Section 1
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as.character()
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Last updated
6 years ago
Date created
Mar 14, 2020
Cards (55)
Section 1
(50 cards)
as.character()
R function that converts an object to character class
rnorm
R function that generates random number from the normal distribution
noquote()
R function that shows the contents of an object without quotes
cat()
R function that concatenates two or more objects and print without quotes
toupper()
R function that converts all characters in a string to upper case
which(x == y)
R function that finds where the pairwise equal values are located in vectors x and y
as.numeric()
R function that converts an object to numeric
levels()
R function that reveals the factor levels of a factor object
as.double()
R function that converts an object to double
integer
A whole number
seed
A number used to initialize a fixed sequence of random numbers
>=
"Greater than or equal to" operator
union()
R function that produces the elements contained in either set
identical(x,y)
R function that indicates whether or no two vectors contain identical elements in the same order
tolower()
R function that converts all characters in a string to lower case
double
Floating point numbers
class()
R function that reveals the class of object
==
"Equal to" operator
normal distribution
Probability distribution that yields a symmetric bell-curve, commonly used to represent random variables in many applications
as.integer()
R function that converts an object to an integer
intersect()
R function that produces the elements contained in both sets
chartr()
R function that replaces a character in a string
rep()
R function that replicates the values of a sequence
numeric
Synonymous with Double, also means floating point numbers
unclass()
R function that returns a copy of the object with its class attribute removed
abbreviate()
R function that abbreviates words within a character string
ceiling(x)
R function that rounds up to the next higher integer
factors
An object used to represent a categorical variable consisting of levels
runif()
R function that generates random numbers from the uniform distribution
sum(x == y)
R function that finds the number of pairwise equal values in vectors x and y
<=
"Less than or equal to" operator
concatenate
A term that describes combining a string, text, or other data to form a single object
>
"Greater than" operator
is.character()
R function that determines whether or not an object is of character class
<
"Less than" operator
floor(x)
R function that rounds down to the next lowest integer
character
An object used to represent string values
paste(a, b)
R function that concatenates two objects a and b into a single object
print()
R function that shows the contents of an object
factor(c())
R function that converts a vector to factor class
!=
"Not equal to" operator
seq()
R function that generates a sequence
uniform distribution
Probability distribution where all outcomes are equally likely
Sequence
A set of numbers following a consistent pattern from element to element in the set
levels
The categories of a factor
typeof()
R function that checks the data type of an object
strsplit()
R function that splits elements of a character string
setdiff()
R function that produces the elements in one set, but not the other
plyr::revalue()
R function from the plyr package that re-values the levels of a factor
round(x)
R function that rounds an object to the nearest integer
Section 2
(5 cards)