Ggplot manual legend

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I would like to add a legend to this plot, to label each line. However, since I added each line manually, I am not sure how to add the legend.

If you set "code names" for colors, you can define them in a manual scale for that attribute. For example. Anytime you ask a question, it's just polite to include a reproducible example so the answer-er doesn't have to do all the work themselves to test. Learn more. How to add legend to ggplot manually? Asked 6 years, 3 months ago. Active 3 years, 3 months ago. Viewed 85k times. Gregor Thomas Since you can't share your plot, could you make your example reproducible by either a using a built-in data set or b simulating a little illustrative example?

It saves everyone who might try to answer your question from having to do it themselves and gets everyone on the same page. Active Oldest Votes. MrFlick MrFlick k 12 12 gold badges silver badges bronze badges. I agree with the above answer.

ggplot manual legend

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ggplot manual legend

Linked See more linked questions. Related Hot Network Questions. Stack Overflow works best with JavaScript enabled.Legend type guide shows key i. Legend guides for various scales are integrated if possible.

A character string or expression indicating a title of guide. If NULLthe title is not shown. By default waiverthe name of the scale object or the name specified in labs is used for the title.

ggplot manual legend

A character string indicating the position of a title. One of "top" default for a vertical guide"bottom", "left" default for a horizontal guideor "right. A theme object for rendering the title text. By default, the theme is specified by legend. If TRUE then the labels are drawn. A character string indicating the position of a label. One of "top", "bottom" default for horizontal guide"left", or "right" default for vertical guide.

A theme object for rendering the label text. A numeric or a grid::unit object specifying the width of the legend key. Default value is legend. A numeric or a grid::unit object specifying the height of the legend key.

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A character string indicating grid::unit for keywidth and keyheight. If FALSE the default the legend-matrix is filled by columns, otherwise the legend-matrix is filled by rows.

This controls the order in which multiple guides are displayed, not the contents of the guide itself. If 0 defaultthe order is determined by a secret algorithm. As for how to specify the guide for each scale in more detail, see guides. A character string indicating the direction of the guide.

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One of "horizontal" or "vertical.Start by creating a box plot using the ToothGrowth data set. Change the box plot fill color according to the grouping variable dose. The function labs can be used to easily update the legend title for a given aesthetic fill, color, size, shape, linetype, … :. Legend loction can be also a numeric vector c x,ywhere x and y are the coordinates of the legend box. Their values should be between 0 and 1. This makes it possible to place the legend inside the plot.

In this case the argument guide is used as follow. We introduce how to easily change a ggplot legend title, position and labels. The different steps are summarized as follow.

This R graphics tutorial shows how to customize a ggplot legend. In the default setting of ggplot2, the legend is placed on the right of the plot. Reverse legend order. The easy way to reverse the order of legend items is to use the ggplot2 legend guides function.

It change the legend order for the specified aesthetic fill, color, linetype, shape, size, etc. Hide the entire legend to create a ggplot with no legend. Just specify the argument show. Modify the legend background color, key size and key width.

Rename legend labels and change the order of items in a given legend. Control the legend colors manually by specifying custom color values. Set ggplot legend guides for each aesthetic when you have many legends. R function: guides Change the legend order in the situation where you have multiple legends or multiple guides generated by using multiple aesthetics shape, color, size, fill, etc in the plot.

For example, you might have one legend for point shape and another for point color and size. Remove the legend for a specific aesthetic, say the legend for shape. Key ggplot2 R functions Change legend title Change legend position Reverse the order of legend items Remove legend Change the legend font size, color and face Change legend background color, key size and width Rename legend labels and change the order of items Change legend colors manually Multiple guides: Remove and order legends Conclusion.

Key ggplot2 R functions Start by creating a box plot using the ToothGrowth data set.I am trying to figure out how to add a manual legend to a ggplot2 figure. From my reading, you have to add color to aes. However, from all of the examples that I have seen, the color is used for a factor variable.

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I have a line plot with three continuous variables. I need to add a simple legend for the colors. The previous solution is the best way but if you want to use wide dataframes you can do it with. I would suggest the long format as it makes life a lot easier. Thank you andresrcs. I do need to keep values in separate columns so your method seemed best.

Unfortunately getting stuck on an error message. Look a little closer to the example, if you want a legend you have to map the columns to the color aesthetic so you have to do it inside aes.

I just want to point out that you can keep your underlying data in whatever shape is most convenient and just reshape it temporarily for plotting with ggplot. If you're going to be using ggplot regularly, it will work much more effectively if you put your data in "long" format for plotting, regardless of what shape you keep your data in for other purposes. This topic was automatically closed 7 days after the last reply. New replies are no longer allowed.

Change Legend Title in ggplot2 (2 Example Codes) | Modify Text of ggplot Legends

Adding manual legend to ggplot2 tidyverse. Hello, I am trying to figure out how to add a manual legend to a ggplot2 figure. Reordering of legend in ggplot2.This article explains how to change the text of a ggplot2 legend in R. The tutorial is structured as follows:. First, we need to install and load the ggplot2 package in R….

ggplot manual legend

Figure 1: ggplot2 with Default Specification. As you can see based on Figure 1, the default specification of the ggplot2 package shows the column name of our group variable as legend title. This is by the way true for all types of plots e. So keep on reading…. Figure 3: ggplot2 with Legend Title Modified by labs.

As you can see, the second example resulted in the same legend text as the code of example 1 besides calling the legend title No. The ggplot2 environment provides many different possibilities for the formatting of our plots. If you want to learn more about the ggplot2 package, I can recommend the following YouTube video of Roger Peng:. Please accept YouTube cookies to play this video. By accepting you will be accessing content from YouTube, a service provided by an external third party.

YouTube privacy policy. Accept YouTube Content. Besides the video, you might also want to have a look at the other R programming tutorials of this website:. This tutorial showed how to format the text of legends in ggplot2. Your email address will not be published. Post Comment. On this website, I provide statistics tutorials as well as codes in R programming and Python. Create Example Data First, we have to create some data for the examples of this tutorial: set.

YouTube privacy policy If you accept this notice, your choice will be saved and the page will refresh. Leave a Reply Cancel reply Your email address will not be published.In general, if you want to map an aesthetic to a variable and get a legend in ggplot2 you do it inside aes. If you want to set an aesthetic to a constant value, like making all your points purple, you do it outside aes.

However, there are situations where you might want to set an aesthetic for a layer to a constant but you also want a legend for that aesthetic. A few situations where we might want legends without mapping an aesthetic to a variable are: 1.

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Adding a statistic like the mean as a line or symbol and wanting a legend to define it 2. Adding lines based on different fitted models.

I will use a linear, a quadratic, and a cubic model. You can see I set a different color per fitted line. It would be nice to know which line came from which model, and adding a legend is one way to do that. So how can we do this?

But nothing changes. You can change already created mappings but not construct them. In ggplot2mappings are constructed by aes. Aesthetics therefore must be inside aes to get a legend. This adds a legend to the plot. The values are no longer recognized as colors since aes treats these as string constants.

Creating legends when aesthetics are constants in ggplot2

The colors are now correct but the legend still leaves a lot to be desired. The order of the labels must be the same as the order of the breaks. This has nicer labels, but the legend has other problems, similar to those above. For the first two issues I will again use name and breaks to get things named and in the desired order. The vector of colors needs to either be in the same order as the breaks or given as a named vector. You can see what I would consider some of the canonical questions and answers on this topic from Stack Overflow here and here.

Guide to ggplot Colors: Working with Manual Color Scales for Categorical Data

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Ggplot manual legend

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