R Code.

A list of useful R code for Master, PhD and Post Graduate 

List of R Code Used by E3B Graduate Students

Basic R Commands:

• install.packages("package_name"): used to install a package into R, only needs to be done once
• library(package_name): used to run installed packages into R, needs to be run every time you open R
• search(): used to see a list of libraries currently loaded
• help(command_name):  used to request more information on how to use certain commands 
• vector_name <- c(vector_input): used to create a vector
  • x <- c(1:10) will create a vector of integers ranging from 1 to 10
  • x <- c(1, 5, by=0.5) will create a vector of integers ranging from 1 to 5 broken by 0.5 (i.e. 1.0, 1.5, 2.0, 2.5...5.0)
• matrix_name <- cbind(matrix_input): used to create a matrix consisting of two vectors; helpful for combining rows (rbind) and columns (cbind)
• read.table("file_name"): used to import data tables into R from csv or txt files