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numeric

For representing numeric values as doubles

Constants

Action	Code	Details
Min value	.Machine$double.xmin
Max value	.Machine$double.xmax
Epsilon: smallest representable addition difference	.Machine$double.eps
Negative epsilon: smallest representable subtraction difference	.Machine$double.neg.eps
Missing value (NA)	NA_real_
Not a number (NaN)	NaN
Positive infinity	Inf
Negative infinity	-Inf

Create

Action	Code	Details
Empty numeric vector, length 0	numeric()

Numeric vectors

Action	Code	Details
Numeric vector of zeros, length n	numeric(n)
Cast to numeric	as.numeric(y)
Parse string to numeric	as.numeric(y)	Parse failures return NA

Test

Action	Code	Details
Is numeric	is.numeric(x)	Integers are also numeric
Is numeric, but not integer	storage.mode(x) == 'double'

Tests for single number(s)

Action	Code	Details
Is equal to number	isTRUE(all.equal(x, y))
Is equal to number	abs(x - y) < .Machine$double.eps
Is equal to number with tolerance t	isTRUE(all.equal(x, y, tolerance = t))
Is equal to number with tolerance t	abs(x - y) < t

Tests for vector

Action	Code	Details
All elements are equal (no NAs present)	abs(max(x) - min(x)) < .Machine$double.neg.eps
All elements are equal (with NAs)	isTRUE(all.equal(x, y))
All elements are equal within absolute tolerance t (no NAs present)	abs(max(x) - min(x)) < t
All elements are equal within absolute tolerance t	isTRUE(all.equal(x, y, tolerance = t))
Are all elements whole numbers (no NAs present)	all(x == round(x))
Are all elements whole numbers (no NAs present)	max(x %% 1) < .Machine$double.neg.eps
Are all elements whole numbers?	max(x %% 1, na.rm = TRUE) < .Machine$double.neg.eps
Are all elements rounded to at most p decimals? (no NAs present)	all(x == round(x, p))	For example, for p=1: 0.1, -2.6, for p=2: 0.11, -2.63
Are all elements rounded to at most p decimals? (no NAs present)	all(x == round(x, p), na.rm = TRUE)

Derive

Action	Code	Details
Floor	floor(x)	trunc(2.6) = 2, trunc(-2.5) = -3
Ceiling	ceiling(x)	ceiling(2.6) = 3, ceiling(-2.5) = -2
Truncate to integer	trunc(x)	trunc(2.6) = 2, trunc(-2.5) = -2
Round to d decimal places	round(x, d)	round(2.6) = 3, round(-2.55, 1) = -2.5
Round to nearest _p_th power of ten	round(x, -p)	round(520, -2) = 500
Round to _d_th significant digits	signif(x, d)

Convert

Action	Code	Details
To integer (truncate)	as.integer(x)

Format as string

Action	Code	Details
To string	as.character(x)
Format with thousands separator (comma)	scales::comma(x)
Format with d significant digits	formatC(x, digits = d, format='fg')
Format as percentage	scales::percent(x)
Format with sign prefix	formatC(x, format = 'f', flag = '+', drop0trailing = TRUE)
Format with scientific notation	formatC(x, format = 'e')
Format with scientific notation and sign prefix	formatC(x, format = 'e', flag = '+')
Format with scientific notation, with d significant digits	formatC(x, format = 'e', digits = d)