R.md

R

R (INTRO DOC) is interpreted, follow Scheme's lexical scoping (the scope of variables is defined by placement in the source code), optimized for statistical analysis and data visualization, released in 1992.

R can be regarded as an implementation of the S language which was developed at Bell Laboratories by Rick Becker, John Chambers and Allan Wilks, and also forms the basis of the S-PLUS systems.

Packages available in the r-archive network, known as CRAN.

R is commonly used with the IDE RStudio.

R-Terminal

Call R.exe to enter. Call q() to quit it.

setwd() | sets working directory in R

# Create a text file using writeLines
text_content <- c("Hello, this is a test file.", "Line 2: Adding some content.")
writeLines(text_content, "test.txt")

renv

R also supports Virtal Environments via the renv library. Similar to other packages in R, it requires Rtools installed (get the Rtools43 installer).

Once Rtools is installed, one can create the virtual environment with shiny and postgresql connectivity like this:

# Install "renv" (this get installed in the root interpreter)
install.packages("renv")

# Set working directory
setwd("~/Rshiny")

# Calls the renv
library(renv)

# Start it in the workdir
renv::init()

# Install libraries one at a time, answering Y in the prompt.
renv::install("shiny")
renv::install("RPostgreSQL")

# Update the .lock file
renv::snapshot()