仅绘制大于给定值的值:ggplot R.

时间:2016-12-22 16:12:22

标签: r plot ggplot2

在@Nick Criswell的帮助下,我学会了如何使用 ggplot2 aes_string 创建make plot函数和 lapply loop Freq plot with GGPLOT aes_string

我无法修改代码以仅绘制大于给定阈值的值。在使用函数方法之前,我编写了以下有效的代码:

p <- ggplot(subset(DAT, al.sum>10), aes(word, al.sum, y=freq)) 

问题:如何修改以下代码以仅绘制超过给定阈值的值?即如果计数大于10,我只希望每条记录都包含在频率图中。从下面的代码中只有这个条件的al.sum只有Dot_Matricks会包含在图中。

#set work DIR
setwd("C:/A")

#Data create 
DAT <- read.table(text = "ID  a1.sum  b3.sum  c6.sum  d9.sum
April_Showers   10  5   15  0
              Anita_Job   2   3   1   14
              Candy_Cain  4   7   14  17
              Crystal_Ball    6   8   16  12
              Dot_Matricks    15  9   0    1
              Kay_Largo   4   10  5   13", 
              header = TRUE, stringsAsFactors = FALSE)

 #Plot Data function  
 library(ggplot2)

 make_plots = function(data, column){
 ggplot(data, aes_string(x = "ID", y=column)) +
 geom_bar(stat="identity", fill="blue", color="green") +
 theme(plot.background = element_rect(fill = "white"),
      panel.background = element_rect(fill = "white"),        
      panel.grid.major = element_line(colour = "white",size=0.25),
      panel.grid.minor = element_blank(),
      axis.text.x=element_text(size=10,angle=90, hjust=1, 
                               face="plain", family="serif"),
      axis.text.y=element_text(size=10, hjust=1, face="plain", family="serif"), 
      axis.line.x = element_line(color="black", size = 0.50), 
      axis.line.y = element_line(color="black", size = 0.5))
}

#lapply function 
myplots <- lapply(colnames(DAT[2:ncol(DAT)]), make_plots, data = DAT)

#collect names of each col that end with .sum
n <- names(DAT[grep("*.sum",names(DAT))])

#save each plot as .png
for (i in 1:length(n)){
  print(myplots[i])
ggsave(filename=paste0(i,".png"))
}

1 个答案:

答案 0 :(得分:2)

这应该可以解决问题:

GraphSearch

您也可以使用子集功能执行此操作。如果您想将图表返回到R会话,请注释ggsave行并取消注释make_plots = function(data, column,Threshold){ PltData <- data[data[,column] >Threshold,] Plt <- ggplot(PltData, aes_string(x = "ID", y=column)) + geom_bar(stat="identity", fill="blue", color="green") + theme_bw()+ theme( panel.grid.major = element_line(colour = "white",size=0.25), panel.grid.minor = element_blank(), axis.text.x=element_text(size=10,angle=-30, hjust=0) ) # Plt ggsave(Plt,filename=paste0(column,".png")) } lapply(colnames(DAT[2:ncol(DAT)]), make_plots, data = DAT,Threshold=10)