[英]How to check if a CRAN mirror is outdated?
R users are advised to download R and R packages from local CRAN mirrors. 建议R用户从本地CRAN镜像下载R和R包。 But some are outdated.
但有些已经过时了。 Is there an easy way to check if a repository is outdated?
有没有一种简单的方法来检查存储库是否已过时? Any function in R that does that?
R中的任何功能都可以吗?
One way is to look at $CRANMIRROR/src/contrib and sort by date (by clicking twice on date) so that you can compare the most recent package on the mirror on what the master host carries. 一种方法是查看$ CRANMIRROR / src / contrib并按日期排序(通过在日期单击两次),以便您可以比较镜像上最新的主程序包所包含的内容。
Beyond that, you could use R itself and point available.packages()
at the master as well as at a mirror -- if the result sets are different there may be an issue (or you hit the point between master update and mirroring). 除此之外,您可以使用R本身并在主服务器和镜像服务器上指向
available.packages()
- 如果结果集不同则可能存在问题(或者您在主服务器更新和镜像之间达到了点)。
Here is a quick example: 这是一个简单的例子:
> main <- available.packages("http://cran.r-project.org/src/contrib",
+ method="wget")
> usmirror <- available.packages("http://cran.us.r-project.org/src/contrib",
+ method="wget")
> nrow(main)
[1] 2381
> nrow(usmirror) ## so the US mirror is 2 packages behind
[1] 2379
> setdiff(rownames(main), rownames(usmirror))
[1] "ProbForecastGOP" "semPLS" ## and these are the two
>
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