Is there a step function?

[XcasEngGuy]

In my class we have been doing Laplace transforms of arbitrary piecewise functions. For example:

f(t)=t-(t-2)*u(t-2)-u(t-4)

where u is a unit step function.

The Laplace transform of (t-1)*u(t-1) should be 1/s^2*exp(-2*s)

My question is, is there a u(t) step function in xcas that can be used in the laplace() function. Am I being clear in this? I know the ilaplace(1) is Dirac(). So, Dirac() is an impulse function?

Matt

[parisse]

Heaviside is the step function. You can also look at piecewise or when.