If Y consists of complicated numbers, MATLAB® plots the imaginary part of Y compared to the real Element of Y. If you specify both of those X and Y, the imaginary portion is ignored. Using MATLAB to Measure the Diameter of an Object in an Image: Working with this project, https://matlab-homework-help10964.angelinsblog.com/29254047/matlab-online-help-things-to-know-before-you-buy