R语言下面这个ifelse 里面的data$AnalyClass.x，和data$AnalyClass.y 表示什么？ 数据data的AnalyClass列的什么操作。 只会python 这个R 读不太懂data$class<-ifelse(!is.na(data$AnalyClass.x),data$AnalyClass.x,data$AnalyClass.y)configP<- read.csv(".\\02Config\\ParameterTag.csv",header=T, sep=",")configS<- read.csv(".\\02Config\\ParameterStepTag.csv",header=T, sep=",")for (i in 1:length(dir_b) ){ data = read.csv(file = dir_b[i], header=T, sep=",") data$filename<- b[i] data<- merge(data,configP[,c("Parameter","AnalyClass")],by.x="Parameter", by.y = "Parameter", all.x=T) data<- merge(data,configS[,c("Parameter","Step","AnalyClass")],by.x=c("Parameter","Step"), by.y=c("Parameter","Step"), all.x=T) data$class<-ifelse(!is.na(data$AnalyClass.x),data$AnalyClass.x,data$AnalyClass.y)