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Inconsistent plot vs numerical data display in rqt_bag

rqt
melodic

asked 2020-03-07 19:00:23 -0500

pauljurczak
85 ●7 ●10 ●12

updated 2020-03-10 23:56:10 -0500

I'm running ROS Melodic on Ubuntu 18.04. When I visualize a rosbag with rqt, plotted data (z = 1.00) does not correspond to numerical values displayed in the right pane (z = 0.00). Here is the screenshot:

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Please attach your screenshot directly to the question. I've given you sufficient karma.

gvdhoorn ( 2020-03-08 06:31:22 -0500 )edit

@gvdhoorn Sorry for the delay, I didn't see your comment. BTW, when I leave Firefox tab with my question open, Asked: 46 hours ago updates automagically, but Comments, Seen: 7 times and other elements require manual page refresh.

pauljurczak ( 2020-03-09 17:46:50 -0500 )edit

when I leave Firefox tab with my question open, Asked: 46 hours ago updates automagically,

yes, it's a javascript based timer running client side.

but Comments, Seen: 7 times and other elements require manual page refresh.

AskBot does not use any event pushing, so a reload is necessary to refresh the page.

gvdhoorn ( 2020-03-10 03:06:16 -0500 )edit

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answered 2020-03-10 11:45:32 -0500

Stefan Kohlbrecher

flag of Germany

24361 ●173 ●299 ●444 https://www.energy-rob...

I noticed some years ago that the rqt_bag plot functionality apparently doesn't plot all datapoints, but appears to only sample them. This clearly limits the plot's usefulness. Should be find- and fixable when looking at source, but there are also alternatives such as PlotJuggler available that don't show this issue.

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PlotJuggler does indeed show complete data in my case.

pauljurczak ( 2020-03-11 00:17:18 -0500 )edit

Furthermore, in your case, PlotJuggler will show the yaw rotation in degrees instead of the raw quaternion ;)

Davide Faconti ( 2020-05-04 09:47:59 -0500 )edit

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Asked: 2020-03-07 19:00:23 -0500

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Last updated: Mar 10 '20

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