NumPy Tutorial · NumPy ufunc

ufunc Differences

Learn all about ufunc Differences in this comprehensive tutorial.

5 min read advanced

Differences

A discrete difference means subtracting two successive elements.

E.g. for [1, 2, 3, 4], the discrete difference would be [2-1, 3-2, 4-3] = [1, 1, 1]

To find the discrete difference, use the diff() function.

python

import numpy as nparr = np.array([10, 
  15, 25, 5])newarr = np.diff(arr)print(newarr)

Note: Returns: [5 10 -20] because 15-10=5, 25-15=10, and 5-25=-20

We can perform this operation repeatedly by giving parameter n.

python

import numpy as nparr = np.array([10, 
  15, 25, 5])newarr = np.diff(arr, n=2)print(newarr)

Note: Returns: [5 -30] because: 15-10=5, 25-15=10, and 5-25=-20 AND 10-5=5 and -20-10=-30

2 questions

Which of the following is true about ufunc Differences?

It is strictly typedIt is evaluated at runtimeIt requires explicit memory managementIt is deprecated

What is the most common pitfall when working with ufunc Differences?

SyntaxErrorIndentationErrorNameErrorTypeError

Answer all questions to submit.