Getting Help

Question 1

help(topic)

Answer 1

documentation on topic

Question 2

?topic

Answer 2

id.

Question 3

help.search(“topic”)

Answer 3

search the help system

Question 4

apropos(“topic”)

Answer 4

the names of all objects in the search list matching

the regular expression ”topic”

Question 5

help.start()

Answer 5

start the HTML version of help

Question 6

str(a)

Answer 6

display the internal structure of an R object

Question 7

summary(a)

Answer 7

gives a “summary” of a, usually a statistical summary but it is
generic meaning it has different operations for different classes of a

Question 8

ls()

Answer 8

show objects in the search path; specify pat=”pat” to search on a
pattern

Question 9

ls.str()

Answer 9

str() for each variable in the search path

Question 10

dir()

Answer 10

show files in the current directory

Question 11

methods(a)

Answer 11

shows S3 methods of a

Question 12

methods(class=class(a))

Answer 12

ists all the methods to handle objects of
class a