You should hand in printouts of your MATLAB functions and the testing process. You can either write a script to test your functions or do your testing at the command line.

- 1)
- (2 pts) Write your own MATLAB function to compute the area of a circle
given the diameter. As a starting point, the first line in your function should
look like
function [area] = circle_area(d)

Test your program using*d*= 1.4. - 2)
- (5 pts) Write a function that will take the
*x*and*y*-coordinates of a point in the*x*-*y*plane as input and return the coordinates of the point in polar coordinates. This function will have two inputs (*x*and*y*) and two outputs (a radius and an angle in radians).Test your function using the points (1,1), (-1,1) and (-3,-4). Be sure to check your answers.

- 3)
- (3 pts) Write a function that will compute the Pearson correlation coefficient
given two vectors of
*x*and*y*coordinates (note that 90% of this problem is already done for you). Test your function on the data in the`testdata.dat`file from the last class.

2018-09-17