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A legend of a plot helps to understand which series or groups corresponds to each bar, line, box or observations, based on its type, color or both. In this tutorial you will learn how to add a legend to a plot in base R and how to customize it.
If you want to add a legend to a ggplot2 chart you will need to pass a categorical (or numerical) variable to color, fill, shape or alpha inside aes. Depending on which argument you use to pass the data and your specific case the output will be different.
Legends (ggplot2) Problem. You want to modify the legend of a graph made with ggplot2. Solution. Start with an example graph with the default options: library(ggplot2) bp <- ggplot(data=PlantGrowth, aes(x=group, y=weight, fill=group)) + geom_boxplot() bp. Removing the legend. Use guides(fill=FALSE), replacing fill with the desired aesthetic.
This post explains how to add a legend to a chart made with base R, using the legend () function. It provides several reproducible examples with explanation and R code.
Example 1: Adding Simple Legend to Plot. Example 1 explains how to add a legend to our plot using the legend() function in R. For this, we first have to draw our plot (as we already did before) and then we have to apply the legend function as shown below:
This function can be used to add legends to plots. Note that a call to the function locator (1) can be used in place of the x and y arguments.
This post describes all the available options to customize the chart legend with R and ggplot2. It shows how to control the title, text, location, symbols and more.
