我編寫了以下函數來組合300個.csv文件。我的目錄名稱是“ specdata”。我已經完成了以下執行步驟，x <- function(directory) { dir <- directory data_dir <- paste(getwd(),dir,sep = "/") files <- list.files(data_dir,pattern = '\\.csv') tables <- lapply(paste(data_dir,files,sep = "/"), read.csv, header = TRUE) pollutantmean <- do.call(rbind , tables) }# Step 2: call the functionx("specdata")# Step 3: inspect resultshead(pollutantmean)Error in head(pollutantmean) : object 'pollutantmean' not found我怎么了 誰能解釋一下？
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梵蒂岡之花
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```{r echo = FALSE, warning = FALSE, message = FALSE}
setwd("~/Data/R/BacklogReporting/data/PastDue/global/") ## where file are located
path = "~/Data/R/BacklogReporting/data/PastDue/global/"
out.file <- ""
file.names <- dir(path, pattern = ".csv")
for(i in 1:length(file.names)){
file <- read.csv(file.names[i], header = TRUE, stringsAsFactors = FALSE)
out.file <- rbind(out.file, file)
}
write.csv(out.file, file = "~/Data/R/BacklogReporting/data/PastDue/global/global_stacked/past_due_global_stacked.csv", row.names = FALSE) ## directory to write stacked file to
past_due_global_stacked <- read.csv("C:/Users/E550143/Documents/Data/R/BacklogReporting/data/PastDue/global/global_stacked/past_due_global_stacked.csv", stringsAsFactors = FALSE)
files <- list.files(pattern = "\\.csv$") %>% t() %>% paste(collapse = ", ")
```
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