armac

Scilab description of an armax process

Calling Sequence

[ar]=armac(a,b,d,ny,nu,sig)

Arguments

:a=[Id,a1,..,a_r] is a matrix of size (ny,r*ny) : :b=[b0,.....,b_s] is a matrix of size (ny,(s+1)*nu) : :d=[Id,d1,..,d_p] is a matrix of size (ny,p*ny); : :ny dimension of the output y : :nu dimension of the output u : :sig a matrix of size (ny,ny) :

Description

This function creates a description as a tlist of an ARMAX process

ar is defined by

ar=`tlist`_(['ar','a','b','d','ny','nu','sig'],a,b,d,ny,nu,sig);

and thus the coefficients of ar can be retrieved by e.g. ar(‘a’).

Examples

a=[1,-2.851,2.717,-0.865].*.`eye`_(2,2)
b=[0,1,1,1].*.[1;1];
d=[1,0.7,0.2].*.`eye`_(2,2);
sig=`eye`_(2,2);
ar=armac(a,b,d,2,1,sig)
// extract polynomial matrices from ar representation
[A,B,D]=`arma2p`_(ar);

See Also

  • arma Scilab arma library
  • armax armax identification
  • armax1 armax identification
  • arsimul armax simulation
  • arma2p extract polynomial matrices from ar representation
  • tlist Scilab object and typed list definition.

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