[fzk2007]

syms s;%定义符号变量s
ezplot(ilaplace(1/s/(0.5*s+1)),[0,5])

多多用用help
help ezplot
EZPLOT Easy to use function plotter.
EZPLOT(f) plots the expression f = f(x) over the default
domain -2*pi < x < 2*pi.

EZPLOT(f, [a,b]) plots f = f(x) over a < x < b