ggarrange fails if eiter ncol = 1 or nrow = 1

[GegznaV]

In the example below ggarrange fails to create a single plot if eiter ncol = 1 or nrow = 1:

library(ggplot2)

fig_1 <- 
  ggplot(iris, aes(x = Sepal.Length, y = Sepal.Width)) +
  geom_line()

ggpubr::ggarrange(fig_1, fig_1, ncol = 1)
ggpubr::ggarrange(fig_1, fig_1, nrow = 1)

I by specifying ncol = 1 I expected all plots on one page arranged in one column. But the result is two separate plots and the output in the console:

$`1`

$`2`

attr(,"class")
[1] "list"      "ggarrange"

This should either be fixed (preferred), or a meaningful warning message should appear with explanations what happened, or, if the behavior I described is expected, more information should be included in the documentation.

In the situation:

ggpubr::ggarrange(fig_1, fig_1, nrow = 0)

A meaningful error message that nrow must be > 0 would also be preffered instead of Error in 1:(rows * cols) : NA/NaN argument.

[ashenkin]

+1, except that it's not just a matter of ncol/nrow = 1. This happens when only ncol or only nrow is specified. i.e.,
ggpubr::ggarrange(fig_1, fig_1, fig_1, ncol = 2)
fails as well.

[kassambara]

In the current version:

• If you want to arrange 2 , 3, ..., or n plots by rows only, you need to specify nrow = n, where n is the number of plots
• Similarly, if you want to arrange 2 , 3, ..., or n plots by columns only, you need to specify ncol = n

In your example, the following R code should work:

# Arrange two plots in two successive columns
ggpubr::ggarrange(fig_1, fig_1, ncol = 2)

# Arrange two plots in two successive rows
ggpubr::ggarrange(fig_1, fig_1, nrow = 2)

I will update ggarrange(), so that it can automatically guess the correct layout for the options ncol=1 and nrow=1

[kassambara]

fixed now thanks

[mielk132]

I had the same error as GegznaV ( running ‘4.1.3’ in Rstudio), but it worked when I supplied 1.5. It would not show in Rstudio's viewing window when I set nrow =2 & ncol =1. It worked when printed to pdf.

ggarrange(p,p2, labels = c("A","B"),combine.legend = TRUE, legend = "right", ncol = 2, nrow= 1.5)