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Python Data Analysis - Third Edition

You're reading from  Python Data Analysis - Third Edition

Product type Book
Published in Feb 2021
Publisher Packt
ISBN-13 9781789955248
Pages 478 pages
Edition 3rd Edition
Languages
Authors (2):
Avinash Navlani Avinash Navlani
Profile icon Avinash Navlani
Ivan Idris Ivan Idris
Profile icon Ivan Idris
View More author details
Toc

Table of Contents (20) Chapters close

Preface 1. Section 1: Foundation for Data Analysis
2. Getting Started with Python Libraries 3. NumPy and pandas 4. Statistics 5. Linear Algebra 6. Section 2: Exploratory Data Analysis and Data Cleaning
7. Data Visualization 8. Retrieving, Processing, and Storing Data 9. Cleaning Messy Data 10. Signal Processing and Time Series 11. Section 3: Deep Dive into Machine Learning
12. Supervised Learning - Regression Analysis 13. Supervised Learning - Classification Techniques 14. Unsupervised Learning - PCA and Clustering 15. Section 4: NLP, Image Analytics, and Parallel Computing
16. Analyzing Textual Data 17. Analyzing Image Data 18. Parallel Computing Using Dask 19. Other Books You May Enjoy

Fitting to polynomials with NumPy

Polynomials are mathematical expressions with non-negative strategies. Examples of polynomial functions are linear, quadratic, cubic, and quartic functions. NumPy offers the polyfit() function to generate polynomials using least squares. This function takes x-coordinate, y-coordinate, and degree as parameters, and returns a list of polynomial coefficients.

NumPy also offers polyval() to evaluate the polynomial at given values. This function takes coefficients of polynomials and arrays of points and returns resultant values of polynomials. Another function is linspace(), which generates a sequence of equally separated values. It takes the start, stop, and the number of values between the start-stop range and returns equally separated values in the closed interval.

Let's see an example to generate and evaluate polynomials using NumPy, as follows:

# Import required libraries NumPy, polynomial and matplotlib
import numpy as np
import matplotlib.pyplot...
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