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As far as I am aware this wont be possible. The $(arg name) leads to substitution with the corresponding argument. But I think this only works for simple operations like replacements or logical decision lie if, unless. http://wiki.ros.org/roslaunch/XML

As far as I am aware this wont be possible. The $(arg name) leads to substitution with the corresponding argument. But I think this only works for simple operations like replacements or logical decision lie if, unless. http://wiki.ros.org/roslaunch/XML

UPDATE This changed in kinetic (see http://answers.ros.org/question/194368/perform-calculation-in-launch-file/?answer=251070#post-id-251070)

UPDATE This changed in kinetic (see http://answers.ros.org/question/194368/perform-calculation-in-launch-file/?answer=251070#post-id-251070)

As far as I am aware this wont be possible. The $(arg name) leads to substitution with the corresponding argument. But I think this only works for simple operations like replacements or logical decision lie if, unless. http://wiki.ros.org/roslaunch/XML http://wiki.ros.org/roslaunch/XML

UPDATE This changed in kinetic (see http://answers.ros.org/question/194368/perform-calculation-in-launch-file/?answer=251070#post-id-251070)