abs()
computes the absolute value of a number
ls()
lists all objects in the environment
rm()
removes objects from the environment
getwd()
get the working directory
round(3.2464, digits=3)
rounds the number to 3 digits
c()
combines values and characters together
length()
gives the total number of elements in a list
max()
gives largest element
mean()
computes mean from a list of numbers
range()
computes range
sum()
computes sum
names(classify)[classify==max(classify)]
computes the mode
median()
computes the median