id stringlengths 15 54 | text stringlengths 3 133k | title stringclasses 1
value |
|---|---|---|
ros_instantiate/reading20msgs20from2_26.txt | Notice that there are 30 messages published on topic ` /obs1/gps/fix ` , and
40 on topic ` /diagnostics_agg ` . Let's just extract those. | |
ros_instantiate/readmessageshtml_76.txt | Return certain message properties as a time series. | |
ros_instantiate/Commandline_174.txt | ` -q ` , ` --quiet ` | |
ros_instantiate/Commandline_161.txt | * Suppress noncritical messages.
$ rosbag compress -q *.bag | |
ros_instantiate/readmessageshtml_20.txt | * readMessages
* On this page
* Syntax
* Description
* Examples
* Return ROS Messages as a Cell Array
* Read Messages from a rosbag as a Structure
* **Create rosbag Selection Using** **` rosbagreader ` ** **Object**
* Input Arguments
* bag
* rows
* Output Arguments
* msg... | |
ros_instantiate/Commandline_103.txt | * ` --skip-empty=SEC `
* Skip regions in the bag with no messages for more than SEC seconds.
$ rosbag play --skip-empty=1 recorded1.bag | |
ros_instantiate/Commandline_8.txt | * [ Login ](/action/login/rosbag/Commandline?action=login) | |
ros_instantiate/Commandline_32.txt | ` -h ` , ` --help ` | |
ros_instantiate/readmessageshtml_7.txt | [ Help Center ](../../index.html) [ Help Center ](../../index.html) | |
ros_instantiate/pythonapirosbagwrite_50.txt | [ 
](/users/71807/asdewar/) [ Asdewar ](/users/71807/asdewar/) ( 2021-03-25
10:48:23 -0500 ) edit | |
ros_instantiate/reading20msgs20from2_8.txt | * [ Login ](/action/login/rosbag/Tutorials/reading%20msgs%20from%20a%20bag%20file?action=login) | |
ros_instantiate/Commandline_158.txt | ` -f ` , ` --force ` | |
ros_instantiate/Commandline_99.txt | * ` -d SEC ` , ` --delay=SEC `
* Sleep SEC seconds after every advertise call (to allow subscribers to connect).
$ rosbag play -d 5 recorded1.bag | |
ros_instantiate/reading20msgs20from2_70.txt | ...and here is the full output: | |
ros_instantiate/Commandline_186.txt | ` -q ` , ` --quiet ` | |
ros_instantiate/Commandline_93.txt | * ` -q ` , ` --quiet `
* Suppress console output.
$ rosbag play -q recorded1.bag | |
ros_instantiate/pythonapirosbagwrite_35.txt | If it's a custom message as part of a third-party package, the message
generation should happen automatically when you build/install that package. To
check if it's installed properly and ROS can find it, you can run ` rosmsg
show <package_name>/<msg_name> ` in a terminal. In this case, it would be: | |
ros_instantiate/Commandline_66.txt | * Record all topics subscribed to by a specific node
$ rosbag record --node=/joy_teleop | |
ros_instantiate/reading20msgs20from2_74.txt | 1. Because ` rostopic ` is **extremley slow!** This command, running on a fast computer (4-core/8-thread Pentium i7 w/m.2 SSD), for instance, takes **11.5 minutes** to read an 18 GB bag file!
time rostopic echo -b large_bag_file.bag /topic1 | |
ros_instantiate/Commandline_3.txt | # Wiki | |
ros_instantiate/Commandline_94.txt | * ` -i ` , ` --immediate `
* Play back all messages without waiting.
$ rosbag play -i recorded1.bag | |
ros_instantiate/readmessageshtml_102.txt | ## MATLAB Command | |
ros_instantiate/reading20msgs20from2_63.txt | The ` rg 'key: "piksi_' topics.yaml ` part searches the "topics.yaml" text
file for the ` 'key: "piksi_' ` string, the ` sort -V ` part sorts all of the
output lines, and the ` awk '!seen[$0]++' ` part removes duplicate entries, so
that you only see one line of each match. | |
ros_instantiate/pythonapirosbagwrite_7.txt | [ ALL ](/questions/scope:all/sort:activity-desc/page:1/) [ UNANSWERED
](/questions/scope:unanswered/sort:answers-asc/page:1/) | |
ros_instantiate/Commandline_40.txt |
$ rosbag record -e "(.*)sensors(.*)" | |
ros_instantiate/Commandline_74.txt | ## rosbag info | |
ros_instantiate/pythonapirosbagwrite_24.txt | [ 
](/users/33908/tryan/) [ tryan ](/users/33908/tryan/) ( 2021-03-16 20:04:01
-0500 ) edit | |
ros_instantiate/pythonapirosbagwrite_71.txt | [ URDF model using the a variable parameter ](/question/361766/urdf-model-
using-the-a-variable-parameter/) | |
ros_instantiate/readmessageshtml_100.txt | ## See Also | |
ros_instantiate/readmessageshtml_65.txt |
xPoints = cellfun(@(m) double(m.X),msgStructs);
yPoints = cellfun(@(m) double(m.Y),msgStructs);
plot(xPoints,yPoints) | |
ros_instantiate/readmessageshtml_21.txt | * Documentation
* [ Examples ](../examples.html?category=ros-bag-file-logging-and-analysis&s_tid=CRUX_topnav)
* [ Functions ](../referencelist.html?type=function&category=ros-bag-file-logging-and-analysis&s_tid=CRUX_topnav)
* [ Blocks ](../referencelist.html?type=block&category=ros-bag-file-logging-and-analysi... | |
ros_instantiate/pythonapirosbagwrite_11.txt | * [ melodic ](/questions/scope:all/sort:activity-desc/tags:melodic/page:1/) | |
ros_instantiate/readmessageshtml_119.txt | ### Asia Pacific | |
ros_instantiate/pythonapirosbagwrite_43.txt | * * | |
ros_instantiate/Commandline_183.txt | * Write to directory DIR.
$ rosbag reindex --output-dir=reindexed *.bag | |
ros_instantiate/reading20msgs20from2_27.txt | 2. In terminal 1 (this terminal, for example), start up a ros core, which runs the required ROS master node:
roscore | |
ros_instantiate/reading20msgs20from2_66.txt | ### Example 2: | |
ros_instantiate/readmessageshtml_63.txt | Extract the _xy_ points from the messages and plot the robot trajectory. | |
ros_instantiate/readmessageshtml_55.txt | ### Read Messages from a rosbag as a Structure | |
ros_instantiate/Commandline_59.txt |
$ rosbag record -b 1024 /chatter | |
ros_instantiate/Commandline_91.txt | * ` -h ` , ` --help `
* Show the usage and exit.
$ rosbag play -h | |
ros_instantiate/pythonapirosbagwrite_72.txt | [ ros::Rate::sleep() equivalent in rosserial ](/question/344793/rosratesleep-
equivalent-in-rosserial/) | |
ros_instantiate/pythonapirosbagwrite_76.txt | Please note: ROS Answers requires javascript to work properly, please enable
javascript in your browser, [ here is how
](https://www.google.com/support/bin/answer.py?answer=23852) | |
ros_instantiate/readmessageshtml_87.txt | ROS message data, returned as an object, cell array of message objects, or
cell array of structures. Data comes from either the ` BagSelection ` object
created using [ ` rosbag ` ](rosbag.html) or the ` rosbagreader ` object. | |
ros_instantiate/readmessageshtml_77.txt |
ts = timeseries(bagMsgs2,...
'Pose.Pose.Position.X', ...
'Twist.Twist.Angular.Y')
timeseries
Timeseries contains duplicate times.
Common Properties:
Name: '/odom Properties'
Time: [99x1 double]
TimeInfo: tsda... | |
ros_instantiate/Commandline_162.txt | * * ` -j ` , ` --bz2 `
* Use BZ2 to compress data.
$ rosbag compress -j *.bag | |
ros_instantiate/readmessageshtml_16.txt | Off-Canvas Navigation Menu Toggle | |
ros_instantiate/readmessageshtml_12.txt | MathWorks | |
ros_instantiate/pythonapirosbagwrite_36.txt |
rosmsg show dvs_msgs/Event
| |
ros_instantiate/readmessageshtml_69.txt | Load a rosbag log file and parse out specific messages based on the selected
criteria. | |
ros_instantiate/Commandline_115.txt | * ` check <bag-file> `
* Determine whether or not a bag is playable in the current system.
$ rosbag check old.bag | |
ros_instantiate/pythonapirosbagwrite_39.txt | Once the headers are available, you can use the message just like any other.
Here's the ` Event ` message added to the [ ` rosbag ` Python API example
](http://wiki.ros.org/rosbag/Code%20API#Python_API) : | |
ros_instantiate/readmessageshtml_58.txt |
bag = rosbag('ros_turtlesim.bag'); | |
ros_instantiate/reading20msgs20from2_23.txt | Sample output: | |
ros_instantiate/pythonapirosbagwrite_30.txt | [ **answered 2021-03-17 08:54:13 -0500 ** ](/answers/374173/revisions/) | |
ros_instantiate/reading20msgs20from2_31.txt | 4. Open up another terminal. Subscribe to the other topic: ` /diagnostics_agg ` .
rostopic echo /diagnostics_agg | tee topic2.yaml | |
ros_instantiate/reading20msgs20from2_67.txt | Let's search for all key data entries which begin with "GPS", "Duration", or
"Minimum". "OR" type regular expression searches take the general format: `
(str1|str2|str3|etc) ` , with ` | ` being read as "or" in this case. So,
searching for "GPS", "Duration", or "Minimum" can be done with the following
regular expressio... | |
ros_instantiate/pythonapirosbagwrite_38.txt |
uint16 x
uint16 y
time ts
bool polarity
| |
ros_instantiate/reading20msgs20from2_37.txt | You'll see: | |
ros_instantiate/Commandline_139.txt | * time of message. The time is represented as a [ rospy ](/rospy) [ Time ](http://pr.willowgarage.com/pr-docs/ros-packages/rospy/html/classrospy_1_1msg_1_1Time.html) object ( ` t.secs ` , ` t.nsecs ` ) | |
ros_instantiate/readmessageshtml_56.txt | [ Open Live Script
](matlab:openExample\('ros/ReadMessagesFromARosbagAsAStructureROSExample'\)) | |
ros_instantiate/Commandline_150.txt | A backup of each bag file (with the extension ` .orig.bag ` ) is made before
the bag is compressed. If the backup file already exists (and the ` -f `
option isn't specified) then the tool will not compress the file. | |
ros_instantiate/readmessageshtml_38.txt | ` ` msgs ` = readMessages( ` bag ` , ` rows ` ) ` returns data from messages
in the rows specified by ` rows ` . The range of the rows is [1, `
bag.NumMessages ` ]. | |
ros_instantiate/reading20msgs20from2_3.txt | # Wiki | |
ros_instantiate/readmessageshtml_23.txt | Resources | |
ros_instantiate/Commandline_69.txt | * ` --lz4 `
* Use LZ4 compression. See [ compress ](/rosbag/Commandline#compress) for details.
$ rosbag record --lz4 /chatter | |
ros_instantiate/Commandline_51.txt | ` -O NAME ` , ` --output-name=NAME ` | |
ros_instantiate/Commandline_176.txt | ## rosbag reindex | |
ros_instantiate/pythonapirosbagwrite_75.txt | [ Powered by Askbot version 0.10.2 ](http://askbot.com) | |
ros_instantiate/Commandline_121.txt | * Append to the end of an existing bag migration rule file after loading.
$ rosbag check -a -g all.bmr diag.bag | |
ros_instantiate/readmessageshtml_127.txt | _Join the conversation_ | |
ros_instantiate/readmessageshtml_27.txt | Read messages from rosbag | |
ros_instantiate/readmessageshtml_103.txt | You clicked a link that corresponds to this MATLAB command: | |
ros_instantiate/readmessageshtml_126.txt | * [  ](https://www.facebook.com/MATLAB)
* [  ](https://twitter.com/MATLAB)
* [  ](https://www.instagram.... | |
ros_instantiate/Commandline_116.txt | ` -h ` , ` --help ` | |
ros_instantiate/reading20msgs20from2_46.txt | 2. Determine the _exact_ topic names you'd like to read from the bag file, by using ` rosbag info ` , as shown in Step 1 of Option 1 above. | |
ros_instantiate/Commandline_25.txt | * [ decompress ](/rosbag/Commandline#decompress)
* Decompress one or more bag files. | |
ros_instantiate/reading20msgs20from2_5.txt | # Page | |
ros_instantiate/readmessageshtml_104.txt | Run the command by entering it in the MATLAB Command Window. Web browsers do
not support MATLAB commands. | |
ros_instantiate/Commandline_7.txt | # User | |
ros_instantiate/readmessageshtml_91.txt | [ expand all ](javascript:void\(0\);) | |
ros_instantiate/reading20msgs20from2_81.txt | * * * | |
ros_instantiate/reading20msgs20from2_73.txt | Answer: | |
ros_instantiate/Commandline_39.txt | Record all topics that contain ` sensors ` in their name: | |
ros_instantiate/pythonapirosbagwrite_68.txt | [ ROS TCP Connector C# Lost Publishers & Freezing ](/question/417733/ros-tcp-
connector-c-lost-publishers-freezing/) | |
ros_instantiate/pythonapirosbagwrite_77.txt | [ ![ gravatar image]() ]() [ ]() ( 2024-04-18 18:36:16 -0500 ) edit | |
ros_instantiate/pythonapirosbagwrite_69.txt | [ Source for downloading rosbag files containing pointclouds
](/question/282981/source-for-downloading-rosbag-files-containing-
pointclouds/) | |
ros_instantiate/Commandline_89.txt | Additionally, during playing, you can pause at any time by pressing space.
When paused, you can step through messages by pressing ` s ` . | |
ros_instantiate/pythonapirosbagwrite_47.txt | If you don't want to use ROS, why not just use the lower-level library for
your device (libcaer, I think) instead of ROS messages and bag files, which
have inherent dependencies on ROS components? | |
ros_instantiate/Commandline_1.txt | #### ROS 2 Documentation | |
ros_instantiate/Commandline_111.txt | * ` --rate-control-topic=RATE_CONTROL_TOPIC `
* watch the given topic, and if the last publish was more than ` <rate-control-max-delay> ` ago, wait until the topic publishes again to continue playback | |
ros_instantiate/Commandline_182.txt | ` --output-dir=DIR ` | |
ros_instantiate/pythonapirosbagwrite_34.txt | To use your own custom message, you have to tell ROS about it when you build
your package. More specifically, ROS needs to generate the message headers and
put them in the proper location (depends on build tool). The [ Creating a Msg
and Srv tutorial
](http://wiki.ros.org/ROS/Tutorials/CreatingMsgAndSrv#Creating_a_msg)... | |
ros_instantiate/Commandline_62.txt |
$ rosbag record --chunksize=1024 /chatter | |
ros_instantiate/classrosbag11Message_0.txt | * [ rosbag ](namespacerosbag.html)
* [ MessageInstance ](classrosbag_1_1MessageInstance.html)
Public Member Functions | Private Member Functions | Private Attributes |
Friends | [ List of all members ](classrosbag_1_1MessageInstance-
members.html)
rosbag::MessageInstance Class Reference
A class pointing into ... | |
ros_instantiate/readmessageshtml_35.txt | [ example ](readmessages.html#buqn1u_-1) | |
ros_instantiate/reading20msgs20from2_2.txt | The ROS Wiki is for ROS 1. Are you using ROS 2 ( [ Humble
](http://docs.ros.org/en/humble/) , [ Iron ](http://docs.ros.org/en/iron/) ,
or [ Rolling ](http://docs.ros.org/en/rolling/) )?
[ Check out the ROS 2 Project Documentation ](http://docs.ros.org)
Package specific documentation can be found on [ index.ros.org
... | |
ros_instantiate/Commandline_46.txt | * Suppress console output.
$ rosbag record -q /chatter | |
ros_instantiate/Commandline_54.txt | * Split the bag when maximum size or duration is reached
$ rosbag record --split --size=1024 /chatter
$ rosbag record --split --duration=30 /chatter
$ rosbag record --split --duration=5m /chatter
$ rosbag record --split --duration=2h /chatter | |
ros_instantiate/reading20msgs20from2_64.txt | Command and output: |
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