Note that the colors are different compared to Figure 1, since the aes function is … ggplot2 comes with a number of built in themes. 16.2 Complete themes. # extract a legend that is laid out horizontally legend_b <-get_legend (p1 + guides (color = guide_legend (nrow = 1)) + theme (legend.position = "bottom")) # add the legend underneath the row we made earlier. If you only want to change the legend text labels and not the colours from ggplot's default palette, you can use scale_color_hue(labels = c("T999", "T888")) instead of scale_color_manual(). This means a color … When we want to change the default theme, for example to the black and white theme, we just add at the end of the plot theme_bw().So basically a theme is just a function with a number of arguments set by default, such as background color, size and style of axis text and labels, legend, etc. Figure 2: ggplot2 Plot with Legend.

Also, I want to know how to change the following labels as numbered in the pic below. Convert that legend to a graphic. plot_grid (prow, legend_b, ncol = 1, rel_heights = c (1, .1)) Example 1: Change Text of ggplot Legend Title with scale_color_discrete I want you to use the same plot as shown above in pic, while satisfying the conditions above. This is a very useful feature of ggplot2. Give it 10% # of the height of one plot (via rel_heights). As you can see based on Figure 2, we just added a legend to our plot, by moving the col argument within the aes function in the first line of the code. 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. arrange() arrangeGrob() and plots axis_scale: Change Axis Scale: log2, log10 and more background_image: Add Background Image to ggplot2 bgcolor: Change ggplot Panel Background Color border: Set ggplot Panel Border Line. In the following examples, I’ll show you two alternatives how to change the text of this legend title in R. Let’s dive in! Adding color gradient using geom_segment() I wanted the background of the plot to go from light to dark back to light through time.

What happens when we call a specific ggtheme function. answered Dec 10, 2018 by Kailash