Question

Hello I am attempting to create a single dataframe with multiple .csv files from a folder that will be updating/added to.

I have found previous answers on here however I am having a rather simple error

Error in read.table(file = file, header = header, sep = sep, quote = quote, : 'file' must be a character string or connection

dir<-"asdfasdfasdfasf/asdfasdfs" #change this to your directory

temp <- list.files(pattern="*.csv")
importDM<-lapply(temp, read.csv)

rawDM<-read.csv(importDM, header = TRUE)      #will read csv

Please let me know what I am doing wrong!

Cheers,

Answer 1

从我在list.files函数的调用中看到的，您应该添加path参数并指定＆＃34; dir＆＃34;它。变量importDM是一个列表，因为你已经在lapply中调用了read.csv，所以不需要rawDM变量。如果文件具有相同的数据结构，则可以使用as.data.frame将importDM转换为数据框。如果列表元素不遵循相同的结构，那么它就会更加有效。

这是三个csv文件的工作示例。

    dir <-"./data" #change this to your directory
    temp <- list.files(pattern="*.csv", path = dir, full.names = TRUE)
    importDM<-lapply(temp, read.csv, header = FALSE)
    df <- as.data.frame(importDM)

每个csv文件包含三个数字（1,2,3 - 4,5,6 - 7,8,9）

Answer 2

试试这个：

temp <- list.files(pattern="*.csv")

dataset <- do.call(rbind,lapply(temp,
read.csv,header=TRUE))

Answer 3

这应该这样做 -

dir<-"asdfasdfasdfasf/asdfasdfs" #change this to your directory
temp <- list.files(pattern="*.csv")
importDM<-lapply(temp, read.csv)
rawDM <- do.call(rbind, lapply(raw, read.csv, header = TRUE))

Updating/multiple .csv files into single dataframe

3 个答案: