[英]How to use “tryCatch” to skip errors in a nested loop in R?
我正在嘗試使用pageviews
使用嵌套循環加載一些數據。 你已經幫我得到了這個結果:
library("pageviews")
lang = c("it.wikipedia")
bm = c("ECB","Christine Lagarde")
x <- list(
list(),
list(),
list(),
list(),
list()
) # store results
for (i in seq_along(lang)) {
for (j in seq_along(bm)) {
x[[i]][[j]] = article_pageviews(project = lang[i], article = bm[j], platform = "all", user_type = "user", start = "2015100100", end = today(), reformat = TRUE, granularity = "daily")
}
}
然而,我需要做的最后一步是閱讀一些project
不存在的article
。 在下面找到一個例子:
lang = c("it.wikipedia")
bm = c("Philip Lane")
x = article_pageviews(project = lang, article = bm, platform = "all", user_type = "user", start = "2015100100", end = today(), reformat = TRUE, granularity = "daily")
# Error in FUN(X[[i]], ...) :
# The date(s) you used are valid, but we either do not have data for those date(s), or the project you asked for is not loaded yet. Please check https://wikimedia.org/api/rest_v1/?doc for more information.
我想將此添加到循環中。 我嘗試了一些解決方案,但如果出現錯誤,我無法讓循環跳過。 我在一個錯誤的嘗試下面發布:
lang = c("it.wikipedia")
bm = c("ECB", "Christine Lagarde", "Philip Lane")
for (i in seq_along(lang)) {
for (j in seq_along(bm)) {
skip_to_next <- FALSE
tryCatch(x[[i]][[j]] = article_pageviews(project = lang[i], article = bm[j], platform = "all", user_type = "user", start = "2015100100", end = today(), reformat = TRUE, granularity = "daily"), error = function(e) {skip_to_next <<- TRUE})
if(skip_to_next) { next }
}
}
任何人都可以幫我運行循環並在遇到錯誤時跳過嗎?
非常感謝!
您可以將tryCatch
用作:
library(pageviews)
library(purrr)
lang = c("it.wikipedia")
bm = c("ECB", "Christine Lagarde", "Philip Lane")
map_df(lang, function(x) map_df(bm, function(y)
tryCatch(article_pageviews(project = x, article = y, platform = "all", user_type = "user", start = "2015100100", end = today(), reformat = TRUE, granularity = "daily"),
error = function(e) {}))) -> result
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