R中的频率分布 [英] Frequency distribution in R

问题描述

我有五列数字.我想在一张图表中用R中的不同颜色绘制五列的频率分布.有人可以帮我举例说明一下.我是R的新手.

I have five columns with numbers. I want to plot the frequency distribution of five columns in one graph with different colors in R. Can some one help me out how i can do this with an example. I am very new to R.

推荐答案

使用来自@eddi的示例数据，您还可以考虑使用"lattice"软件包:

Using the sample data from @eddi, you can also consider the "lattice" package:

set.seed(1)
d <- data.frame(a = rnorm(100), b = rnorm(100, 1), c = rnorm(100, 2),
                d = rnorm(100, 3), e = rnorm(100, 4))

library(lattice)

densityplot(~ a + b + c + d + e, data = d)

这将产生:

如果列数很多，也可以通过先创建formula来创建图形:

If you have many columns, you can also create your plot by first creating a formula:

myFormula <- as.formula(paste("~ ", paste(names(d), collapse = "+"))) 
densityplot(myFormula, data = d)

您还应该探索densityplot可用的各种选项，例如plot.points(如果您不希望将点放在密度图的底部，可以将其设置为FALSE)和auto.key添加图例.

You should also explore the various options available for densityplot, such as plot.points (which can be set to FALSE if you don't want the points at the bottom of the density plots) and auto.key to add a legend.

另一个明显的选择是使用"ggplot2"，但是为此，您需要首先将数据转换为长"格式:

Another obvious option is to use "ggplot2", but for this, you need to first convert your data into a "long" format:

d2 <- stack(d)
library(ggplot2)
qplot(values, colour=factor(ind), data=d2, geom="density")

结果:

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