ggplot2：无法将``添加到ggplot object

Question

everyone I generated 2 ggplot figures and I would like now to add them into the same figure, to do that I simply add the + . So I have 2 plots: (1 ggtree and 1 heatmap)

and I'm trying to add them in the same plot with:

ggplot<- gg_tr + gg_heat + plot_annotation(tag_levels="A")

But then I get the following issue message:

Error : Can't add `gg_heat` to a ggplot object.
Run `rlang::last_error()` to see where the error occurred.

Answer 1

library(patchwork)
gg_tr + gg_heat

Answer 2

If using ggpubr::ggarrange() , you need to put a comma and not a + .

ggarrange(histo_qmean, histo_gmean, histo_qmed, histo_gmed,
          labels = c("A", "B", "C", "D"),
          ncol = 2, nrow = 2)

I got the same error by wrongly using + , for anyone looking for it.

Answer 3

Need to add parentheses

ggplot<- gg_tr() + gg_heat() + plot_annotation(tag_levels="A")