please use Matlab

function, set all elements above diagonal to zero Write a function named myFunction(m) which accepts an arbitrarily input square matrix m and return a matrix half same as m, but with all elements above diagonal zeros (including the diagonal) For example, input m=(1 2 3;4 5 6;7 8 9) should return 0 4 0 7. 8 Hint: need to figure out dimensions of the input matrix Assessment: keywords: myFunction, for return value