Question about exponential transfer function

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Kim
Kim 2014-1-23
回答： Patrik Ek 2014-1-23
Generally in matlab, exponential transfer function can be used by
i.e., exp(M*s) where M<0
which means 'input delay', or derived from 'second translation(shifting) theorem' But, how can we analysis exponential transfer function in matlab such that
i.e., exp(M*s) where M > 0. ?

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回答（1 个）

Patrik Ek
Patrik Ek 2014-1-23
What do you need this for? In general I would say that you cannot do this. Just look att the definition of the laplace transformation. Which is only defined from 0 to infinity. Matlab notice this too by declaring the transfer function as non causal.
s = tf('s')
h = exp(2*s)
Error using tf/exp (line 34)
In "exp(M*s)", M must have nonpositive entries for causality.

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