SciPy Recipes

Accessing sub arrays using slices

A slice is a reference to a subset of the elements in an array. Slices allow access to subranges of equally spaced items across each axis of the array. For example, the following code accesses a subset of elements on contiguous rows and columns of the array x:

y = x[2:4, 3:6]dumpArray(y)

This will produce the following output:

23 24 2533 34 35

Notice that, as is the case with ranges, the slice does not include its rightmost index. Thus, for instance, the slice 3:6 refers items at positions 3, 4, and 5. 

NumPy follows the standard interface for Python slices, where i:j:k denotes a slice from i to j with step k. See the following link for the full documentation: https://docs.python.org/3/library/stdtypes.html#sequence-types-list-tuple-range. ...