Adding Text Outside of ggplot

[zman3]

A <- c(1, 2, 3, 4, 5, 6, 7, 8, 9, 10)
B <- c(10, 9, 8, 7, 6, 5, 4, 3, 2, 1)
C <- data.frame(A, B)

ggplot(data = C) + geom_point(mapping = aes(x = A, y = B)) + 
    labs(title = "Plot") + theme(plot.title = element_text(hjust = 0.5))

What I would like to do is add text outside of my plot so that it looks something like (I used Microsoft Paint after exporting to image):

[alistaire]

You could do it with gridExtra::tableGrob (maybe making two plots and joining them), but it's a bit of low-level work.

[cderv]

@alistaire

You could do it with gridExtra::tableGrob

there is vignette with about this:
https://cran.r-project.org/web/packages/gridExtra/vignettes/tableGrob.html
and there is a grid.arrange function

And I think cowplot could help to arrange or ggpubr

A <- c(1, 2, 3, 4, 5, 6, 7, 8, 9, 10)
B <- c(10, 9, 8, 7, 6, 5, 4, 3, 2, 1)
C <- data.frame(A, B)

library(ggplot2)
p <- ggplot(data = C) + 
  geom_point(mapping = aes(x = A, y = B)) + 
  labs(title = "Plot") + 
  theme(plot.title = element_text(hjust = 0.5))

tab <- as.data.frame(
  c(
    Variable_1 = 0.5,
    Variable_2 = 0.000035,
    Variable_3 = "House"
  )
)
# using gridExtra
library(gridExtra)
p_tab <- tableGrob(unname(tab))
grid.arrange(p, p_tab, ncol = 2)

# using cowplot
library(cowplot)
#> Warning: le package 'cowplot' a été compilé avec la version R 3.5.2
#> 
#> Attachement du package : 'cowplot'
#> The following object is masked from 'package:ggplot2':
#> 
#>     ggsave
ggdraw() +
  draw_plot(p, width = 0.6) +
  draw_plot(p_tab, x = 0.6, width = 0.4)

# using ggpubr
library(ggpubr)
#> Le chargement a nécessité le package : magrittr
#> 
#> Attachement du package : 'ggpubr'
#> The following object is masked from 'package:cowplot':
#> 
#>     get_legend
gp_tab <- ggtexttable(unname(tab), theme = ttheme("mBlue"))
ggarrange(p, gp_tab, ncol = 2)

^{Created on 2019-01-21 by the reprex package (v0.2.1)}

You can read the vignettes of all these , there are some example about arranging plot.