MATLAB CONTROL SYSTEM TOOLBOX 9 Especificações Página 564

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tf
16-224
See also filt for direct specification of discrete transfer functions using the
DSP convention.
Note that
tf stores data so that the numerator and denominator lengths are
made equal. Specifically,
tf stores the values
num = [0 1 1]; den = [1 2 3]
for g (the numerator is padded with zeros on the left) and the values
num = [1 1 0]; den = [1 2 3]
for h (the numerator is padded with zeros on the right).
Algorithm tf uses the MATLAB function poly to convert zero-pole-gain models, and the
functions
zero and pole to convert state-space models.
See Also filt Specify discrete transfer functions in DSP format
frd Specify a frequency response data model
get Get properties of LTI models
set Set properties of LTI models
ss Specify state-space models or convert to state space
tfdata Retrieve transfer function data
zpk Specify zero-pole-gain models or convert to ZPK
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