Question

我正在尝试自动（在Win7系统上）一个R脚本从Bloomberg读取数据并将其写入文件，以供另一个系统处理。我的代码完全在R gui中运行。所以我写了一个批处理文件来调用这个.r文件并将结果输出到script.out，如下所示。当我双击批处理文件时，一切都成功运行。当我安排任务运行批处理文件时，R代码运行，从Bloomberg收集数据，但写入文件每次都失败。

R代码

library(quantmod)
library(rJava)
library(Rbbg)

#Bloomberg connectivity
conn <- blpConnect()

#Initialize Java Virtual MAchine
.jinit(classpath="myClasses.jar", parameters="-Xmx512m")

setwd("C:/Users/abg/Skydrive/Documents/Bloomberg Historical Data 2013-07-30/data")
output_dir <- "W:/abg/Daily Forward Rates/"


results_df<- data.frame(Currency=character(), Spot=character(), sp_bid=numeric(), sp_ask=numeric(), 
                                TN=character(), tn_bid=numeric(), tn_ask=numeric(), 
                                SN=character(), sn_bid=numeric(), sn_ask=numeric(),stringsAsFactors=FALSE)



for(i in 1:length(list.files(pattern='*\\.csv')))
{
    currency <- substr(list.files(pattern='*\\.csv')[i],1,6)
    securities <- c(paste(currency, " Curncy", sep="")) 
    fields <- c("BID", "ASK", "TIME")
    bb_results<-bdp(conn, securities, fields)
    print(bb_results)

    results_df[i,1]<-currency
    results_df[i,2]<- "SPOT"
    results_df[i,3]<- bb_results$BID
    results_df[i,4]<- bb_results$ASK

}


results_df[is.na(results_df)]<-""

write.table(results_df, file = paste(output_dir, Sys.Date(), "_forward_rates.csv", sep=""), sep = ",", append=FALSE, row.names = FALSE, col.names=TRUE)

批处理文件代码：

"C:\Program Files\R\R-3.0.1\bin\x64\R.exe" CMD BATCH --vanilla --slave "C:\Users\abg\SkyDrive\Documents\tom next rates from bloomberg.R" "C:\Users\abg\SkyDrive\Documents\script.out"

最后，这是script.out文件末尾的语句，似乎表明write.table命令失败。

Error in file(file, ifelse(append, "a", "w")) : 
  cannot open the connection
Calls: write.table -> file
In addition: Warning message:
In file(file, ifelse(append, "a", "w")) :
  cannot open file 'W:/abg/Daily Forward Rates/2013-10-01_forward_rates.csv': No such file or directory
Execution halted

我尝试将文件写入本地驱动器而不是网络驱动器，结果相同。

任何建议都将不胜感激。

Answer 1

尝试以下操作而不是write.table命令

f.nm <- paste0(output_dir, Sys.Date(), "_forward_rates.csv")

# break it down into finer steps
file.create(f.nm)
f <- file(f.nm, open="w") # or open="a" if appending

write.table(results_df, file = f, sep = ",", append=FALSE, row.names = FALSE, col.names=TRUE)

close(f)

如果失败，您至少可以查看是否正在创建文件。如果不是，那么您知道问题更可能是由于操作系统连接或权限问题而导致的

R，命令行，写入文件失败

1 个答案: