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Get mean of two ros::Time stamps

ros_time

asked 2015-03-20 11:38:17 -0500

luator
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Given two ros::Time instances t1 and t2. What is the easiest, clearest way to compute the mean them, that is the time that is in the middle between t1 and t2?

The obvious solution (t1 + t2) / 2 does unfortunately not work, as + is undefined for two ros::Time instances.

My second idea, t1 + (t2 - t1) / 2 does still not work. The subtraction and addition work, but it will fail on the division.

Of course, I could just convert the time stamps to seconds to do the calculation, but I wonder if there is a nicer way, using ros::Time.

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answered 2015-03-20 19:03:11 -0500

Stefan Kohlbrecher

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

This appears to work:

ros::Time start;
ros::Time end;

ros::Time mid = start + (end - start) *0.5;

You can only add a Duration to a time (and subtracting one Time from another gives a Duration).

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Strange, that multiplication is implemented but division is not... Thanks a lot.

luator ( 2015-03-27 04:11:41 -0500 )edit

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Asked: 2015-03-20 11:38:17 -0500

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