about boxplots

[lily li]

Hi ggplot users,

I have a question about the boxplot. For example, one dataframe DF1 is like the following. There are just three columns: A, B, and C. I want to draw each column as one boxplot in a figure, so there will be three boxplots in one figure. The x-axis lable is 'A', 'B', and 'C'. 

If I have another dataframe DF2 that has the same structure. How to do the same for DF2, and then plot the panel for DF2 below panel DF1, so there will be just one x-axis? Thanks for your help.

DF1

        A  B  C

1     65 21 54

2     66 23 55

3     54 24 56

4     44 23 53

5     67 22 52

6     66 21 50

7     45 20 51

8     56 19 57

9     40 25 58

10   39 24 53

[Roman Luštrik]

This is fairly easy to do, many solutions available online. Try searching something along the lines of "how to plot multiple graphs ggplot2 r".

Here's a working solution for two data.frames but can be extended to more.

library(tidyr)

library(ggplot2)

df1 <- data.frame(a = rnorm(30), b = rnorm(30, mean = 10), c = rnorm(30, mean = -5))

df2 <- data.frame(a = rnorm(30, mean = 5), b = rnorm(30, mean = 1), c = rnorm(30, mean = 2))

df1$origin <- "df1"

df2$origin <- "df2"

mdf <- do.call(rbind, list(df1, df2))

xx <- gather(mdf, key = vars, value = vals, -origin)

ggplot(xx, aes(x = vars, y = vals)) +

  theme_bw() +

  geom_boxplot() +

  facet_wrap(~origin, ncol = 1)

Cheers,

Roman

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