R markdown打不开
版本3.2.4，Rstudio-newfile-R markdown ，运行很久，出来
Warning: unable to access index for repository https://cran.rstudio.com/src/contrib:
cannot open URL 'https://cran.rstudio.com/src/contrib/PACKAGES'
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版本3.2.4，Rstudio-newfile-R markdown ，运行很久，出来
Warning: unable to access index for repository https://cran.rstudio.com/src/contrib:
cannot open URL 'https://cran.rstudio.com/src/contrib/PACKAGES'
2016-04-29
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