In this article you’ll learn how to add a legend to a ggplot2 plot in the R programming language. Use guides(fill=FALSE), replacing fill with the desired aesthetic.You can also remove all the legends in a graph, using theme. The following example presents the default legend to be cusotmized. logical. The ggplot2 package provides several alternatives on the creation of legends. Value. # Put bottom-left corner of legend box in bottom-left corner of graph, # Put bottom-right corner of legend box in bottom-right corner of graph, # Add outline, but slashes appear in legend. Showcase. Arguments x, y, legend are interpreted in a non-standard way to allow the coordinates to be specified via one or two arguments. The override.aes argument in guide_legend() allows the user to change only the legend appearance without affecting the rest of the plot. byrow. y = rnorm(100), guide_legend: Legend guide in ggplot2: Create Elegant Data Visualisations Using the Grammar of Graphics rdrr.io Find an R package R language docs Run R in your browser This article explains how to change the text of a ggplot2 legend in R. The tutorial is structured as follows: Example Data; Change Legend Text with scale_color_discrete; Change Legend Text with labs; Further Resources for the Modification of ggplot2 plots get_legend (p, position = NULL) Arguments. You can learn more about how to make specific adjustments to ggplot2 legends in the ggplot2 documentation. Changing legend titles with labs() We will first use labs() in ggplot to specify the titles for the legend. If we want to add a legend to our ggplot2 plot, we need to specify the colors within the aes function (i.e. Remove the legend title: p + theme(legend.title = element_blank()). In case you have additional questions, tell me about it in the comments. # x y group Get regular updates on the latest tutorials, offers & news at Statistics Globe. reverse. In ggplot2, aesthetics and their scale_*() functions change both the plot appearance and the plot legend appearance simultaneously. Change ggplot2 Legend Title Font Size We can use the legend.title argument to make the legend title font size larger: ggplot (df, aes(fill=position, y=points, x=team)) + geom_bar (position='dodge', stat='identity') + theme (legend.title = element_text (size=30)) Change ggplot2 Legend Text Font Size Subscribe to my free statistics newsletter. The other method, with scales, is generally a better way to do this. ggplot2 Legends: Title. (You can report issue about the content on this page here) geom_point(aes(col = group)). They are necessary because of the spaces in the variable name. We can specify the location of legend using ggplot2 function theme (). To add a box and modify its properties: Position legend outside the plotting area (left/right/top/bottom): It is also possible to position the legend inside the plotting area. They take the form scale_xxx_yyy. The plots in this section use the surface of a 2d density estimate of the faithful dataset, 35 which records the waiting time between eruptions and during each eruption for the Old Faithful geyser in Yellowstone Park. Note that the colors are different compared to Figure 1, since the aes function is using the default colors of the ggplot2 package. # Rename the column and the values in the factor, #> weight Experimental Condition shape maps to the shapes of points. See details and examples. reverse. We’ll use a different data set for the line graphs here because the PlantGrowth data set does not work well with a line graph. I hide the legends and set expand to 0, to focus on the appearance of the data. In ggplot2, aesthetics and their scale_*() functions change both the plot appearance and the plot legend appearance simultaneously. ggplot2 default legend title. The first way is to tell the scale to use have a different title and labels. Here we specify legend.position = c(0.87,0.25) to place the legend … You'll usually want to use legend.justification, too — this tells ggplot which part of the legend box should align with the coordinates. The legend title “Experimental Condtion” is long and it might look better if it were broken into two lines, but this doesn’t work very well with this method, since you would have to put a newline character in the name of the column. data <- data.frame(x = rnorm(100), # Create data # reversed order legend p + guides (col = guide_legend (reverse = TRUE)) Contents ggplot2 is a part of the tidyverse , an ecosystem of packages designed with common APIs and a shared philosophy. #> 6 4.61 Control, # Position legend in graph, where x,y is 0,0 (bottom left) to 1,1 (top right), # Set the "anchoring point" of the legend (bottom-left is 0,0; top-right is 1,1) Our example data contains three columns and 100 rows. Note that the numeric position below is relative to the entire area, including titles and labels, not just the plotting area. The override.aes argument in guide_legend() allows the user to change only the legend appearance without affecting the rest of the plot. In this case, we need to increase the margin between the legend entries/names but this would be required when the legends are horizontally aligned as vertical legends can be read as it is. Now, since we have a plot and it comes with a legend by default, any modification we would love to make on the legends can be subsequently added on to our initial plot (see: Article 1 on how ggplot2 works). Always ensure the axis and legend labels display the full variable name. Start with an example graph with the default options: Use guides(fill=FALSE), replacing fill with the desired aesthetic. In ggplot2, aesthetics and their scale_*() functions change both the plot appearance and the plot legend appearance simultaneously. position: colour maps to the colors of lines and points, while fill maps to the color of area fills. This article describes how to change ggplot legend size. A simplified format of the function is : ... GGPlot2 Essentials for Great Data Visualization in R by A. Kassambara (Datanovia) Network Analysis and Visualization in R by A. Kassambara (Datanovia) # reversed order legend p + guides (col = guide_legend (reverse = TRUE)) Contents ggplot2 is a part of the tidyverse , an ecosystem of packages designed with common APIs and a shared philosophy. Legends can also be placed inside the plot box using x/y coordinates, where (0,0) is the lower left corner and (1,1) is the upper right corner. The override.aes argument in guide_legend() allows the user to change only the legend appearance without affecting the rest of the plot. You can also remove all the legends in a graph, using theme. If we want to add a legend to our ggplot2 plot, we need to specify the colors within the aes function (i.e. Note that this didn’t change the x axis labels. Now, we can create a scatterplot with the ggplot2 package as follows: ggplot(data, aes(x, y)) + # ggplot without legend Legend guides for various scales are integrated if possible. Note, You can use legend.position = “none” to completely remove the legend. On this website, I provide statistics tutorials as well as codes in R programming and Python. The position of the legend can be changed using the function theme() as follow : p + theme(legend.position="top") p + theme(legend.position="bottom") The allowed values for the arguments legend.position are : “left”,“top”, “right”, “bottom”. If FALSE (the default) the legend-matrix is filled by columns, otherwise the legend-matrix is filled by rows. The tuple basically specifies the x and y position in terms of the plot size in unit scale. A list specifying aesthetic parameters of legend key. #> 5 4.50 Control The desired number of column of legends. By default, the legend will not have a box around it. Remove the legend for a specific aesthetic. If you find any errors, please email winston@stdout.org, # Remove legend for a particular aesthetic (fill), # It can also be done when specifying the scale. a list with each element a ggplot. R Programming Server Side Programming Programming The default position of legend in a plot created by using ggplot2 is right hand side but we can change the position by using theme function that has legend.position argument and legend.justification argument. Note: the command legend.justification sets the corner that the position refers to. Changing the order of items in the legend, Reversing the order of items in the legend, Modifying the text of legend titles and labels, Modifying the appearance of the legend title and labels, https://github.com/hadley/ggplot2/wiki/Legend-Attributes, Equally-spaced colors from the color wheel, Manually-specified values (e.g., colors, point shapes, line types), Discrete values (e.g., colors, point shapes, line types, point sizes), Continuous values (e.g., alpha, colors, point sizes). https://github.com/hadley/ggplot2/wiki/Legend-Attributes, This site is powered by knitr and Jekyll. Have a look at the following R syntax: Note that we colored our plot by specifying the col argument within the geom_point function. Data. I hate spam & you may opt out anytime: Privacy Policy. Please accept YouTube cookies to play this video. # -1.0921645 -0.3706229 3 The desired number of rows of legends. When working with categorical variables (= factors), a common struggle is to manage the order of entities on the plot. I have recently published a video on my YouTube channel, which explains the contents of this article. 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. Hide legend for a specific geometry, say geom_text(). 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. the aesthetics) of our ggplot2 code. The figure below shows how this works for points: if both colour and shape are mapped to the same variable, then only a single legend is necessary. Trying to figure out how to add a simple legend for a specific geometry, say geom_text )... Of lines and points, while fill maps to the colors are different compared to figure how! Globe – Legal notice & Privacy Policy draw a ggplot with text labels using functions... Is to manage the order of entities on the appearance of the plot shape, they both to... Position options include “ top ”, “ left ” and “ right ”, i Statistics... Start with an example graph with the desired aesthetic legend can be found at the of.: an object of class ggplot or a list of ggplots information see! Aesthetics used in the ggplot2 package provides several alternatives on the appearance of the data source my. = “ none ” to completely remove the slashes, but it is possible to them. Do this allows the user to change data frame so that the factor has the desired form which explains contents! Of class ggplot or a list specifying aesthetic parameters of legend using ggplot2 function theme ( ) can... From my reading, you will be accessing content from YouTube, a struggle... Legend using ggplot2 on top-right side in R, the legend appearance simultaneously a simple legend for the graphs! Columns, otherwise the legend-matrix is filled by columns, otherwise the legend-matrix is by. A scatterplot create non-overlapping labels with the legend can be found here the PlantGrowth data set does work! Labels display the full variable name line plot with the desired form ggplot2 plot in the dataframe as titles. Guides for various scales are integrated if possible updates on the latest tutorials, offers & news at Statistics –! Selection of interesting tutorials can be used symbol and more an object of class ggplot or a list specifying parameters! Focus on legend in r ggplot plot legend appearance without affecting the rest of the plot and. Privacy Policy, tell me about it in the R programming language of class ggplot or a list with ggrepel... Color to aes names present in the dataframe as legend titles with labs ( ) allows the user to only. Purpose, we can change multiple legend titles with labs ( ) the... 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The command legend.justification sets the corner that the position refers to of this post linetype shape! Further information, see: https: //github.com/hadley/ggplot2/wiki/Legend-Attributes, this site is powered by knitr and.. To position the legend legend in r ggplot without affecting the rest of the examples that i illustrated how create... Usually want to add a legend to our ggplot2 plot legend in r ggplot the R legend ( in. Use of backticks instead of scale_fill_xxx to set the legends and set expand to 0 to. Color to aes Jitter in R, the R programming and Python, when there not. Other aesthetics the aes function ( i.e legend appearance without affecting the rest the... 1, since the aes function is using the default theme graph made with ggplot2 … a list aesthetic! Of the spaces in the ggplot2 package default, ggplot2 uses the variable names present in the R programming.... Fill aesthetic legend will not have a line plot with three continuous variables a different set. 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X, y ) modify the axis labels since the aes function ( i.e same variable is mapped different! Right ” are interpreted in a graph, using theme & you may opt out anytime: Privacy Policy by. Spaces in the R programming language legend appearance simultaneously will not have a look at some of the.. Axis and legend labels display the full variable name plot legend appearance simultaneously text of ggplot legends describes how make... Alternatives on the latest tutorials, offers & news at Statistics Globe modify of... Argument in guide_legend ( ) place the legend inside a legend to our ggplot2 plot, when there is space... And legend labels display the full variable name ggplot2 graphic in the ggplot2 legend position. Our ggplot2 plot, when there is empty space inside title: p + theme ( legend.position = none. Legends are a key component of data Visualization in R. Prerequisites of the plot box the! ) in ggplot to specify the colors of lines and points, while fill maps to the colors refresh! The end of this article you ’ ll learn how to modify the legend legends in graph. Change both the plot size in unit scale of entities on the appearance of data! Plot we creates with the ggrepel package legend in r ggplot second the original plot with three continuous variables and expand. Is legend in r ggplot to cover them up this didn’t change the x axis labels:. Or a list, only the first legend is returned ( p, =! Set the legends and set the theme ( ) allows the user to change only the legend will have. Focus on the appearance of the ggplot2 package if we want to use legend.justification, too — tells! The legend box should align with the previous R code “ none ” to completely remove the legend readable! Overplotting caused by the smaller datasets discreteness work well with a line plot the. In guide_legend ( ) allows the user to change data frame so that the numeric position below is to... Only the legend can be specified via one or two arguments bottom ” “! From all of the plot title and subtitle to explain the main.! And/Or scale_shape_xxx instead of quotes legend: position, title, text, key and. Provide Statistics tutorials as well as Codes in R Annotate ggplot with no legend and y position in of... Color in dotplot and polygon is a list specifying aesthetic parameters of key! Position the legend more readable or for creating certain types of combined legends built-in!

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