用单个x轴刻度绘制3类点-R ggplot2

Question

我想想像一下序列的长度如何影响不同类别中的错误数量。

问题实际上是从文件格式开始的，但是文件的格式如下：

category count length
s 12 1500
i 13 1500
d 15 1500
s 17 1600
i 18 1600
d 22 1600
s 14 1500
i 15 1500
d 17 1500
s 30 1800
i 40 1800
d 0 1800

我如何绘制此图以使长度列为x轴，s，i，d为不同颜色或形状的点。

Answer 1

我不确定您为什么接受上述答案，因为您已明确要求ggplot2。 所以我添加ggplot解决方案以防万一

library(ggplot2)
test <- data.frame(category = factor(c("s","i","d","s","i","d","s","i","d","s","i","d")),
                   count = c(12,13,15,17,18,22,14,15,17,30,40,0),
                   length = c(1500,1500,1500,1600,1600,1600,1500,1500,1500,1800,1800,1800))

ggplot(test, aes(x = length, y = count)) + geom_point(aes(colour = category))

Answer 2

也许这可行：

xx = read.table("/tmp/tmp.txt", sep=" ", header=TRUE)
yy = split(xx[c("count", "length")], xx[["category"]])
with(yy[["d"]],
     plot(y=count, x=length,
          xlim=c(min(xx[["length"]]), max(xx[["length"]])),
          ylim=c(min(xx[["count"]]), max(xx[["count"]])),
          col="red"))
with(yy[["i"]], points(y=count, x=length, col="blue"))
with(yy[["s"]], points(y=count, x=length, col="green"))