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std_msgs::Duration multipliation

asked 2016-09-26 03:32:53 -0600

eed
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Hi I want to calculate a distance. Therfore I have a std_msgs::Duration t and want to calculate:

d*d = t*t * w*w;

with w is the speed of sound (for now as a float). The error I get is:

no match for ‘operator*’ (operand types are ‘const Time {aka const std_msgs::Time_<std::allocator<void> >}’ and ‘const Time {aka const std_msgs::Time_<std::allocator<void> >}’)
 d1_2 = t1*t1*omega*omega;

I think I have to convert the duration into a float. But I don't know how to do.

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answered 2016-09-26 08:04:55 -0600

Dan Lazewatsky
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Take a look at the API reference for DurationBase, which Duration inherits from. You probably want toSec which returns a double.

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That looks good but doesn't work:

error: ‘const Duration’ has no member named ‘toSec’

I used std_msgs::Duration. Now I try to ue ros::Duration, than i think your answer work.

eed ( 2016-09-27 03:23:18 -0600 )edit

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Asked: 2016-09-26 03:32:53 -0600

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Last updated: Sep 26 '16

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