mphreduction

Return reduced-order state-space matrices for a model.

data = mphreduction(model, romtag, ...) extracts the reduced order state-space matrices from the reduced order model romtag. The reduced order model can either be created in the COMSOL GUI or via the API.

The function mphreduction accepts the following property/value pairs:

Table 6-28: property/value pairs for the mphreduction command
property	value	default	description
out	Cell array of strings	'all'	Names of output matrices
return	struct \| ss	struct	Return type

The following values are valid for the out property:

Table 6-29: Property/Value Pairs for the property out.
Property	expression	description
out	Kr	Stiffness matrix
	Dr	Damping matrix
	Dra	Damping ratio matrix
	Er	Mass matrix
	Br	Input matrix
	Cr	Output matrix
	F	Input feedback matrix
	B0r	Initial value input matrix
	B0rdot	Initial value time derivative input matrix
	Brdot	Time derivative input matrix
	Brdotdot	Second time derivative input matrix
	Mc	Damping matrix
	MA \| A	Stiffness matrix
	MB \| B	Input matrix
	D	Input feedback matrix
	C	Output matrix
	L	Load vector
	Y0	Output bias
	U0	Initial value vector
	Udot0	Initial derivative vector
	Kud	Stiffness matrix times ud

The return type ss requires that the Control System Toolbox is installed.