R语言的文件读取小技能

使用R软件,解锁数据读取新姿势。
【R语言的文件读取小技能】1.批量读取文件夹里面某类文件
library(data.table)file_names<- list.files(pattern = ".csv") for (i in 1:length(file_names)) { name<-gsub(".csv","",file_names[i]) assign(name,fread(file_names[i]) }

2.批量将文件夹某类文件读取进来并合并成一个数据框,要求数据规整
file <- list.files(pattern = ".csv")#正则表达式匹配文件后缀 names(file) <- files data <- lapply(file, fread) data0 <- do.call(rbind,data)

3.批量读取Excel中多个Sheet工作表合并到一个数据框里,同样要求数据规整。
install.packages("openxlsx") library(openxlsx) aa <-NA pb <- txtProgressBar(min = 0, max =2, style = 3) for (i in 1:2){ mydata<-read.xlsx("###.xlsx", sheet = i, startRow = 1, colNames = T, rowNames = FALSE, detectDates = FALSE, skipEmptyRows = TRUE, skipEmptyCols = TRUE, rows = NULL, cols = NULL, check.names = FALSE, namedRegion = NULL, na.strings = "NA", fillMergedCells = FALSE) aa <- rbind(aa,mydata) setTxtProgressBar(pb,i) }

4.批量写出全局环境中的数据
for (i in 1:length(ls())) {write.csv(eval(parse(text = ls(pattern = " ")[i])), paste0(),na="",row.names=F)# paste0()定义文件名 }

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