CODEWITHSUNDEEP
rplot
MERose
MERose

Reputation: 4421

Line plot with factor variables in R

How can I make R draw lines between two observations according with factor variables?

I have two 'time' points, early and late, coded as categorical

plotdata <- structure(list(
               x = structure(1:2, .Label = c("early", "late"), class = "factor"), 
               y = 1:2
               ),
            .Names = c("x", "y"), row.names = c(NA, -2L), class = "data.frame"
)

I only get kind of a bar plot:

plot(plotdata)

I also tried coding the variables as 0 and 1, but then I get a continuous axis with.

Upvotes: 1

Views: 8355

Answers (1)

konvas
konvas

Reputation: 14346

Let's say your data is 

d <- structure(list(x = structure(1:2, .Label = c("early", "late"), class = "factor"), 
    y = 1:2), .Names = c("x", "y"), row.names = c(NA, -2L), class = "data.frame")
d
#       x y
#   early 1
#    late 2

With base R

plot(as.numeric(d$x), d$y, type = "l", xaxt = "n")
axis(1, labels = as.character(d$x), at = as.numeric(d$x))

With ggplot2

library(ggplot2)
ggplot(d, aes(x = x, y = y)) + geom_line(aes(group = 1))

Upvotes: 6

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