如何修复“输入中无可用行"的 R 错误? [英] How to fix the error in R of "no lines available in input"?

问题描述

我需要做的是从数百个链接中读取数据，其中一些链接不包含数据，因此，如下代码:

What I need to do is to read data from hundreds of links, and among them some of the links contains no data, therefore, as the codes here:

urls <-paste0("http://somelink.php?station=",station, "&start=", Year, "01-01&etc")
myData <- lapply(urls, read.table, header = TRUE, sep = '|')

弹出一个错误，说输入中没有可用的行"，我试过使用try"，但出现同样的错误，请帮忙，谢谢.

an error pops up saying "no lines available in input", I've tried using "try", but with same error, please help, thanks.

推荐答案

这里有 2 个可能的解决方案(未经测试，因为您的示例不可重现):

Here are 2 possible solutions (untested because your example is not reproducible):

使用try:

myData <- lapply(urls, function(x) {
  tmp <- try(read.table(x, header = TRUE, sep = '|'))
  if (!inherits(tmp, 'try-error')) tmp
})

使用tryCatch:

myData <- lapply(urls, function(x) {
  tryCatch(read.table(x, header = TRUE, sep = '|'), error=function(e) NULL)
})

这篇关于如何修复“输入中无可用行"的 R 错误?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！