ggplot火山图的绘制（volcano plot）

library(ggplot2)
volcano<-subset(data,select = c(Pvalue,Foldchange))
threshold<-as.factor((log2(volcano$Foldchange)>1.5|log2(volcano$Foldchange)<(-1.5))&volcano$Pvalue<0.05)
r03=ggplot(volcano,aes(log2(Foldchange),-log2(Pvalue),colour=threshold))+geom_point()
r04=r03+labs(title="Volcanoplot")+theme(plot.title = element_text(hjust = 0.5))+xlim(-10,10)
r05=r04+geom_vline(xintercept=c(-1.5,1.5),linetype="dotted",size=1)+geom_hline(yintercept=-log2(0.05),col="blue")

 

 

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火山图

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用于绘制火山图的数据矩阵（节选）

基因名	Pvalue	Foldchange
ENSG00000000003	0.868134121987662	1.2
ENSG00000000457	0.256006872721537	1.47826086956522
ENSG00000000971	0.932736306872995	0.961486486486487
ENSG00000001084	0.512134516499327	0.555555555555556
ENSG00000001167	0.175213431516265	0.291666666666667
ENSG00000001617	0.331530822974447	1.58441558441558
ENSG00000001630	0.407563817673791	0.588235294117647