[R] Mapping 2D to 3D

[Abby Spurdle]

> I was looking at this example which uses geom_contour():
>
> ggvolcano = volcano %>%
>  reshape2::melt() %>%
>  ggplot() +
>  geom_tile(aes(x=Var1,y=Var2,fill=value)) +
>  geom_contour(aes(x=Var1,y=Var2,z=value),color="black") +
>  scale_x_continuous("X",expand = c(0,0)) +
>  scale_y_continuous("Y",expand = c(0,0)) +
>  scale_fill_gradientn("Z",colours = terrain.colors(10)) +
>  coord_fixed()
> print(ggvolcano)

Yesturday, I watched the movie Tenet.

WARNING: SPOILER ALERT

Everything's going forwards and backwards at the same time.
This code reminds me of that movie.