sett (System Identification Toolbox)

Set the sampling interval directly.

modn = sett(mod,T)

Description

All functions that create model descriptions in the theta or freqfunc format set the sampling interval T in their last argument. For convenience sett offers an alternative to set it directly. It can be applied both to the case where mod is a model in the theta format and to the case where mod is a frequency function or spectrum in the freqfunc format, with a default choice of frequencies.

th = armax(z,nn);
th = sett(th,T);

is equivalent to

th = armax(z,nn,[],[],[],[],T)

Similarly,

g = spa(z);
g = sett(g,T);

is equivalent to

g = spa(z,[],[],[],T)

Note that you cannot use sett to recalculate models to a new sampling interval. Use thc2thd or thd2thc instead.