numpy

What it is good for?

numpy makes it easy to work with matrices in Python.

Because it is implemented in C, numpy accelerates many calculations. It is also type-safe - all elements of a matrix have the same type. Many of the most powerful Python libraries like pandas, scikit-learn and PILLOW have been built on top of numpy.

Pre-installed on Anaconda?

yes

How to install it?

  1. pip install numpy

Example

Creating a 4 x 2 matrix and adding 10 to each element

  1. import numpy as np
  3. vector = np.array([[0, 1, 2, 3], [4, 5, 6, 7]])
  4. print(vector + 10)
  6. [[10 11 12 13]
  7.  [14 15 16 17]]
  9. print(vector.shape)
  11. (2, 4)

Where to learn more?

http://www.numpy.org/