define constants inside a laplace function

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Ivonne R
Ivonne R 2015-9-22
回答： Walter Roberson 2015-9-23
I'd like to get the Laplace of a window function. I'd get the right output if I write this:
b=1;a=2;
syms t s
laplace((heaviside(t-a)-heaviside(t-b)))
ans =
exp(-2*s)/s - exp(-s)/s
but I'd like to preserve a and b as constants. However when I defined as " syms t s a b " it doesn't give the Laplace Transform because there's too many variables. Thanks!

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回答（1 个）

Walter Roberson
Walter Roberson 2015-9-23
laplace((heaviside(t-a)-heaviside(t-b)), t, s)

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