Ggplot change legend title

Start by creating a box plot using the ToothGrowth data set. Change the box plot fill color according to the grouping variable dose.

A legend helps understand what the different plots on the same graph indicate. They basically provide labels or names for useful data depicted by graphs. In this article, we will discuss how legend names can be changed in R Programming Language. To change the legend title using this method, simply provide the required title as the value to its name attribute. Labs function is used to modify axis, labels, etc. It can be used to change the legend title by providing the appropriate title name to col attribute.

Ggplot change legend title

The goal of this R tutorial is to describe how to change the legend of a graph generated using ggplot2 package. Make sure that the variable dose is converted as a factor variable using the above R script. The allowed values for the arguments legend. Note that, the argument legend. In this case it is possible to position the legend inside the plotting area. Their values should be between 0 and 1. The R code below creates a scatter plot. The color and the shape of the points are determined by the factor variables cyl and gear, respectively. The size of the points are controlled by the variable qsec. In this case the argument guide is used as follow :. This analysis has been performed using R software ver. Data Example of plot Change the legend position Change the legend title and text font styles Change the background color of the legend box Change the order of legend items Remove the plot legend Remove slashes in the legend of a bar plot guides : set or remove the legend for a specific aesthetic Default plot without guide specification Change the legend position for multiple guides Change the order for multiple guides Remove a legend for a particular aesthetic Infos.

Data: mtcars. Create Improvement. Their values should be between 0 and 1.

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

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,y , where 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.

Ggplot change legend title

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.

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Help us improve. The second way is to change data frame so that the factor has the desired form. Set ggplot legend guides for each aesthetic when you have many legends. The size of the points are controlled by the variable qsec. In this case the argument guide is used as follow :. Please go through our recently updated Improvement Guidelines before submitting any improvements. Adding table within the plotting region of a ggplot in R. The first way is to tell the scale to use have a different title and labels. Change the order of the item in the legend. You can suggest the changes for now and it will be under the article's discussion tab. We will use ScatterPlot.

In this article, we will see how to change the legend title using ggplot2 in R Programming. We will use ScatterPlot. We use sample function to generate data for Users vector.

A legend helps understand what the different plots on the same graph indicate. How to Plot a Smooth Line using ggplot2 in R? This analysis has been performed using R software ver. Change Language. Open In App. You will be notified via email once the article is available for improvement. They basically provide labels or names for useful data depicted by graphs. Plot labels at end of ggplot line graph in R. 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. Similar Reads. 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. You will be notified via email once the article is available for improvement. Save Article Save. Skip to content.