使用多个urls进行循环和下载
使用多个urls进行循环和下载
提问于 2017-02-07 15:47:10
嗨，我指的是这个问题-- Downloading multiple files using "download.file" function in R
但我找不到我想要的答案。我想从多个urls下载数据，并使用以下代码：
我正在尝试做一些类似的事情，在R中相对较新，下面是我的代码：
temp <- tempfile(pattern = "my", fileext = ".txt") #my is a vector in YYMM form
masterfile = as.data.frame(NULL)
for(i in 1:length(my)) {
download.file(url = paste0("http://www2.census.gov/econ/bps/Metro/ma", "my[i]", "c.txt"), destfile = paste0("/Users/shashankrai/GitHub/data-science/homeworks/homework1/","my[i]","c.txt"), mode = wb)
temp <- read.table(paste0("/Users/shashankrai/GitHub/data-science/homeworks/homework1/","my[i]","c.txt"), sep = ",", skip = 3)[, c(1,3,5)]
masterfile <- rbind(masterfile, temp)
}它抛出以下错误：
卷曲：(3)第44栏中的球状差范围 文件中的错误(文件，"rt")：无法打开连接 此外:警告信息： 1:在download.file(url = paste0("http://www2.census.gov/econ/bps/Metro/ma“)，：download具有非零退出状态) 2:在文件(文件，"rt")中:无法打开文件'/Users/shashankrai/GitHub/data-science/homeworks/homework1/myic.txt'：没有这样的文件或目录
你能告诉我我做错了什么吗？
我也尝试过这样做：
temp <- tempfile(pattern = "my", fileext = ".txt")
masterfile = as.data.frame(NULL)
for(i in 1:length(my)) {
download.file(url = paste0("url", "my[i]", "c.txt"), destfile = my[i], mode = wb)
temp <- read.table(my[i], sep = ",", skip = 3)[, c(1,3,5)]
masterfile <- rbind(masterfile, temp)
}回答 1
Stack Overflow用户
发布于 2017-02-07 16:06:14
不要紧。弄明白了。这是一个最终起作用的代码：
masterfile = as.data.frame(NULL)
for(i in 1:length(my)) {
temp <- tempfile(pattern = "my", fileext = ".txt")
download.file(url = paste0("http://www2.census.gov/econ/bps/Metro/ma", my[i], "c.txt"), destfile = temp[i], mode = wb)
masterfile <- rbind(masterfile, read.table(file = temp[i], sep = ",", skip = 3)[, c(1,3,5)])
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/42094106
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