how to graph this system of questions into mathlab

Here is my question to solve: Graph the following system on the same set of axes

f(𝑣) = { −0.001778 ∙ 𝑣^2 + 0.05333 ∙ 𝑣 𝑖𝑓 0 ≤ 𝑣 < 30

{ 0 𝑖𝑓 𝑣 ≥ 30

Plots the efficiency for speed ranging from 0-35

Answer 1

[Alan Stevens]

You can define the function as follows

f = @(v) (-0.001778*v.^2+0.05333*v).*(v<30);

The (v<30) part simply multiplies the rest by 1 if v is less than 30, and by 0 if v is greater than or equal to 30.

Then construct a vector of values of v running from 0 to 35; call th function with these values to create a vector y, then plot y against v.