Adding customized legends for multiple-line graphs
Line graphs with more than one line, representing more than one variable, are quite common in any kind of data analysis. In this recipe, we will learn how to create and customize legends for such graphs.
Getting ready
We will use the base graphics library for this recipe, so all you need to do is run the recipe at the R prompt. It is good practice to save your code as a script for use again later.
How to do it...
Once again we will use the cityrain.csv example dataset that we used in Chapter 1, R Graphics, and Chapter 3, Beyond the Basics – Adjusting Key Parameters:
rain<-read.csv("cityrain.csv") plot(rain$Tokyo,type="b",lwd=2, xaxt="n",ylim=c(0,300),col="black", xlab="Month",ylab="Rainfall (mm)", ...Get R: Data Analysis and Visualization now with the O’Reilly learning platform.
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