Robust Control Toolbox™

Reduced order model

Syntax

• [sysr,syse,gain] = dcgainmr(sys,ord)
  

Description

[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)
  

See Also

reduce

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cpmargin

decay

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