... returns the square of x. z = x.ˆ2; Typing sq(3) produces the answer 9, whether or not x or z is already defined in your Workspace, and neither defines them, nor changes their definitions, if they have ... combine them element-wise. Specifically, if A and B are the same size, then A.*B is the element-by-element product of A and B, that is, the matrix whose i, j element is the product of the i, j ... displayed when you type help sq. The remaining lines constitute the function body; they contain the MATLAB statements that calculate the function values. In addition, there can be com- ment lines...