please use MATLAB coding to solve the question and please explain each code.

1. (50 points) Write a function named largest that will receive one vector vec as input argument. The elements of vec are of type double, and they can be positive or negative numbers. The function will return the largest element of vec that is adjacent to an element with the value 0(zero). If the input argument vector is empty, or if there is no element with the value zero (hence, no element adjacent to a zero), then the function should ret empty vector You are NOT allowed to use the following built-in Matlab functions: imdilate, unique, diff, find and max. The function should return the desired output regardless of the input vector size. You must use for-loops to parse the vectors. Here are examples of calling the functions >> vec = [1 5 302708910]; >>largest (vec) ans >> largest ([1 2 3 2 4]) ans [l >> largest ([]) ans t1