R语言for循环批量生成变量，并且赋值

rm(list=ls())
data <- read.table("MS_identified_information.txt",header = T,sep = "t",quote="",na.strings = "",row.names = 1,comment.char = "")
name1 <- paste("H1299",sep = "_",c(1:3))
name2 <- paste("Metf",sep = "_",c(1:3))
name3 <- paste("OEMetf",sep = "_",c(1:3))
name <- data.frame(name1,name2,name3)
mean.data=data.frame(row.names(data))

for (i in 1:3){
  tmp <- subset(data,select = as.vector.factor(name[,i])) #筛选特定的样本
  mean_ <- as.data.frame(apply(tmp, 1, mean)) #行求平均值
  //assign()功能就是对变量进行赋值如i=1时，df1=mean_
  //把三次结果组合起来
  mean.data <- cbind.data.frame(mean.data,assign(paste("df", i, sep=""), mean_))
  //这里没有体现出变量，实际上生成了df1,df2,df3结果
}
colnames(mean.data) <- c("ID","H1299","Metf","OEMetf")
write.table(mean.data,file="MS_mean.xls",row.names = FALSE,sep = "t",na="")