An R package for graphics

• part of the tidyverse

• developped by Hadley Wickham

2 principles

• a graph is made of several layers

• grammar (i.e. mathematical & esthetical rules) between layers

[source: ggplot2 website]

1. initialize the data

2. add (at least) one geometry — with +

3. specify required Aesthetics — with aes()

• x
• y
• colour
• fill
• size
• alpha
• linetype
• labels
• shape

37 different geometries…

• geom_point
• geom_line
• geom_tile
• geom_bar
• …

Chosing colors is hard ! (as hard as naming things ?)

Be mindful of:

• black and white

• colorblinds (~10% of white men)

➡️ viridis 🌐

➡️ MetBrewer 🌐

stop wasting time

Open BADAS4_practical.html and follow along…

• Rstudio cheatsheet

• ggplot2 website

• R Graphics Cookbook by W Chang

• Google, Stack-overflow, GitHub, …