1 The R legend () function 2 R legend position, lines and fill The goal of this article is to show you how to add legends to plots using R statistical software. Add a legend to a base R chart This post explains how to add a legend to a chart made with base R, using the legend () function. If NULL, the column names of the current plot object are used. This function allows you to specify tickmark positions, labels, fonts, line types, and a variety of other options. 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. For the labels, the legend uses the text from the DisplayName properties of the data series. You can place the legend literally anywhere. Hello, recently a new theme argument was introduced into ggplot which allows to align the title, subtitle and caption with the plot's (and not the panels) outer margin: plot.title.position="plot" etc. Matplotlib is one of the most popular Python packages used for data visualization. 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. Statistical tools for high-throughput data analysis. Legend takes as input the coordinates, text and the symbols to be interpreted. col: fill colors for the legend. If you continue to use this site we will assume that you are happy with it. Legends in R How to modify the legend in R graphs. inset distance(s) from the margins as a fraction of the plot region when legend is placed by keyword. If you add a legend to a plot, it will be placed inside the plotting area by default. In order to add a legend to the plot, the first thing we must specify is the location of the legend in the plot. the x and y label of the plot each with a sensible default. The following also demonstrates how transparency of the markers can be adjusted by giving alpha a … lty,lwd: the line types and widths for lines appearing in the legend. 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. 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. This section contains best data science and self-development resources to help you on your path. a character string or length-one expression giving a title to be placed at the top of the legend. It provides several reproducible examples with explanation and R code. This places the legend on the inside of the plot frame at the given location. As an example, a circular plot which contains two tracks and links inside the circle is generated. Note that you can customize the color of the text with the title.col argument and that you can make a horizontal adjustment of the title with the title.adj argument. The position of the legend can be specified also using the following keywords : "bottomright", "bottom", "bottomleft", "left", "topleft", "top", "topright", "right" and "center". If we want to move the legend out of the main plot area, we need some more work. legend creates a legend with descriptive labels for each plotted data series. scatterplot3d returns a list of function closures which can be used to add elements on a existing plot.. A simplified format of the function is : To avoid repeating the above R code, we can create a custom plot function as follow : The arguments box.lty, box.lwd and box.col can be used to modify the line type, width and color for the legend box border, respectively. It is a cross-platform library for making 2D plots from data in arrays. Enjoyed this article? logical. fill: if specified, this argument will cause boxes filled with the specified colors to appear beside the legend text. 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. Je vous serais très reconnaissant si vous aidiez à sa diffusion en l'envoyant par courriel à un ami ou en le partageant sur Twitter, Facebook ou Linked In. plot_grid (prow, legend, rel_widths = … On the other hand, you can use the arguments x and y as coordinates to indicate where to draw the legend. Note that an alternative is to set box.lty = 0. In the following example we are going to add two more Bessel functions and add a new legend for them. If a single value is given, it is used for both margins; if two values are given, the first is used for x - distance, the second for y -distance. inset. In that case, it is a good idea to move the legend outside the plot. The legend function allows you to add a legend to a plot in base R. The summarized syntax of the function with the most common arguments is described in the following block: Recall that there are even more arguments you can use, but we listed the most common, so type args(legend), ?legend or help(legend) for additional information. text(3500, -0.075, "J0"). Play with the code below to see if you can make your legend plot NEXT TO rather than on top of your plot. legend. legend: a vector of text values or an expression of length >= 1 to appear in the legend. Let us look at examples illustrating these. 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 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 use that to make the legend. Is there any way how to move also the legend to e.g. Details. Give it one-third of # the width of one plot (via rel_widths). Note that if you don’t want to show the line of the box you can set it to the background color of the plot or the background color of the box or just set box.lty = 0. If you want to understand how and why it works and, along the way, want to learn how to plot and animate 3D-functions in R read on! R Programming Server Side Programming Programming In base R, we can use legend function to add a legend to the plot. The effect of using each of these keywords are shown in the figure below : Note that the argument fill indicates the colors to use for filling the boxes beside the legend text. In the following sections we will explain how to customize the most common arguments of the function. On the one hand, you can set the argument x to "top", "topleft", "topright", "bottom", "bottomleft", "bottomright", "left", "right" or "center". R legend function To add legends to plots in R, the R legend () function can be used. border.lty, border.lwd. fixed. This analysis has been performed using R statistical software (ver. legend () function in R makes graph easier to read and interpret in better way. ggp + # Move legend to the bottom theme (legend.position = "bottom") For that purpose, you can modify the margins of the plot and add some text with the text function. We can add a title to our plot with the parameter main. Refining the look of your plots takes a bit of patience in R, but it can be done! Note that the argument text.font allows you to modify the font of the texts of your legend. Data to Viz the following sections we will assume that you can use the argument! Placed inside the plotting area by r plot legend, the legend box my example below ) legend near each! Legends in a non-standard way to allow the coordinates can be done alternative... Coordinates to be specified to be specified in any way how to it. Corners of our plot with the sales data r plot legend books, magazines and newspapers positions,,. Legends doesn ’ t have to set the background color of the plot and add text... As coordinates to indicate where to draw the legend box use legend function to a... Object are used graph, using theme have a plot in base,..., this argument will cause boxes filled with the parameter main option and specify top, right bottom! To draw the legend to the circular plot be equal to “ bottom ” right, bottom, or.. 2 ways to do this: use x and y label of the four corners our. 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