Specifications

Table Of Contents

isct, isdt

16-105

16isct, isdt

Purpose Determine whether an LTI model is continuous or discrete

Syntax boo = isct(sys)

boo = isdt(sys)

Description boo = isct(sys) returns 1 (true) if the LTI model sys is continuous and 0

(false) otherwise. sys is continuous if its sample time is zero, that is, sys.Ts=0.

boo = isdt(sys) returns 1 (true) if sys is discrete and 0 (false) otherwise.

Discrete-timeLTImodelshavea nonzerosampletime,exceptforemptymodels

and static gains,which are regarded as either continuous or discrete as long as

their sample time is not explicitly set to a nonzero value. Thus both

isct(tf(10))

isdt(tf(10))

are true. However, if you explicitly label a gain as discrete, for example, by

typing

g = tf(10,'ts',0.01)

isct(g)

now returns false and only isdt(g) is true.