Book Image

R for Data Science Cookbook (n)

By : Yu-Wei, Chiu (David Chiu)
Book Image

R for Data Science Cookbook (n)

By: Yu-Wei, Chiu (David Chiu)

Overview of this book

This cookbook offers a range of data analysis samples in simple and straightforward R code, providing step-by-step resources and time-saving methods to help you solve data problems efficiently. The first section deals with how to create R functions to avoid the unnecessary duplication of code. You will learn how to prepare, process, and perform sophisticated ETL for heterogeneous data sources with R packages. An example of data manipulation is provided, illustrating how to use the “dplyr” and “data.table” packages to efficiently process larger data structures. We also focus on “ggplot2” and show you how to create advanced figures for data exploration. In addition, you will learn how to build an interactive report using the “ggvis” package. Later chapters offer insight into time series analysis on financial data, while there is detailed information on the hot topic of machine learning, including data classification, regression, clustering, association rule mining, and dimension reduction. By the end of this book, you will understand how to resolve issues and will be able to comfortably offer solutions to problems encountered while performing data analysis.
Table of Contents (19 chapters)
R for Data Science Cookbook
About the Author
About the Reviewer

Adjusting scales

Besides setting aesthetic mapping for each plot or geometric object, one can use scale to control how variables are mapped to the visual property. In this recipe, we introduce how to adjust the scale of aesthetics in ggplot2.

Getting ready

Ensure you have completed the previous steps by storing sample_mean in your R environment.

How to do it…

Perform the following steps to adjust the scale of aesthetic magnitude in ggplot2:

  1. First, make a scatterplot by setting size=Total_Sales, colour=Province, y=Province, and conditional on Year_Month. Resize the point with the scale_size_continuous function:

    > g <- ggplot(data=sample_sum, mapping=aes(x=Year_Month, y=Province, size=Total_Sales, colour = Province ))
    > g + geom_point(aes(size=Total_Sales)) + scale_size_continuous(range=c(1,10)) + ggtitle('Resize The Point')
  2. Repaint the point in gradient color with the scale_color_gradient function:

    > g + geom_point(aes(colour=Total_Sales)) + scale_color_gradient()+ ggtitle('Repaint...