Exercise

How many clusters?

You are given an array points of size 300x2, where each row gives the (x, y) co-ordinates of a point on a map. Make a scatter plot of these points, and use the scatter plot to guess how many clusters there are.

matplotlib.pyplot has already been imported as plt. In the IPython Shell:

  • Create an array called xs that contains the values of points[:,0] - that is, column 0 of points.
  • Create an array called ys that contains the values of points[:,1] - that is, column 1 of points.
  • Make a scatter plot by passing xs and ys to the plt.scatter() function.
  • Call the plt.show() function to show your plot.

How many clusters do you see?

Instructions

50 XP

Possible answers