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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.
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.
16 Μαΐ 2021 · Legends are useful to add more information to the plots and enhance the user readability. It involves the creation of titles, indexes, placement of plot boxes in order to create a better understanding of the graphs plotted. The in-built R function legend() can be used to add legend to plot.
Add and customize the legends in ggplot2. Learn how to change the title, the labels, the keys, how to modify the background color, change its position or get rid of it
To add legends to plots in R, the R legend () function can be used. A simplified format of the function is : legend(x, y=NULL, legend, fill, col, bg) x and y : the x and y co-ordinates to be used to position the legend. legend : the text of the legend.
The legend can be a guide for fill, colour, linetype, shape, or other aesthetics. With fill and color. Because group, the variable in the legend, is mapped to the color fill, it is necessary to use scale_fill_xxx, where xxx is a method of mapping each factor level of group to different colors.
In this chapter, we will learn how to: position the legend within the plot. modify the layout using ncol and horiz arguments. add title using the title set of arguments. modify the appearance and position of the legend box. modify the appearance of the text in the legend box.
