4.Creating Functions (2 points) Matlab has some built-in functions that we have already used, such as sin(x), plot, etc. Type help function and read the documentation and examples on how to create functions in Matlab. Create a function called custom matrix.m that take two parameters, the matrix number of rows (i) and columns (j). The output of your function should be a matrix called SM. The elements of SM(m, n) where m-= n should be (m*n). The elements of SM(m,n) where m > n should be (m). The elements of SM(m,n) where n > m should be n. An example of your function output when i-4 and j- 4 is provided below. 1 2 3 4 2 4 3 4 3 3 9 4 4 4 4 16