How can I represent this equation on MATLAB

How can I represent this equation on MATLAB

𝑥(𝑡) = 7 𝑐𝑜𝑠 (3𝜋𝑡) 𝑤ℎ𝑒𝑟𝑒 0≤𝑡≤4

Answer 1

[KSSV]

Extend the example to your case.

n = 100 ; 
t = linspace(0,4,n) ; 
x = 2*sin(3*pi*t) ;
plot(t,x)