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plot(cars)

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install.packages("rmarkdown")

Installing package into <U+393C><U+3E31>C:/Users/ocfit/Documents/R/win-library/3.4<U+393C><U+3E32>
(as <U+393C><U+3E31>lib<U+393C><U+3E32> is unspecified)

Warning in install.packages :
  cannot open URL 'http://www.stats.ox.ac.uk/pub/RWin/bin/windows/contrib/3.4/PACKAGES.rds': HTTP status was '404 Not Found'

trying URL 'https://cran.rstudio.com/bin/windows/contrib/3.4/rmarkdown_1.6.zip'
Content type 'application/zip' length 2276273 bytes (2.2 MB)
downloaded 2.2 MB

package ‘rmarkdown’ successfully unpacked and MD5 sums checked

The downloaded binary packages are in
    C:\Users\ocfit\AppData\Local\Temp\RtmpsxC6t2\downloaded_packages