hinfstruct lets you use the frequency-domain
methods of H∞ synthesis
to tune control systems that have predefined architectures and controller
hinfstruct, you describe your control
system as a Generalized LTI model (Control System Toolbox) that
keeps track of the tunable components of your system.
those parameters by minimizing the closed-loop gain from the system
inputs to the system outputs (the H∞ norm).