combine barplot and grid.table - r

Question

# I am trying to combine a horizontal beside barplot with the table
# with the values in it.
# E.g. original table, including sample_ids
df = data.frame(
sample_id=c("s01","s02","s03","s04","s05","s06","s07","s08","s09","s10"),
one=runif(10,0,10),
two=runif(10,0,10),
three=runif(10,0,10),
four=runif(10,0,10)
)
# I created a mydata that I then do barplot as matrix
mydata = data.frame(
one=df$one,
two=df$two,
three=df$three,
four=df$four
)
# Plotted, using rainbow colouring, with a legend in the top right
barplot(as.matrix(mydata),horiz=TRUE,beside=TRUE,col=rainbow(length(df$sample_id)), legend=paste(df$sample_id), args.legend = list(x = "topright", bty = "n"),xlim=c(0,20))
# Now I would like the grid.table to be on the bottom right, ideally with the same order and colouring as the legend
library(gridExtra)
grid.table(df)
# Any ideas?
# EDIT: also tried addtable2plot from plotrix, with no much success
bp = barplot(as.matrix(mydata),horiz=TRUE,beside=TRUE,col=rainbow(length(df$sample_id)), legend=paste(df$sample_id), args.legend = list(x = "topright", bty = "n"),xlim=c(0,20))
library(plotrix)
addtable2plot(bp, y=0, df,cex=0.3)
The other option would be to turn the barplot into a ggplot geom_bar, but I struggled to do it for more than 2 columns.

Answer 1

Here's one way to do it using addtable2plot of plotrix package. It allows you to use the legend positions such as "bottomright"
df = data.frame(
sample_id=c("s01","s02","s03","s04","s05","s06","s07","s08","s09","s10"),
one=runif(10,0,10),
two=runif(10,0,10),
three=runif(10,0,10),
four=runif(10,0,10)
)
mydata = data.frame(
one=df$one,
two=df$two,
three=df$three,
four=df$four
)
library(plotrix)
dev.off()
windows(width = 8, height = 6)
df$one = round(df$one,2)
df$two = round(df$two,2)
df$three = round(df$three,2)
df$four = round(df$four,2)
barplot(as.matrix(mydata),horiz=TRUE,beside=TRUE,col=rainbow(length(df$sample_id)),
legend=paste(df$sample_id),
args.legend = list(x = "topright", bty = "n", cex = 1),
xlim=c(0,20))
addtable2plot("bottomright",table = df, cex = .9, bty = "o",
bg = c("white","grey"), vlines = TRUE, xpad = .25)

Answer 2

If you want to make the barplot in ggplot2, you need to reshape your data into long format. Based on your example data, the following code:
library(ggplot2)
library(gridExtra)
library(reshape2)
bp <- ggplot(melt(df, id.vars = 1),
aes(x = variable, y = value, fill = sample_id)) +
geom_bar(stat = 'identity', position = 'dodge') +
scale_fill_manual(values = rainbow(10)) +
labs(x = NULL, y = NULL) +
coord_flip() +
theme_minimal(base_size = 14)
gt <- tableGrob(df, rows = NULL, theme = ttheme_minimal())
grid.arrange(bp, gt, ncol = 2, widths = c(2.5,2))
which gives the following result: