R Language

#variable declaration
my_integer <- 3
my_numeric <- 3.2
my_char <- "this considered char"
my_bool_1 <- TRUE
my_bool_2 <- T
my_bool_3 <- FALSE
my_bool_4 <- F

http://www.r-bloggers.com/google-ai-challenge-languages-used-by-the-best-programmers/?utm_source=feedburner&utm_medium=twitter&utm_campaign=Feed%3A+RBloggers+(R+bloggers)

R array is 1 based. it starts from 1 instead of 0.

NLP http://www.vikparuchuri.com/blog/natural-language-processing-tutorial/

• vector
• matrix
• factor
• factor level
• named matrix