1. Pie Chart in R

2. Enter the data vectors. This data is the percentages by weight of elements in the human body
symbols = c("O", "C", "H", "N", "Ca", "P", "K", "S", "Na", "Cl", "Mg")
names = c("Oxygen", "Carbon", "Hydrogen", "Nitrogen", "Calcium", "Phosphorus",
"Potassium", "Sulfur", "Sodium", "Chlorine", "Magnesium")
number = c(8, 6, 1, 7, 20, 15, 19, 16, 11, 17, 12)
percents = c(65, 18.5, 9.5, 3.3, 1.5, 1.0, 0.4, 0.3, 0.2, 0.2, 0.1)

3. Make a pie chart

4. Try a legend instead

5. Not sure students will be able to do this, but let’s try: Click on Packages, then Install

6. Type in plotrix and click Install

7. Now shows up in list

8. 3D pie chart fro plotrix

9. With legend

10. Ggplot2 Ggplot2 is a very extensive library for R
After we see how installing the simpler plotrix library goes, we may use ggplot2