Hi @RuReady!Normally, guides (a catch-all term for legends, colour bars and other visual demonstrations of scale on the plot) combine automatically, and you can nudge things along by explicitly giving their associated scales the same name.. The diamonds data that ships with ggplot.. Figure 4: ggplot2 of Example Data with Second Legend. Data. In the default setting of ggplot2, the legend is placed on the right of the plot. This R graphics tutorial shows how to customize a ggplot legend. The Default Legend. Here, you can learn how to modify colors of a ggplot2 plot manually.

Legends are a key component of data visualization. This chapter is a natural extension of the last and discusses the role scales play in controlling the guide (the axis or legend associated with the scale). At this point, you have learned basically all things you need to know in order to remove legends in R ggplots. Guides allow you to read observations from the plot and map them back to their original values.

I'm not that sophisticated, but here's one approach that should give you the desired results. The following example presents the default legend to be cusotmized.


Any tips/advice?

I would like to add a legend to this plot, to label each line. A bit of googling turned up this post which doesn't seem to indicate that ggplot currently supports this option. I cannot share the data I am using, so I am just looking for a general way to add legends manually. ggplot format controls are defined below. 13 Guides: legends and axes. Of cause, this kind of code could also be applied to other aesthetics as well as to other kinds of plots (histogram, barchart, QQplot etc.). Figure 2: ggplot2 Plot with Legend. Others have addressed related problems by using gridExtra and using viewPorts as discussed here.. In Chapter 12 I discussed the way a scale maps a variable to an aesthetic. I have a rather complicated plot that shows three different variables in my data - see the example plot below. We’ll show examples of how to move the legend to the bottom or to the top side of the plot. I want to merge two legends in ggplot2.

you will learn how to: Change the legend title and text labels; Modify the legend position.

I use the following code: ggplot(dat_ribbon, aes(x = x)) + geom_ribbon(aes(ymin = ymin, ymax = ymax, group = group, fill = "test4 test5"), As you can see based on Figure 2, we just added a legend to our plot, by moving the col argument within the aes function in the first line of the code. However, since I added each line manually, I am not sure how to add the legend. Note that the colors are different compared to Figure 1, since the aes function is using the default colors of the ggplot2 package.