Indexing

1. Look up the values of the two-dimensional arrays with indexing:

array_1[0,0]   #Finds value in first row and first column.
1

1. View the first row:

array_1[0,:]
array([1, 2])

1. Then view the first column:

array_1[:,0]
array([1, 3, 5, 7, 9])

1. View specific values along both axes. Also view the second to the fourth rows:

array_1[2:5, :]
array([[ 5,  6],
       [ 7,  8],
       [ 9, 10]])

1. View the second to the fourth rows only along the first column:

array_1[2:5,0]
array([5, 7, 9])