Convert a model from continuous time to discrete time.
Syntax
thd = thc2thd(thc,T)
Description
thc is a continuous-time model in the theta format. thd is what is obtained when it is sampled with sampling interval T. If thc is of input-output type, the covariance matrix of the parameters is not translated.
Note that the innovations variance 
of the continuous-time model is interpreted as the intensity of the spectral density of the noise spectrum. The innovations variance in thd will thus be given as 
/T.
Examples
Define a continuous-time system and study the poles and zeros of the sampled counterpart:
thc = poly2th(1,1,1,1,[1 1 0],1,-1);
thd = thc2thd(thc,0.5);
zpplot(th2zp(thd))
See Also
thd2thc
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