Assignment 5 Feedback¶

Closed at 2pm Monday 13th; I can't accept late submissions unfortunately.

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Send me additional emails if I don't respond; like a giant stack of pancakes I'm often dealing with the latest one.

Good news, there is a link to click at the top of the Assignment 6 notebook.¶

This is a 100% scoring example.

What is wrong here?

This is a 100% scoring example.

What is wrong here?

Array Indexing¶

Say our numpy array looks like this:

A B C

How can we apply a function to all of the rows or columns?

Array Indexing¶

    # Create array of zeros
    x = np.ones((3,4))
    # [[1. 1. 1. 1.]
       [1. 1. 1. 1.]
       [1. 1. 1. 1.]]

    # sum over rows
    y = np.sum(x, axis=0)
    # [3. 3. 3. 3.]

    # sum over columns
    z = np.sum(x, axis=1)
    # [4. 4. 4]

Broadcasting¶

        # Create array of zeros
        x = np.ones((3,4))
        # [[1. 1. 1. 1.]
           [1. 1. 1. 1.]
           [1. 1. 1. 1.]]
    
        y = x + 5

What is going to happen to this array?

Broadcasting¶

      # y
      # [[6., 6., 6., 6.],
         [6., 6., 6., 6.],
         [6., 6., 6., 6.]]

Broadcasting¶

    # Create array of zeros
    x = np.ones((3,4))
    # [[1. 1. 1. 1.]
       [1. 1. 1. 1.]
       [1. 1. 1. 1.]]

    y = (x + 2) * (x + 2)

What is going to happen to this array?

Broadcasting¶

  # y
  # [[9. 9. 9. 9.]
     [9. 9. 9. 9.]
     [9. 9. 9. 9.]]