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How about sharing our tutorial answers?

asked 2011-10-07 02:06:13 -0500

jlo gravatar image

updated 2011-10-07 02:06:32 -0500

Hi, I just finished the questionnaire and I thought it'd be very interesting to share them to see what other possibilities there is for some answers and in that way learn a bit more about ROS.

Here are mine:

How do you find the sensor_msgs package? rospack find sensor_msgs

What is the path of the sensor_msgs package? /opt/ros/electric/stacks/common_msgs/sensor_msgs

What ROS messages are defined in the sensor_msgs package? vim manifest

msg/CameraInfo.msg msg/JointState.msg msg/PointCloud.msg msg/ChannelFloat32.msg msg/LaserScan.msg msg/PointField.msg msg/CompressedImage.msg msg/NavSatFix.msg msg/Range.msg msg/Image.msg msg/NavSatStatus.msg msg/RegionOfInterest.msg msg/Imu.msg msg/PointCloud2.msg msg/Joy.msg msg/JoyFeedback.msg msg/JoyFeedbackArray.msg

What nodes and topics are created when running roscore? /rosout

What ROS packages does the roscpp_tutorials package depend on? rospack depends roscpp_tutorials

rosbuild roslang cpp_common roscpp_traits rostime roscpp_serialization rospack roslib xmlrpcpp rosconsole std_msgs rosgraph_msgs roscpp std_srvs

alternative version: roscd roscpp_tutorials; vim manifest.xml roscpp, std_srvs, std_msgs

How do you run the talker and listener nodes in the roscpp_tutorials package? rosrun beginner_tutorials talker rosrun beginner_tutorials listener

What topic are the talker and listener nodes subscribing and publishing to? /chatter (talker publishing to and listener subscribing)

What is the message type of the topic in the previous question? std_msgs/String

How do you rename a node? __name:=<name>

What is the difference between a topic and a service? A service let's you query a node and receive a reply for it, while a topic let's you broadcast messages (nodes can subscribe to the topic).

What does rxconsole show you? rxconsole displays the messages being published to rosout.

What does roslaunch do? Allow you to initialize multiple nodes on your machine.

Cheers,

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Comments

can you add a link to the questionnaire?
Daniel Canelhas gravatar image Daniel Canelhas  ( 2011-10-07 03:02:13 -0500 )edit
David Lu gravatar image David Lu  ( 2011-10-07 05:10:41 -0500 )edit
So far there are 219 responses to the questionnaire. I can anonymize the answers and make them public if that is something that people would like.
mmwise gravatar image mmwise  ( 2011-10-07 07:58:39 -0500 )edit
I would :-)
jlo gravatar image jlo  ( 2011-10-09 20:09:06 -0500 )edit

@mmwise Can you provide us with a piece of "standard" answers?

snakeninny gravatar image snakeninny  ( 2016-06-29 01:44:39 -0500 )edit

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answered 2011-10-26 09:48:54 -0500

mmwise gravatar image

updated 2011-10-26 10:02:21 -0500

Here are the anonymous answers for ROS and TF tutorials:

https://docs.google.com/a/willowgarage.com/spreadsheet/ccc?key=0ApPOAyhQ-WtWdElOelVpbUFia05yaFdrbjVLSzhJWHc#gid=1

Here are some other stats:

Preferred programming language

image description

python  57  26%
c++     148 67%
Other   17  8%

How well do you feel you understand ROS concepts after the tutorial?

image description

Not at all.
1       0      0%
2       0      0%
3       4      2%
4       3      1%
5       9      4%
6       37     17%
7       73     33%
8       43     19%
9       53     24%  
I have a good basic understanding.
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Thanks, that's great!
jlo gravatar image jlo  ( 2011-10-26 20:16:27 -0500 )edit

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Asked: 2011-10-07 02:06:13 -0500

Seen: 787 times

Last updated: Oct 26 '11