====== Control ======

===== SciLab / XCOS =====

  * https://www.youtube.com/watch?v=5VlYFJCdTBY
  * https://scilab.io/introduction-to-control-systems-in-scilab-tutorial/
  * https://scilab.io/products/scilab/control-systems/
  * https://www.youtube.com/watch?time_continue=61&v=Lqa2lnxoIsU
  * https://www.youtube.com/watch?v=HZ88d_n7Q5M

===== Octave =====

  * https://wiki.octave.org/Control_package
  * https://pdfs.semanticscholar.org/1c8c/c12a29c4051048e63f30c53e0ad6c9ebedc3.pdf
  * http://www.obihiro.ac.jp/~suzukim/masuda/octave/html3/octave_155.html