Change legend text ggplot2

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Change legend text ggplot2

You can also remove all the legends in a graph, using theme. There are two ways of changing the legend title and labels.

change legend text ggplot2

The first way is to tell the scale to use have a different title and labels. The second way is to change data frame so that the factor has the desired form. The legend can be a guide for fillcolourlinetypeshapeor other aesthetics. The default is to use a different hue on the color wheel for each factor level, but it is also possible to manually specify the colors for each level.

See Axes ggplot2 for information on how to modify the axis labels. If you use both colour and shapethey both need to be given scale specifications. Otherwise there will be two two separate legends. There are many kinds of scales. Here are some commonly-used values of xxx and yyy :. The other method, with scales, is generally a better way to do this.

Also note the use of backticks instead of quotes. They are necessary because of the spaces in the variable name.

Change Font Size of ggplot2 Plot in R (5 Examples) | Axis Text, Main Title & Legend

It is also possible to position the legend inside the plotting area. Note that the numeric position below is relative to the entire area, including titles and labels, not just the plotting area. There is not a built-in way to remove the slashes, but it is possible to cover them up. Problem Solution Removing the legend Changing the order of items in the legend Reversing the order of items in the legend Hiding the legend title Modifying the text of legend titles and labels Using scales With fill and color Kinds of scales Changing the factor in the data frame Modifying the appearance of the legend title and labels Modifying the legend box Changing the position of the legend Hiding slashes in the legend Notes Problem You want to modify the legend of a graph made with ggplot2.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. 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.

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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.

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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. 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. Contents Arguments Details See also Examples.

A character string indicating the direction of the guide. One of "horizontal" or "vertical.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…. 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.

change legend text ggplot2

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:. 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. Create Example Data First, we have to create some data for the examples of this tutorial: set. Subscribe to my free statistics newsletter.

Leave a Reply Cancel reply Your email address will not be published. Subscribe to my free statistics newsletter:. Ignore Outliers in ggplot2 Boxplot in R Example.

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I have spent hours looking in the documentation and on StackOverflow, but no solution seems to solve my problem. When using ggplot I can't get the right text in the legend, even though it's in my dataframe. The tutorial Henrik mentioned is an excellent resource for learning how to create plots with the ggplot2 package.

Legends (ggplot2)

This can be achieved using the guides or labs functions from ggplot2 more here and here. Learn more. Editing legend text labels in ggplot Ask Question.

Asked 5 years, 11 months ago. Active 10 months ago. Viewed k times. Have a look at this tutorial to find out which data format ggplot is most happy with long, not wideand to get a feeling for the difference between mapping an aes thetic to a variable in the aes call, vs.

You need to melt your data to a long format, and map colour or fill in aes to the relevant variable. Active Oldest Votes. Jaap Jaap Sathish As you can see, the title of the y-axis is smaller than the title in the x-axis. The different sizes are used to illustrate the possibilities and its consequences.

change legend text ggplot2

Thus the code used in the answer is correct imo. Sathish Adding to my previous comment: it is certainly an option to do it that way!

Will add it to my answer. The legend titles can be labeled by specific aesthetic. Megatron Megatron 9, 6 6 gold badges 61 61 silver badges 76 76 bronze badges.

I disagree on that. I see you've modified it to reference the color aesthetic in labs. I offer my solution as an alternative. As of now, this appears to modify the legend if it is a fill gradient to be more nonsensical.

Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password.In order to create our example plot, we first need to create a data frame:. Our example data consists of two columns: A column containing some probability values and another column containing certain groups.

If we want to draw a ggplot2 plot of this data frame, we need to install and load the ggplot2 package to R:. Now, we can draw a barchart of our data as follows:. Figure 1: ggplot2 Barchart with Default Font Sizes. Figure 1 illustrates how our example plot looks like. The font sizes of our barchart are the default sizes.

We simply have to specify the element text size within the theme function as shown below:. Figure 2 shows the same graphics as Figure 1, but the font sizes of all text elements are much larger. So keep on reading!

Example 2 illustrates how to modify the font size of the axis labels. We can either change both axes…. With the following R syntax, we can change the size of the axis titles of our plot. We can adjust the size of all axis titles…. Have a look at the following R code and the corresponding barchart:.

We can also change how large the text elements of a ggplot2 legend are. With the following R syntax, we can increase the text size of the legend text:. Do you want to learn more about font sizes of ggplot2 plots? Then you may want to have a look at the following video tutorial of my YouTube channel.

Building a nice legend with R and ggplot2

I illustrate the R codes of this post in the video:.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.

change legend text ggplot2

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.

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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.By default, ggplot2 will automatically build a legend on your chart as soon as a shape feature is mapped to a variable in aes part of the ggplot call.

So if you use colorshape or alphaa legend will be available. Here is an example based on the mtcars dataset.

How to change the colours in ggplot2 graphs in R and RStudio

This post is gonna show how to use the theme function to apply all type of customization on this default legend. Note : this post is strongly inspired by the doc you get typiinig?? The labs function allows to change the legend titles. You can specify one title per section of the legend, i.

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

It is possible to remove a specific part or the whole legend thanks to the theme and the guides function. See code below:. To put it around the chart, use the legend. To put it inside the plot area, specify a vector of length 2, both values going between 0 and 1 and giving the x and y coordinates. This document is a work by Yan Holtz. Any feedback is highly encouraged. You can fill an issue on Githubdrop me a message on Twitteror send an email pasting yan.

Default legend with ggplot2 By default, ggplot2 will automatically build a legend on your chart as soon as a shape feature is mapped to a variable in aes part of the ggplot call. Related chart types. Contact This document is a work by Yan Holtz. Github Twitter.


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