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Contents

1/10

Grammar of Graphics

drawing

2/10

Grammar of Graphics

drawing

  • Data: Input data
  • Geom: A geometry representing data. Points, Lines etc
  • Aesthetics: Visual characteristics of the geometry. Size, Color, Shape etc
  • Scale: How visual characteristics are converted to display values
  • Statistics: Statistical transformations. Counts, Means etc
  • Coordinates: Numeric system to determine position of geometry. Cartesian, Polar etc
  • Facets: Split data into subsets
2/10

Building a graph

drawing

3/10

Build-Demo

ggplot(iris)

4/10

Build-Demo

ggplot(iris,aes(x=Sepal.Length,
                y=Sepal.Width))

5/10

Build-Demo

ggplot(iris,aes(x=Sepal.Length,
                y=Sepal.Width))+
  geom_point()

6/10

Build-Demo

ggplot(iris,aes(x=Sepal.Length,
                y=Sepal.Width,
                colour=Species))+
  geom_point()

7/10

Geoms

drawing

8/10

Geoms

drawing

p <- ggplot(iris)
# scatterplot
p+geom_point(aes(x=Sepal.Length,y=Sepal.Width))
# barplot
p+geom_bar(aes(x=Sepal.Length))
# boxplot
p+geom_boxplot(aes(x=Species,y=Sepal.Width))
# search
help.search("^geom_",package="ggplot2")
8/10

Aesthetics

  • Aesthetic mapping vs aesthetic parameter
ggplot(iris)+
  geom_point(aes(x=Sepal.Length,
                 y=Sepal.Width,
                 size=Petal.Length,
                 alpha=Petal.Width,
                 shape=Species,
                 color=Species))

9/10

Aesthetics

  • Aesthetic mapping vs aesthetic parameter
ggplot(iris)+
  geom_point(aes(x=Sepal.Length,
                 y=Sepal.Width,
                 size=Petal.Length,
                 alpha=Petal.Width,
                 shape=Species,
                 color=Species))

ggplot(iris)+
  geom_point(aes(x=Sepal.Length,
                 y=Sepal.Width),
                 size=2,
                 alpha=0.8,
                 shape=15,
                 color="steelblue")

9/10

Multiple geoms

ggplot(iris,aes(x=Sepal.Length,y=Sepal.Width))+
      geom_point()+
      geom_line()+
      geom_smooth()+
      geom_rug()+
      geom_step()+
      geom_text(data=subset(iris,iris$Species=="setosa"),aes(label=Species))

10/10

Thank you. Questions?

R version 4.1.3 (2022-03-10)

Platform: x86_64-pc-linux-gnu (64-bit)

OS: Ubuntu 22.04.3 LTS


Built on : 02-Feb-2024 at 11:06:13

2024 • SciLifeLab • NBIS

10/10

Grammar of Graphics

drawing

2/10
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