Exercise

Subsetting 2D arrays

Subsetting 2D arrays is similar to subsetting nested lists. In a 2D array, the indexing or slicing must be specific to the dimension of the array: 

array[row_index, column_index]

numpy is imported as np and the 2D array stock_array_transposed (from the previous exercise) is available in your workspace.

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Extract the first column from stock_array_transposed and assign it to prices.