Exercise

Stepping into 2D

Now assume that your research requires you to take an admittedly unrepresentative sample of trunk diameters, which are located in the third column of tree_census. Getting just a selection of trunk diameters can be done with NumPy's slicing and stepping functionality.

numpy is loaded as np, and the tree_census 2D array is available.

Instructions 1/2

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1
- Create an array called hundred_diameters which contains the first 100 trunk diameters in tree_census.

2
- Create an array,every_other_diameter, which contains only trunk diameters for trees with even row indices from 50 to 100, inclusive.