Matlab has built$-$in commands to create a matrix of all ones $($the command is called ones$())$ or all zeros $($with the

zeros$()$ command$).$ Look up the syntax of these commands and then use them along with array addressing to

create an $nn$ matrix whose entries are all $2\text{'}$s around the perimeter of the matrix and otherwise $1$ in locations

where the row and column are even, $-1$ in locations where row and column are odd, and $0$ elsewhere. You may

assume that $n$ is odd. Here is an example of what your matrix would look like for $n=9$ :

Your code should only be a few lines long, not use any loops, and begin with a line that assigns an odd value to $n,$

such as: