Attention: Answers.ros.org is deprecated as of August the 11th, 2023. Please visit robotics.stackexchange.com to ask a new question. This site will remain online in read-only mode during the transition and into the foreseeable future. Selected questions and answers have been migrated, and redirects have been put in place to direct users to the corresponding questions on Robotics Stack Exchange. Additional details are available here.

Arrays Ros Launch File

asked 2015-03-28 16:38:56 -0500

atp
529 ●47 ●56 ●67

How can I get a list of values from a ROS launch file? My launch file includes the following line:

<param name="workspace" value="[0.55, 0.9, -0.4, 0.4, -0.25, 2]" />

In C++, I try loading that array, but it does not work (the variable workspace just always gets set to the constant WORKSPACE)

std::vector<double> workspace;
node.param("workspace", workspace, std::vector<double>(WORKSPACE, WORKSPACE + sizeof(WORKSPACE) / sizeof(WORKSPACE[0])));

edit retag flag offensive close merge delete

add a comment

1 Answer

Sort by » oldest newest most voted

answered 2015-03-28 17:34:17 -0500

aak2166

593 ●12 ●18 ●24

I assume node is your NodeHandle object? Why use that notation rather than node.getParam("workspace", workspace) ?

edit flag offensive delete link

Comments

This is correct (as far as I know) -- vectors and maps both require the getParam call. See the Parameter Server Overview wiki.

kramer ( 2015-03-28 17:40:29 -0500 )edit

I have tried getParam but it does not get the value from the launch file. Is the syntax in the launch file correct?

atp ( 2015-03-28 19:17:20 -0500 )edit

Can you query the parameter with rosparam get /workspace ? Otherwise another way to set the parameter is <rosparam param="workspace"> [0.55, 0.9, -0.4, 0.4, -0.25, 2]</rosparam>. The param tag will default any value that isn't obviously a boolean, int, or double to a string.

aak2166 ( 2015-03-28 19:31:25 -0500 )edit

Thanks, using rosparam made it work.

atp ( 2015-03-28 19:38:04 -0500 )edit

add a comment

Question Tools

1 follower

Stats

Asked: 2015-03-28 16:38:56 -0500

Seen: 7,074 times

Last updated: Mar 28 '15

Arrays Ros Launch File edit

1 Answer

Comments

Question Tools

Stats

Related questions

Arrays Ros Launch File