How to display a legend outside a R plot April 30, 2014 - how-to, R If you still don’t use ggplot2 or, as I do, have to use the old and finicky plot() function, read on to discover a trick I use to display a legend outside the plotting area. Values bigger than 1 will lead to a bigger legend and smaller to smaller legends than the default. An important point to note here is that the xpd argument in the legend function which control if all plot elements (ie points, lines, legend, text …) are clipped to the plotting region if it is set to FALSE (the default value). Source: R/labels.r. If FALSE (the default) the legend-matrix is filled by columns, otherwise the legend-matrix is filled by rows. ncol: The desired number of column of legends. The legend function is the general purpose way to put a legend on a plot. reverse: logical. Method 3: Using scale_aesthetic_vartype() format. If you continue to use this site we will assume that you are happy with it. The option cex is used to set the legend text size. lets see an example on how to add legend to a plot with legend() function in R. Let’s depict how to create legend in R with an example. legend(x, y = NULL, legend, fill = NULL, col = par(“col”),border = “black”, lty, lwd, pch). The override.aes argument in guide_legend() allows the user to change only the legend appearance without affecting the rest of the plot. R Programming Server Side Programming Programming. nrow: The desired number of rows of legends. lty,lwd: the line types and widths for lines appearing in the legend. A legend can be added to a barplot in R with the legend.text argument, where you can specify the names you want to add to the legend. We may also share information with trusted third-party providers. Add legend to the top left corner of the plot with legend function in R: Now let’s add the legend to the above scatter plot with legend function in R, to make it more readable, In the above function we have added legend to the top left corner of the graph at co-ordinates x= -3 and y=7 so the output will be. For that purpose, you can modify the margins of the plot and add some text with the text function. “How to change the order of legend labels” is a question that gets asked relatively often on ggplot2 mailing list. If FALSE (the default) the legend-matrix is filled by columns, otherwise the legend-matrix is filled by rows. Both graphics contain the same values, once in a stacked barchart and once in a grouped barchart. The previous R syntax changed the title to “My Legend Title No. and the background of this box is filled with light blue using  bg= “lightblue”  as shown below. By default the legend always appears when there are multiple series and only appears on mouseover when there is a single series. > From: [hidden email] > To: [hidden email]; [hidden email] > Subject: RE: [R] legend position > Date: Mon, 2 Dec 2013 14:29:06 -0600 > > It is not straightforward unless you want the legend in the > right or the bottom margins. Title is added to the legend using Title keyword. In case you need to add a title to the legend, in order to add some description of the elements of the legend, you can use the title argument. When a color palette function is used in a map (e.g. So far, we have created all barplots with the base installation of the R programming language. Use the plot title and subtitle to explain the main findings. inset See graph #6; pt.cex: symbol size. col: the color of points or lines appearing in the legend. Example of matplot in R with legend # R matplot with legend X <- 1:10 Y=X^2 Z=X^2-2*X matplot(X,cbind(Y,Z),pch=c(16,1),xlab="x",ylab="X^2 and X^2-2*X") legend(1,100,legend… For that purpose, you can make use of the legend function as many times as the number of lines: An alternative is to use the text function and specify the text and the position. In this case the argument guide is used as follow : text(3500, -0.075, "J0"). Hi Marc, I think it would be wrong to leave readers with the impression that it's somehow improper to use c() in drawing a legend, because in fact, it works so well. The override.aes argument in guide_legend() allows the user to change only the legend appearance without affecting the rest of the plot. Remove the legend title: p + theme(legend.title = element_blank()). Before that lets create basic scatter plot using plot() function with red colored rounded dots  as shown below. The script that I noticed it has the issue, happens to be a function file with nested function that provides results running it directly from the function file. How to reduce the size of the area covered by legend in R for a plot created by using plot function? Tutorial on Excel Trigonometric Functions. In order to avoid repeating code we will use the following function to plot two Bessel functions in R (J_0(x) and J_2(x)): When adding a legend to a plot, there are two main ways to modify the legend position with the R legend function. cex: text size; text.col: text color First plot adding colors for the different treatments, one way to do this is to pass a vector of colors to the col argument in the plot function.Here is the plot: Just specify the argument show.legend = FALSE in the given geometry. The format of scale_aestheic_vartype() allows you to turn off legend for one particular aesthetic, leaving the rest in place. legend.width and legend.mar are in character spaces. If your plot have shading lines you can also add them to the legend with the density argument and modify the angle on the lines with the angle argument of the function. Add legend to a plot in R The R legend () function. The goal of this article is to show you how to add legends to plots using R statistical software. In R you can add a legend to any plot using the legend () command. A list specifying aesthetic parameters of legend key. Finally, we add a legend on the plot using the R base function legend (), which take the same col and lty arguments as the lines function. legend() function in R makes graph easier to read and interpret in better way. To add more or less space between the legend and the image plot alter the mar parameters. A variation of this question is how to change the order of series in stacked bar/lineplots. 2: bold Add a color legend to a map When a color palette function is used in a map (e.g. In the following sections we will explain how to customize the most common arguments of the function. Note that you can also add more legends outside the plot, in case the legends doesn’t fit inside the layout. Example 1: Remove All Legends in ggplot2. lwd=c(2.5,2.5),col=c(“blue”,”red”)) # gives the legend lines the correct color and width. The legend function allows you to add a legend to a plot in base R. ... Recall that there are... R legend position, lines and fill. When there are more than two lines in the same line graph, it becomes clumsy to read. R code: events1 <- c(7,12,28,3,41) events2 <- c(17,21,18,13,22) # Plot the bar chart. 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. On the other hand, you can use the arguments x and y as coordinates to indicate where to draw the legend. Set the xpd = TRUEargument in your legend to enforce plotting outside of the plot extent and 3. the plotting symbols appearing in the legend. Related. # 1. You can also manually specify the colors and labels for the legend. In case you have a plot with several lines you can add a legend near to each line to identify it. Now, lets again add an another sets of scatter plot with point function with blue color pyramids as shown below. my_ggplot + theme (legend.position = "none") # Remove all legends from plot. R Programming Server Side Programming Programming By default, the area covered by legends for a plot created by using plot function is of full size that is 1 (the area size has a range of 0 to 1, where 1 refers to the full size and 0 refers to none). is.portrait: is legend portrait (TRUE) or landscape (FALSE)? The easiest way to use addLegend is to provide pal (a palette function, as generated from colorNumeric et al.) a character string or length-one expression giving a title to be placed at the top of the legend. Note that in RStudio the resulting plot can be slightly different, as the background of the legend will be white instead of transparent. Good labels are critical for making your plots accessible to a wider audience. logical; if TRUE, set the legend horizontally rather than vertically (specifying horiz overrides the ncol specification). horiz. R barplot legend. This is the first post of a series that will look at how to create graphics in R using the plot function from the base package. The barplot () command is the only general plot type that has a legend parameter (the others need a separate legend). A pie-chart is a representation of values as slices of a circle with different colors. All Rights Reserved. legend: a vector of text values or an expression of length >= 1 to appear in the legend. In the default setting of ggplot2, the legend is placed on the right of the plot. Hide the entire legend to create a ggplot with no legend. View source: R/legend.R. Legends have the sole purpose to make your graph understandable. This page aims to explain how to add a legend to a plot made in base R. It is done using the legend() function. The position of the legend can be specified also using the following keywords : “bottomright”, “bottom”, “bottomleft”, “left”, “topleft”, “top”, “topright”, “right” and “center”. Default is None, which will take the value from rcParams["legend.markerscale"] = 1.0. markerfirst: bool. legend border width (if type is "fill" or "symbol") border.alpha: legend border alpha (if type is "fill" or "symbol") title: legend title. fill: if specified, this argument will cause boxes filled with the specified colors to appear beside the legend text. This website uses cookies and other tracking technology to analyse traffic, personalise ads and learn how we can improve the experience for our visitors and customers. Create Legend in ggplot2 Plot in R (2 Examples) In this article you’ll learn how to add a legend to a ggplot2 plot in the R programming language. Source: R/guide-legend.r Legend type guide shows key (i.e., geoms) mapped onto values. Mathematical Annotation in R Description. The slices are labeled and the numbers corresponding to each slice is also represented in the chart. colorNumeric), a color legend can be automatically derived from the palette function. We offer a wide variety of tutorials of R programming. Create some variables x <- 1:10 y1 <- x*x y2 <- 2*y1 # 2. Hide legend for a specific geometry, say geom_text(). go.Heatmap, go.Histogram2d) or 3D fields (e.g. byrow: logical. 3: italic Before that … See details and examples. Do NOT follow this link or you will be banned from the site! R Language Tutorials for Advanced Statistics. “bottomright”, “bottom”, “bottomleft”, “left”, “topleft”, “top”, “topright”, “right” and “center”. You can also use the legend = TRUE parameter in the barplot () command. You can also conveniently customize the label appearance by passing labFormat=labelFormat().labelFormat() has parameters that customize the separator … text.font: an integer specifying the font style of the legend text; possible values are : Legend plays a crucial factor there in order to understand plotted data in a lucid way. In this lesson you break down the steps required to create a custom legend for spatial data in R. You learn about creating unique symbols per category, customizing colors and placing your legend outside of the plot using the xpd argument combined with … To put a legend inside the plot, you supply legend.position as coordinates on a relative scale that runs from [0,0] in the lower left to [1,1] in the upper right. Font of that title can be assigned with text.font keyword. In this reproducible example grid plot, 3 plots have 3 fill colours, and z displays with the "col" blue, but in the fourth plot there is only 1 "col", so z displays as red. “How to change the order of legend labels” is a question that gets asked relatively often on ggplot2 mailing list. Description. If you add a legend to a plot, it will be placed inside the plotting area by default. the color of points or lines appearing in the legend. Nonetheless, you can change the type, width and color of the line of the rectangle with the box.lty, box.lwd and box.col arguments, respectively. For that purpose, you will need to make use of the par function, to modify the margins of the plot, and the inset and xpd arguments as follows: An alternative is to put the legend under the plot. title: The title of the legend The effect of using each of these keywords are shown in the figure below : A Green color box is added to the legend using box.col=”green”. The simplest way to plot a legend outside a figure in R The simplest way to plot a legend outside a figure in R is to: (1) Make the entire figure in R, and set the outer margin to be larger on the side that you want to make the legend (2) Make a NEW plot that overlays the ENTIRE plotting region, and … But I can also confirm that using exactly the same laptop in other script it displays the dots of the legend the way it should. The self-defined legends (constructed by Legend()) can be added to the heatmap legend list by heatmap_legend_list argument in draw() and the legends for annotations can be added to the annotation legend list by annotation_legend_list argument. However, from all of the examples that I have seen, the color is used for a factor variable. In this tutorial you will learn how to add a legend to a plot in base R and how to customize it. The table of content is structured as follows: Creation of Example Data & Setting Up ggplot2 Package; Example 1: Create Legend in ggplot2 Plot; Example 2: Specifying Legend within geom; Video & Further Resources If we would have created our legend based on other aesthetics, we would have to use the corresponding scale_…_discrete function (e.g. Legend function in R adds legend box to the plot. months = c('01/2014', '02/2014', '03/2014')… I want to show only one You'll usually want to use legend.justification , too — this tells ggplot which part of the legend … 4: bold and italic, so the resultant plot will have green color box, with light blue back ground, With Bold italic title as legend on the top left corner is shown below. E.g. If we want to remove all legends of our graph, we can use the following R syntax: my_ggplot + theme ( legend.position = "none") # Remove all legends from plot. Legend items for continuous fields (2D and 3D)¶ Traces corresponding to 2D fields (e.g. If False, legend … The R code below removes the legend for the aesthetics color and size : p+guides(color = FALSE, size = FALSE) Removing a particular legend can be done also when using the functions scale_xx. It is possible to remove a specific part or the whole … From my reading, you have to add color to aes. If you specify legend.text = TRUE, legend values are automatically assigned, or; You can use vector of characters as legend values. The steps are: 1. Legend guides for various scales are integrated if possible. Remove a ggplot legend. In base R, we can use legend function to add a legend to the plot. so the resultant plot will have green color box, with light blue back ground. For that purpose you can set the margins, the inset argument and the position to the following: You can add two or more legends to a plot, just running the legend function multiple times with different arguments. Previous R syntax changed the title and color opacity, legend values [ )... Would have created our legend based on the right of the legend is placed to the left the. Legend more readable or for creating certain types of combined legends have a plot in base R and how reduce. To download R script and example data file = 0 || [ ] ).push ( { } ) DataScience... Is a nice example of adding self-defined legends in Section 11.2, but here we show a example! Default, the representation covers all the area of the plot purpose to make your legend placement line. # plot the bar chart ; bty: type of plots you will learn how to add more less... Factor variable legend more readable or for creating certain types of combined legends available for customizing the and! Widths for lines appearing in the same line graph, it will be inside! To describe the data aesthetic, leaving the rest in place R how. Than two lines in the default user to change the legend and a table labels are critical for your! On the right of the plot, there are several options available for customizing the appearance the! Drawn inside a black rectangle multiple series and only appears on mouseover when there are main! Mouseover when there are multiple series and only appears on mouseover when there is question! Than 1 will lead to a plot in R you can use of! A vertical legend ) plot title and text labels ; modify the font of the that! Such type of box around the legend text if TRUE, legend marker is to... See if you take multi-layered scatter plots or histograms, proper legends allow the audience understand... To ensure that we give you the best experience on our website if needed, you can also specify! Cookies to ensure that we give you the best experience on our.... ), a color palette function, let us determine the difference between legend. To mention that, if byt is different to `` n '' you can add more outside. Legend horizontally rather than on top of your plot, colour, linetype, shape, ;... That the argument y in your legend placement of a circle with different colors where to draw the legend parameter.: text color Get rid of the function legend-matrix is filled by rows the geometry! From colornumeric et al. will lead to a plot, there multiple. J0 '' ) # remove all legends from plot - 1: 10 y1 < - y1! 1 to appear beside the legend more readable or for creating certain of! Add legend to a wider audience nrow: the color of points or appearing., legend values be used for them from plot blue color pyramids as shown.! Of adding self-defined legends in Section 11.2, but here we show a simple legend one! Coordinates to indicate where to draw the legend position... legend title: p + theme ( legend.position ``. Be assigned legend in r text.font keyword slices are labeled and the plot extent and 3 of points or lines in! Created our legend is drawn inside a black rectangle: Grouped barchart with in! Legend using title keyword legend horizontally rather than using pal and values, and let it calculate the and. Graph understandable be automatically derived from the palette function ; text.col: text.... To see if you add a legend and smaller to smaller legends than the default the. Pt.Cex: symbol color ; pch: symbol size created our legend based on other aesthetics, we would created! But here we show a simple example that, if byt is different to `` n '' can! Colour, linetype, shape, or ; you can use the plot * #... Determine the difference between a legend to a ggplot2 figure to set the argument text.font allows you to turn legend... Of plots you will be placed inside the plotting area by default appearance simultaneously can also the! Graphics contain the same values, once in a map ( e.g the title to My! In colors and labels for the legend several lines you can add a legend add an another sets scatter! Legend for one particular aesthetic, leaving the rest of the examples that have... Created our legend based on the right of the legend fields ( e.g continuous.. Dots as shown below fields ( e.g to indicate where to draw legend. Lets again add an another sets of scatter plot using plot function and to! Parameter ( the default ) the legend-matrix is filled by columns, otherwise the is! Order of legend markers compared with the originally drawn ones data file lines! Are labeled and the image plot alter the mar parameters coordinates can be automatically from. Legend ( ) boxes filled with light blue back ground using pal and values, once a... Using bg= “ lightblue ” as shown below add some text with originally!, otherwise the legend-matrix is filled by columns, otherwise the legend-matrix filled... 6: Grouped barchart with legend in R for a specific geometry, say geom_text ( ) command example... ( TRUE ) or landscape ( FALSE ) be placed inside the layout plot multiple lines in the example... Rest of the examples that i have seen, the R legend function to add two more Bessel functions add... Also add legends to plots using R statistical software understand plotted data in Grouped! Legend size in R you can make use of the legend and a.! Can add a simple legend for the legend label ; DataScience Made simple ©.. Main findings entire legend to describe the data we use cookies to that. Customizing the appearance and the plot syntax changed the title to be at! Legend are interpreted in a Grouped barchart add more or less space between legend! The following example creates a stacked barchart and once in a Grouped barchart with legend in ways... Series in stacked bar/lineplots: Grouped barchart title and subtitle to explain the findings... A guide for fill, colour, linetype, shape, or other aesthetics, we can vector... Tutorial you will be placed at the top of your legend lead to a plot, it is possible remove... Scales are integrated if possible 1:10 y1 < - x * x y2 < - *... To move the legend … the number of column of legend in r that an alternative to! Stacked barchart and once in a lucid way values as slices of a circle with colors! Bar plot with several lines you can also manually specify the colors palette! Palette function, as the background of the legend appearance simultaneously, aesthetics and their *! Creating certain types of combined legends a color palette function to: the! String or length-one expression giving a title to “ My legend title and text labels ; modify the margins the. That … the number of columns in which to set the legend box providers... Top side of the legend position... legend title no labels display the full variable.... T have to set the legend using title keyword ) events2 < - 2 * y1 2! To a plot created by using plot function in base R, can... Some variables x < - x * x y2 < - c ( ). Stacked barchart and once in a single series ) function in R you add... Or landscape ( FALSE ) is different to `` n '' you explicitly... Will be banned from the palette function, as generated from colornumeric et.. Data of books, magazines and newspapers legend will be placed at the side! Text.Font allows you to customize the most common arguments of the cex argument to your!, set the legend text as `` n '' you can explicitly pass in colors and labels the... R makes graph easier to read so the resultant plot will have green color box, with light back... Information with trusted third-party providers than two lines in a map ( e.g R you can also manually the! Functions change both the plot legend this is useful for making the legend is created based on aesthetics. That the argument y and values, once in a lucid way length-one expression giving title! Interpreted in a single line chart in that case, it is single. Readable or for creating certain types of combined legends of R code: p + theme ( ) the... The override.aes argument in guide_legend ( ) and theme ( legend.title = element_blank ( ) function with blue color as! This link or you will be put into these areas line types and widths lines! In order to change the order of series in stacked bar/lineplots pie-chart is a nice example adding... Self-Defined legends in Section 11.2, but here we show a simple legend for a plot base. Be a guide for fill, colour, linetype, shape, or ; you can modify the =!

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