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这篇文章给大家分享的是有关如何利用ggplot2绘制密度图的内容。小编觉得挺实用的,因此分享给大家做个参考,一起跟随小编过来看看吧。
利用ggplot2绘制密度图,并直接在密度图上叠加另一组数据的密度曲线
library('ggplot2')library('reshape2')A =rep( c("A","B","C","D"),each=2) B = c(6.332968,9.368328,6.674348,4.127901,5.192845,6.652865,7.829350,6.995062) C = c(5.367671,7.286253,5.217053,3.875520,6.679444,6.127819,5.091166,7.942029) D = c(5.171107,6.232718,5.320568,4.924498,7.140883,4.228142,5.793514,6.347785) E = c(5.533754,6.152393,6.113618,4.960935,5.959568,5.078903,4.871103,5.223206) F = rep(c("sample1","sample2"),len=4) dat = data.frame(A,B,C,D,E) names(dat)[1] = c("type") names(dat)[2:5]=F dat = melt(dat,variable.name="Sample",value.name = "Num") head(dat)
密度图
P_density=ggplot(dat,aes(x=Num))+ geom_density(aes(fill=as.character(dat$Sample),color=as.character(dat$Sample)),alpha = 0.5,size=1,linetype="solid")+ theme(plot.title = element_text(size = 25,face = "bold", vjust = 0.5, hjust = 0.5), legend.title = element_blank(), legend.text = element_text(size = 15, face = "bold"), legend.position = 'right', legend.key.size=unit(0.5,'cm'), axis.line=element_line(size = 1,color="black"), axis.ticks.x=element_blank(), axis.text.x=element_text(size = 15,face = "bold", vjust = 0.5, hjust = 0.5), axis.text.y=element_text(size = 15,face = "bold", vjust = 0.5, hjust = 0.5), axis.title.x = element_text(size = 20,face = "bold", vjust = 0.5, hjust = 0.5), axis.title.y = element_text(size = 20,face = "bold", vjust = 0.5, hjust = 0.5), panel.background = element_rect(fill = "transparent",colour = NA), panel.grid.minor = element_blank(), panel.grid.major = element_blank(), plot.background = element_rect(fill = "transparent",colour = NA)) print(P_density)
两组数据直接叠加密度图
数据dat1
A =rep( c("A","B","C","D"),each=2) B = c(6.332968,9.368328,6.674348,4.127901,5.192845,6.652865,7.829350,6.995062) C = c(5.367671,7.286253,5.217053,3.875520,6.679444,6.127819,5.091166,7.942029) D = c(5.171107,6.232718,5.320568,4.924498,7.140883,4.228142,5.793514,6.347785) E = c(5.533754,6.152393,6.113618,4.960935,5.959568,5.078903,4.871103,5.223206) F = rep(c("sample1","sample2"),len=4) dat1 = data.frame(A,B,C,D,E) names(dat1)[1] = c("type") names(dat1)[2:5]=F dat1= melt(dat1,variable.name="Sample",value.name = "Num") head(dat1)
数据dat2
A =rep( c("A","B","C","D"),each=2) B = c(9.944277,9.245216,8.741771,8.573114,7.953372,10.756460,7.904934,8.971346) C = c(8.248881,9.238328,9.789772,9.800562,8.698050,9.083611,9.076143,9.650690) D = c(9.884433,9.863561,10.756525,9.520756,8.363614,9.184047,10.004748,9.019348) E = c(9.821923,9.430095,9.431069,8.589512,7.755056,9.935671,7.219894,9.492607) F = rep(c("sample3","sample4"),len=4) dat2 = data.frame(A,B,C,D,E) names(dat2)[1] = c("type") names(dat2)[2:5]=F dat2 = melt(dat2,variable.name="Sample",value.name = "Num") head(dat2)
绘图
P_density=ggplot(data=NULL)+ geom_density(aes(x=dat1$Num,fill=as.character(dat1$Sample),color=as.character(dat1$Sample)),alpha = 0.3,size=1,linetype="solid")+ geom_density(aes(x=dat2$Num,fill=as.character(dat2$Sample),color=as.character(dat2$Sample)),alpha = 0.3,size=1,linetype="solid")+ labs(x="Num")+ theme(plot.title = element_text(size = 25,face = "bold", vjust = 0.5, hjust = 0.5), legend.title = element_blank(), legend.text = element_text(size = 15, face = "bold"), legend.position = 'right', legend.key.size=unit(0.5,'cm'), axis.line=element_line(size = 1,color="black"), axis.ticks.x=element_blank(), axis.text.x=element_text(size = 15,face = "bold", vjust = 0.5, hjust = 0.5), axis.text.y=element_text(size = 15,face = "bold", vjust = 0.5, hjust = 0.5), axis.title.x = element_text(size = 20,face = "bold", vjust = 0.5, hjust = 0.5), axis.title.y = element_text(size = 20,face = "bold", vjust = 0.5, hjust = 0.5), panel.background = element_rect(fill = "transparent",colour = NA), panel.grid.minor = element_blank(), panel.grid.major = element_blank(), plot.background = element_rect(fill = "transparent",colour = NA)) print(P_density)
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