Unit Step and Discrete Delta function Data Sequence

Hello,

I am curious about solving the following problem. Using an index vector from -3 to 14, I must create a data sequence consisting of the following: x[n] = u[n] * s[n] + 1.4 * d[n-3]

u[n] being the unit step function

s[n] being the sampled sine wave

d[n] being the discrete delta function

What I have so far is my sampled sinewave described in the following code:

Ts = 1.6e-3;% sample time
Fs = 1600; % sample rate
t = linspace(-3, 14, Fs); % time
uu = 1*(t >= 1);% unit step
w = 2*pi*187; % omega
xx = 0.187*sin(w*t);% x(t) = 0.187sin(w*t)
xxuu = xx .* uu; % multiplying step function with sine wavestem(t, xxuu)% stem plot

If possible, I would appreciate any comments made on the code as they would help me understand what exactly is going on. Any help is deeply appreciated.