Get array elements from index to end
indexing, numpy, python, vector
Solution
The `[:-1]` removes the last element. Instead of
a[3:-1]
write
a[3:]
You can read up on Python slicing notation here: Understanding slicing
NumPy slicing is an extension of that. The NumPy tutorial has some coverage: Indexing, Slicing and Iterating.
Problem
Suppose we have the following array: ``` import numpy as np a = np.arange(1, 10) a = a.reshape(len(a), 1) array([[1], [2], [3], [4], [5], [6], [7], [8], [9]]) ``` Now, i want to access the elements from index 4 to the end: ``` a[3:-1] array([[4], [5], [6], [7], [8]]) ``` When i do this, the resulting vector is missing the last element, now there are five elements instead of six, why does it happen, and how can i get the last element without appending it? Expected output: ``` array([[4], [5], [6], [7], [8], [9]]) ```