| System Identification Toolbox | |
To allow direct calls to typical LTI commands from idmodel objects. The Control System Toolbox is required for these commands.
Syntax
append, augstate, balreal, canon, d2d, feedback, inv, minreal,
modred, norm, parallel, series, ss2ss
Description
If you have the Control System Toolbox, most of the relevant LTI-commands, as listed under Syntax, can be directly applied to any idmodel (idarx, idgrey, idpoly, idss). You can also use the overloaded operations +, -, and *. The same operations are performed and the result is delivered as an idmodel. The original covariance information is however lost, most of the time.
Example
You have two more or less identical processes connected in series. Estimate a model for one of them, and use that to form an initial estimate for a model of the connected process.
m = pem(data) % data concerns one of the processes m2 = pem(data2,m*m) % data2 are from the whole connected process
| | iv4 | merge (iddata) | |