R Programming

Front 1

str()

Back 1

structure - This function shows the internal structure of any R object.

Front 2

hist()

Back 2

generates a simple histogram

Front 3

<-

Back 3

the standard assignment operator in R. "=" can also be used, but this is discouraged, as it does not work in some special situations.

Front 4

when assigning values to a vector, what does the "c" mean?

Back 4

concatenate.

Front 5

mean()

Back 5

finds the mean of a variable(s)

Front 6

sd()

Back 6

finds the standard deviation of a variable(s)

Front 7

#

Back 7

This is used to write comments.

Front 8

data()

Back 8

calls up a list of R's internal data sets.

Front 9

q()

Back 9

Quit R. You will be asked if you want to save the session.

Front 10

length()

Back 10

returs the length of a vector/character string

Front 11

mode()

Back 11

returns mode of a vector/character string ("numeric" or "character")

Front 12

paste()

Back 12

concatenates a character string

Front 13

strsplit()

Back 13

splits a character string according to blanks

Front 14

rbind(c())

Back 14

row bind function. builds a matrix from two vectors that will serve as its rows.

Front 15

cbind(c())

Back 15

column bind function. builds a matrix from two vectors that will serve as its columns.