Estimate parameters of ARX or AR model using least squares
sys = arx(data,[na
nb nk])
sys = arx(data,[na
nb nk],Name,Value)
sys = arx(data,[na
nb nk],___,opt)
Note:

returns an ARX structure polynomial
model, sys
= arx(data
,[na
nb nk]
)sys
, with estimated parameters and covariances
(parameter uncertainties) using the leastsquares method and specified orders
.
estimates
a polynomial model with additional options specified by one or more sys
= arx(data
,[na
nb nk]
,Name,Value
)Name,Value
pair
arguments.
specifies
estimation options that configure the estimation objective, initial
conditions and handle input/output data offsets.sys
= arx(data
,[na
nb nk]
,___,opt
)

Estimation data. Specify 

Polynomial orders.


Estimation options.
Use 
Specify optional commaseparated pairs of Name,Value
arguments.
Name
is the argument
name and Value
is the corresponding
value. Name
must appear
inside single quotes (' '
).
You can specify several name and value pair
arguments in any order as Name1,Value1,...,NameN,ValueN
.

Input delays. For a system with Default: 0 for all input channels 

Transport delays. Specify transport delays as integers denoting delay of a multiple
of the sample time For a MIMO system with Default: 0 for all input/output pairs 

Specify integrators in the noise channels. Adding an integrator creates an ARIX model represented by: $$A(q)y(t)=B(q)u(tnk)+\frac{1}{1{q}^{1}}e(t)$$ where,$$\frac{1}{1{q}^{1}}$$ is the integrator in the noise channel, e(t).
Default: 

Identified ARX structure polynomial model.
