Slicing and extracting data

Question 1

x[n]

Answer 1

nth element

Question 2

x[-n]

Answer 2

all but the nth element

Question 3

x[1:n]

Answer 3

first n elements

Question 4

x[-(1:n)]

Answer 4

elements from n+1 to the end

Question 5

x[c(1,4,2)]

Answer 5

specific elements

Question 6

x[“name”]

Answer 6

element named “name”

Question 7

x[x>3]

Answer 7

all elements greater than 3

Question 8

x[x > 3 & x < 5]

Answer 8

all elements between 3 and 5

Question 9

x[x %in% c(“a”,”and”,”the”)]

Answer 9

elements in the given set

Question 10

LIST: x[n]

Answer 10

list with elements n

Question 11

x[[n]]

Answer 11

nth element of a list

Question 12

LIST: x[[“name”]]

Answer 12

element of the list named “name”

Question 13

LIST: x$name

Answer 13

id

Question 14

x[i, j]

Answer 14

element at row i, column j

Question 15

x[i,]

Answer 15

row i

Question 16

x[,j]

Answer 16

column j

Question 17

x[,c(1,3)]

Answer 17

columns 1 and 3

Question 18

x[name,]

Answer 18

row named “name”

Question 19

DATAFRAME: x[[“name”]]

Answer 19

column named “name”

Question 20

DATAFRAME: x$name

Answer 20

id