion of ros.h, which is odd, since it's the first real line of code. Can you compile other things that include ros.h? |
2013-11-03 16:49:05 -0500 | answered a question | C++ compiler crashed You should never, ever edit the system files, especially for the compiler. The problem is probably being caused by some line before line 13 in your Don't forget to undo your changes to the system file. |
2013-10-31 07:36:17 -0500 | received badge | ● Nice Answer (source) |
2013-10-24 05:33:16 -0500 | answered a question | what is the simplest method of extracting a 2D map file from the scenario? Take a look at the slam_gmapping tutorial. |
2013-10-03 23:40:33 -0500 | received badge | ● Great Answer (source) |
2013-09-17 12:54:50 -0500 | answered a question | need help understanding tf When you publish a new frame, you have to specify how it relates to an existing frame, by giving an offset and a quaternion rotation. sentTransform takes a StampedTransform as an argument. The StampedTransform consists of a timestamp, a transform, a frame, and a child frame. The transform tells you how to get from the frame to the child frame. This is the information that TF needs to do its job. |
2013-09-11 03:49:42 -0500 | received badge | ● Nice Answer (source) |
2013-09-10 12:17:26 -0500 | answered a question | subscribe and publish - doesn't work properly
Similar problem to this question, although it was about a subscriber, not a publisher. |