R中具有因子变量的线图 [英] Line plot with factor variables in R

问题描述

如何让 R 根据因子变量在两个观察值之间画线?

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

我有两个时间"点，早和晚，编码为分类

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"
)

我只得到一种条形图:

plot(plotdata)

我也尝试将变量编码为 0 和 1，但随后我得到了一个连续的轴.

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

推荐答案

假设你的数据是

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

带基数 R

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

使用 ggplot2

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

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