Dealing with Islands with sf objects and the tmap package [closed]

Question

I have the bounderies for the municipalities in the "capital region" of Denmark. The acctual map looks like this:

The yellow island is the fourth row in my sf object.

I am trying to folllow the example at the end of section 8.2.7 in this book (link). That is I need to make the yellow island smaller and move it closer to the rest. Also there seems not to be any tags for tmap, but that is the package the link uses.

I have tried this code:

RH <- geo %>%
  filter(REGIONKODE=="1084") %>% 
  select(KOMNAVN, AREAL)  %>% 
  filter(!(KOMNAVN  %in% c("Christiansø", "Bornholm"))) %>% 
  arrange(KOMNAVN)


Bornholm <- geo %>% 
  filter(KOMNAVN=="Bornholm")

mainland <-  tm_shape(RH, projection = 2163) + tm_polygons() + 
  tm_layout(frame = FALSE)  

Bornholm_map   <-  tm_shape(Bornholm) + tm_polygons() + 
  tm_layout(title = "Bornholm", frame = FALSE, bg.color = NA, 
            title.position = c("LEFT", "BOTTOM"))
mainland 
print(Bornholm_map, vp = viewport(x = 0.35, y = 0.1, width = 0.2, height = 0.1))

This just rotates the plot with 90 dergrees and the island gets lost and I get this error message

Error in viewport(x = 0.35, y = 0.1, width = 0.2, height = 0.1) : 
  could not find function "viewport"

Answer 1

If you search for the word "viewport" in that text you'll see this:

Finally, we combine the two maps. A viewport from the grid package can be used by stating a center location (x and y) and a size (width and height) of the inset map.

library(grid)

So do library(grid) to bring in the viewport function.