R Commands

Common R commands.

typeof()

Type of object

typeof(d)

Dataframes

nrows()

Count rows in dataframe d

nrow(d)

d[ d$col == 'condition' ]

Filter dataframe d by column col

d2 <- d[ d$col == 'condition' ]

Vectors

list()

Construct a list, evaluating elements before saving them in the list.

mylist <- list(1,2,3,4,5)

alist()

Construct a list without evaluating the elements.

mylist <- alist( dunif(75, 0, 100) )

c()

Combine values into a vector.

> c(1,2,3,4,5)
[1] 1 2 3 4 5

Distributions

dnorm(x, 1, 1)

Gives the value of the normal pdf at x

RStudio

rm(list = ls() )

Remove all data from the global environment.