Data Visualization: Line Graphs

viz_line.R

# data
head(AirPassengers)

# plot
data <- head(AirPassengers)
plot(data, type = 'l')
plot(data, type = 'b')
plot(data, type = 'o')
plot(data, type = 'c')

# color
plot(data, type = 'l', col = 'blue')
plot(data, type = 'b', col = 'blue')

# line type
plot(data, type = 'l', lty = 3)
plot(data, type = 'l', lty = 'dashed')

# line width
plot(data, type = 'l', lwd = 2.5)

# enhance points
plot(data, type = 'b', pch = 23, col = 'red', cex = 1.5)

# different color for line and points
plot(data, type = 'l', col = 'red')
points(data, pch = 23, col = 'blue', bg = 'green', cex = 1.5)

# additional lines
data1 <- c(7.2, 7.6, 6.8, 6.5, 7)
data2 <- c(6.8, 7.2, 7.8, 7, 6.2)
plot(data1, type = "b", col = "blue")
lines(data2, type = "b", col = "red")

# modify axis range
plot(data1, type = "b", col = "blue", ylim = c(5, 9))
lines(data2, type = "b", col = "red")

# putting it all together
plot(data1, type = "b", col = "blue", 
     ylim = c(5, 9), main = 'Line Graph',
     xlab = 'Index', ylab = 'Data')
lines(data2, type = "b", col = "red")