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[SPARK-17736][DOCUMENTATION][SPARKR] Update R README for rmarkdown,…

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## What changes were proposed in this pull request?

To build R docs (which are built when R tests are run), users need to install pandoc and rmarkdown. This was done for Jenkins in ~~[SPARK-17420](https://issues.apache.org/jira/browse/SPARK-17420)~~

… pandoc]

Author: Jagadeesan <as2@us.ibm.com>

Closes #15309 from jagadeesanas2/SPARK-17736.
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Jagadeesan 2016-10-03 10:46:38 +01:00 committed by Sean Owen
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@ -19,8 +19,8 @@ installed. Also install the following libraries:
$ sudo gem install jekyll jekyll-redirect-from pygments.rb
$ sudo pip install Pygments
# Following is needed only for generating API docs
$ sudo pip install sphinx
$ sudo Rscript -e 'install.packages(c("knitr", "devtools", "roxygen2", "testthat"), repos="http://cran.stat.ucla.edu/")'
$ sudo pip install sphinx pypandoc
$ sudo Rscript -e 'install.packages(c("knitr", "devtools", "roxygen2", "testthat", "rmarkdown"), repos="http://cran.stat.ucla.edu/")'
```
(Note: If you are on a system with both Ruby 1.9 and Ruby 2.0 you may need to replace gem with gem2.0)