[英]How do I add column from an original dataframe to scraped data?
我有兩列“名稱”和“鏈接”,表示公司名稱和要從中抓取的鏈接。 我如何放回名稱列,以便每行抓取的數據都有一個包含相應公司名稱的列?
List.Of.Tabs <- map(pages, ~ {
name <- .x[1]
link <- .x[2]
webpage <- read_html(link)
tbls <- html_nodes(webpage, "table")
tbls_ls <- html_table(tbls,fill = TRUE)
pos1 <- possibly(function(tbls) bind_rows(tbls) %>%
filter_all(any_vars(. %in% c("Ireland", "Japan")))
, otherwise = NA)
pos1(tbls_ls)
結果應該是這樣的:
results <- data.frame(subsidiaries = c('Microsoft Japan','Microsoft Ireland'),
country = c('Japan', 'Ireland'),
name = c('Microsoft','Microsoft'))
根據代碼,我們可能需要mutate
(即從第一行代碼中已經創建的“名稱”創建一個“名稱”列)
List.Of.Tabs <- map(pages, ~ {
name <- .x[1]
link <- .x[2]
webpage <- read_html(link)
tbls <- html_nodes(webpage, "table")
tbls_ls <- html_table(tbls,fill = TRUE)
pos1 <- possibly(function(tbls) bind_rows(tbls) %>%
filter_all(any_vars(. %in% c("Ireland", "Japan"))) %>%
mutate(name = name) # changed here
, otherwise = NA)
pos1(tbls_ls)
})
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