python slice an array
a[start:stop] # items start through stop-1 a[start:] # items start through the rest of the array a[:stop] # items from the beginning through stop-1 a[:] # a copy of the whole array Example: >>> a = [1, 2, 3, 4, 5, 6, 7, 8] >>> a[1:4] [2, 3, 4]
numpy how to slice individual columns
X = data[:, [1, 9]]
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