ggplot不添加图例。我错过了什么？ R很新 [英] ggplot not adding legend. What am I missing? very new to R

问题描述

我正在用ggplot绘制三个样本，但没有为样本添加图例。这不是吐出任何错误信息，所以我不知道我要去哪里错了。我真的想知道一些指导。

I'm plotting three samples with ggplot but it's not adding a legend for the samples. It's not spitting out any error message so I'm not sure where I'm going wrong. I'd really appreicate some guidance.

我试图手动为图例声明每个样本的颜色，但图中仍然没有图例。

I've tried to declare color for each sample for the legend manually but there is still no legend on the plot.

df<-data.frame(samples$V1, samples$V2, samples$V3, samples$V4, samples$V5, samples$V6, samples$V7)


CG_methplot <- ggplot(df, aes(x=samples$V1,))+
  scale_x_continuous(breaks=number_ticks(10))+
  xlab("bins")+
  ylab("mean CG methylation")+
  geom_point(aes(y=samples$V2), size=3, colour='#009933')+
  geom_point(aes(y=samples$V3), size=3, colour='#FF0000')+
  geom_point(aes(y=samples$V4), size=3, colour='#0033FF')+
  scale_color_manual(values=c("samples1"="009933", "sample2"="FF0000", "sample3" ="0033FF"))
CG_methplot

根据要求提供样品数据。

As requested, sample data.

头（df）

head(df)

samples.V1 samples.V2 samples.V3 samples.V4 samples.V5 samples.V6 samples.V7
1          1   0.033636   0.027857   0.028830   0.029836   0.024457   0.024930
2          2   0.032094   0.029620   0.028005   0.028294   0.026220   0.024105
3          3   0.032011   0.027212   0.029728   0.028211   0.023812   0.025828
4          4   0.030857   0.029833   0.028907   0.027057   0.026433   0.025007
5          5   0.028480   0.028080   0.028553   0.024680   0.024680   0.024653
6          6   0.029445   0.027099   0.029346   0.025645   0.023699   0.025446

推荐答案

library(reshape2)
melted <- melt(df, id.vars = "V1")

p <- ggplot(melted, aes(x = V1, y = value, colour = variable))
p + geom_point()

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