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WARNING: You are configured to use the CRAN mirror at https://cran.rstudio.com/. This mirror supports secure (HTTPS) downloads however your system is unable to communicate securely with the server (possibly due to out of date certificate files on your sys

win10   R3.3.1



WARNING: You are configured to use the CRAN mirror at https://cran.rstudio.com/. This mirror supports secure (HTTPS) downloads however your system is unable to communicate securely with the server (possibly due to out of date certificate files on your system). Falling back to using insecure URL for this mirror.

To learn more and/or disable this warning message see the "Use secure download method for HTTP" option in Tools -> Global Options -> Packages.



这个怎么解决啊？

qq_wuli咕咕_03625035

2016-08-11

源自：R语言基础  2-1

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慕盖茨5560756
2016-08-12

应该是先选择一个镜像   可以理解为服务器    然后在packages中选择你要下载的包  安装即可

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