Hello,

I'm trying to check my work, but having problems with plotting in Mathematica... Until now i just used Heaviside[ ] function and did ok... but I can't get to plot Dirac... i tried to do it and just can't... please someone help :D

I'm trying to plot these signals....

$\displaystyle h(t) = \delta u (t+2) + 2\delta u(t+1) $

and

$\displaystyle h(t) = \delta u(t-1) -\delta (t-3) $