MIMO PID tuning by LMIs

Matlab implementation of the automatic MIMO PID tuning reported in:

S. Boyd, M. Hast, and J. Astrom, "MIMO PID tuning via iterated LMI restiction", Inter. J. of Robust & Nonlinear Control, 2016. avilable from: https://web.stanford.edu/~boyd/papers/pdf/mimo_pid_tuning.pdf

Note that this code was not written by the authors of the paper, and it is provided here without any guarantee that it actually works.