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Step by step guide to installing and using miktex with RStudio (Windows)

Using miktex with Rstudio is very easy with the miktex portable app available from http://miktex.org/portable.

Steps
1. Follow the instructions from http://miktex.org/portable to download and unzip the miktex portable application in a loccation of your choice.
2. In R write the following code in a script and save it. Note that the E:\\Software-Silo\\Miktex\\miktex\\bin location is the location where I unzipped the miktex portable application.

# Install miktex
y <- Sys.getenv("PATH")
x <- paste0(y,";","E:\\Software-Silo\\Miktex\\miktex\\bin")
Sys.setenv(PATH=x)
3. Run Miktex by double clicking the following application "miktex-portable.cmd" in the Miktex main directory.
4. Run step 2 in RStudio to install the path into R environment.
5. Open a new RNW in RStudio to test whether Miktex works .
6. Run Compile PDF in RStudio. It should be just at the top of the RNW file created in step 5.
7. You will now see a PDF file which is just a base file you can use to build further on.
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