Reduced order model
[sysr,syse,gain] = dcgainmr(sys,ord)
[sysr,syse,gain] = dcgainmr(sys,ord) returns a reduced order model of a continuous-time LTI system SYS by truncating modes with least DC gain.
Specify your LTI continuous-time system in sys. The order is specified in ord.
This function returns:
sysr—The reduced order models (a multidimensional array if sys is an LTI array)
syse—The difference between sys and sysr (syse=sys-sysr)
gain—The g-factors (dc-gains)
The DC gain of a complex mode
(1/(s+p))*c*b'
is defined as
norm(b)*norm(c)/abs(p)