Create a function tridiagonal.m that will construct a tridiagonal matrix of size $nxn,$ where

n is an input passed to the function, and the resulting matrix is the output. Along the

main diagonal, enter values of $2.$ Along the diagonals next to the main diagonal, enter

values of $-1.$

Write a script maketridiagmatrix.m that asks the user to input size $n,$ then calls the

function tridiagonal.m$,$ then displays the resulting matrix.

Example output would be $($for $n=7,$ say$)$: