Your code works after I fix two typos:
dt=0.01;
h=0.1;
w=0.1;
to=2.5;
t=0:dt:10;
r=h*exp(-((t-to).^2)/w^2);
plot(t,r,'b','linewidth',2);
xlabel('t')
ylabel('r(t)')
grid on
You had
plot=()
and
ylable()
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