ggplot2: Line Charts

gg_line.R

# install
install.packages('ggplot2')
install.packages('readr')

# library
library(ggplot2)
library(readr)

# import data
gdp <- readr::read_csv('https://raw.githubusercontent.com/rsquaredacademy/datasets/master/gdp.csv')
gdp

# Line Chart
ggplot(gdp, aes(year, india)) +
  geom_line()

# Line Color
ggplot(gdp, aes(year, india)) +
  geom_line(color = 'blue')

# Line Type
ggplot(gdp, aes(year, india)) +
  geom_line(linetype = 2)

# Line Type (Dashed)
ggplot(gdp, aes(year, india)) +
  geom_line(linetype = 'dashed')

# Line Size
ggplot(gdp, aes(year, india)) +
  geom_line(size = 2)

# modify data
gdp2 <- gdp %>% 
  select(year, growth, india, china) %>% 
  gather(key = country, value = gdp, -year)
gdp2

# Grouped Line Chart
ggplot(gdp2, aes(year, gdp, group = country)) +
  geom_line()

# Map Color to Country
ggplot(gdp2, aes(year, gdp, group = country)) +
  geom_line(aes(color = country))

# Map Line Type to Country
ggplot(gdp2, aes(year, gdp, group = country)) +
  geom_line(aes(linetype = country))

# Map Line Width to Country
ggplot(gdp2, aes(year, gdp, group = country)) +
  geom_line(aes(size = country))