diff1_n: 1-Unit Lagged Differences for Numeric Values

In dvmisc: Faster Computation of Common Statistics and Miscellaneous Functions

Description

Written in C++, this function should always run faster than diff for calculating differences between adjacent values of a numeric vector. For integer vectors, diff1_i should run even faster.

Usage

diff1_n(x)

Arguments

x	Numeric vector.

Value

Numeric vector.

Examples

# In general, diff1_n is much faster than diff
x <- rnorm(1000)
all.equal(diff(x), diff1_n(x))
benchmark(diff(x), diff1_n(x), replications = 3000)

# For integer vectors, diff1_i should be even faster
x <- rpois(1000, lambda = 5)
all.equal(diff(x), diff1_i(x))
benchmark(diff(x), diff1_n(x), diff1_i(x), replications = 3000)

dvmisc documentation built on May 2, 2019, 5:51 p.m.