Comments on “Upper and Lower Bounds for Controllable Subspaces of Networks of Diffusively Coupled Agents”
Mengran Xue, Sandip Roy · IEEE Transactions on Automatic Control · 2017
A condition for controllability of a network of diffusively coupled linear agents with sparse actuation, which was developed in[1], is examined. An example is presented which demonstrates that the condition is not always sufficient for controllability. The gap in the original proof is clarified, and issues related to developing a necessary and sufficient condition are briefly discussed.