如何在R中绘制多条线 [英] How to plot multiple lines in R

问题描述

我有一个看起来像这样的数据:

I have a data that looks like this:

#d  TRUE    FALSE   Cutoff
4   28198   0   0.1
4   28198   0   0.2
4   28198   0   0.3
4   28198   13  0.4
4   28251   611 0.5
4   28251   611 0.6
4   28251   611 0.7
4   28251   611 0.8
4   28251   611 0.9
4   28251   611 1
6   19630   0   0
6   19630   0   0.1
6   19630   0   0.2
6   19630   0   0.3
6   19630   0   0.4
6   19636   56  0.5
6   19636   56  0.6
6   19636   56  0.7
6   19636   56  0.8
6   19636   56  0.9
6   19636   56  1

所以我想根据True(Y轴)和False(X轴)绘制它们.

So I want to plot them based on True (Y-axis) and False (X-axis).

这是我希望它粗略显示的方式.

This is the way I want it to appear roughly.

什么是正确的方法? 我下面的代码失败

What's the right way to do it? My code below fails

dat<-read.table("mydat.txt", header=F);
dis     <- c(4,6);
linecols <-c("red","blue");
plot(dat$V2 ~ dat$V3, data = dat,  xlim = c(0,611),ylim =c(0,28251), type="l")

for (i in 1:length(dis)){
datax <- subset(dat, dat$V1==dis[i], select = c(dat$V2,dat$V3))
lines(datax,lty=1,type="l",col=linecols[i]);
}

推荐答案

由于您的数据已经是长格式，并且无论如何我都喜欢ggplot图形，因此建议您使用该路径.读入数据后(请注意TRUE和FALSE是无效名称，因此R在列名称后附加了.)，以下方法应该起作用:

Since your data is already in long format and I like ggplot graphics anyway, I'd suggest that path. After reading your data in (note that TRUE and FALSE are not valid names, so R appended a . to the column names), the following should work:

require(ggplot2)
ggplot(dat, aes(FALSE., TRUE., colour = as.factor(d), group = as.factor(d))) + 
  geom_line()

ggplot2 网站上有很多不错的提示.另请注意有关SO的搜索查询，以获得许多其他与相关主题相关的好技巧

The ggplot2 website is full of good tips. Also note this search query on SO for lots of other good tips on related topics.

记录下来，这是我修改原始代码时遇到的问题的方法:

And for the record, here's how I'd approach your problem modifying your original code:

colnames(dat)[2:3] <- c("T", "F")

dis <- unique(dat$d)

plot(NA, xlim = c(0, max(dat$F)), ylim = c(0, max(dat$T)))
for (i in seq_along(dis)){
  subdat <- subset(dat, d == dis[i])
  with(subdat, lines(F,T, col = linecols[i]))
}
legend("bottomright", legend=dis, fill=linecols)

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