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R Graphs Cookbook by Hrishi Mittal

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Creating heat maps of single Z variable with scale

In this recipe we will learn how to make a heat map showing the variation in values of one variable (z) along the X and Y axes as a grid of colors, and display a scale alongside.

Getting ready

We are only using the base graphics functions for this recipe. So, just open up the R prompt and type the following code. We will use the sales.csv example dataset for this recipe. So let's first load it:

sales<-read.csv("sales.csv")

We will use the RColorBrewer package for some good color palettes. So let's make sure it's installed and loaded:

install.packages("RColorBrewer")
library(RColorBrewer)

How to do it...

The sales dataset has monthly sales data for four cities. Let's make a heat map with the months along ...

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