Key Ideas

  • Creating np arrays
  • Slicing and reshaping arrays
  • Operations on arrays such as broadcasting

In-Class Activity

  • Download broadcast.py and study it until you understand it fully. The program illustrates the concept of broadcasting.

Active Learning

Work through np_tutorial2.py and then do the following:

  1. Create a vector Z with values ranging from 10 to 49.
  2. Reverse Z.
  3. Create a 3x3 matrix M with values ranging from 0 to 8.
  4. Create a 3x3x3 array R with random values.
  5. Create a 3x3 identity matrix.
  6. Can you figure out what the following code produces without running it first? 
    Z = np.zeros((5,5))
Z += np.arange(5)
print(Z)