从 R 中的数据框中绘制多条线 [英] Plotting multiple lines from a data frame in R

问题描述

我正在构建一个 R 函数来绘制数据表中的几行，我不明白为什么这不起作用?

I am building an R function to plot a few lines from a data table, I don't understand why this is not working?

data = read.table(path, header=TRUE);
plot(data$noop);
lines(data$noop, col="blue");
lines(data$plus, col="green");

我正在从我拥有的文件中读取数据，该文件的格式如下:

I am reading the data from a file I has which is formatted like this:

 noop         plus         mins
 33.3         33.3         33.3
 30.0         40.0         30.0
 25.0         50.0         25.0

这是数据集的最小表示，其中包含更多标题和更多数据点.所以这个数据集的每一行都反映了在给定时间采集的样本.所以我的目标是从文件中读取这些数据，然后将每一列绘制为一系列由不同颜色的线连接的点.

This is the minimal representation of the dataset, which contains more headers and more data points. So each of the rows of this data set reflects a sample taken at a given time. So my objective is to read this data in from the file, and then plot each column as a series of points connected by lines of different color.

我目前使用的方法只是绘制 1 条线，而不是多条线.

The approach I am using currently is only plotting 1 line, and not multiple lines.

推荐答案

查看 ggplot2 包

Have a look at the ggplot2 package

library(ggplot2)
library(reshape)
data <- data.frame(time = seq(0, 23), noob = rnorm(24), plus = runif(24), extra = rpois(24, lambda = 1))
Molten <- melt(data, id.vars = "time")
ggplot(Molten, aes(x = time, y = value, colour = variable)) + geom_line()

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