changesPos: Find positions in a vector that have a different value from...

In droglenc/FSAmisc: Miscellaneous functions for simple fisheries stock assessment methods

Find positions in a vector that have a different value from the previous position.

Description

Find positions in a vector that have a different value from the previous position.

Usage

changesPos(x, include.first = TRUE)

Arguments

x	A vector of sorted (generally) values.
include.first	A logical that indicates whether the returned vector of positions should have a “1” at the beginning (i.e., by definition the first position is the first position that is different than the previous value).

Value

A vector of positions in x where the value differs from the value in the previous position.

Author(s)

Derek H. Ogle, [e-mail]

Examples

x <- rep(LETTERS[1:6],times=c(5,4,1,1,2,4))
data.frame(pos=1:length(x),x)  # for demonstration only
changesPos(x)
v <- rep(10:17,times=c(4,1,1,2,4,2,1,1))
data.frame(pos=1:length(v),v)  # for demonstration only
changesPos(v)
## An uninteresting example -- i.e., vector not sorted
z <- sample(10:17,20,replace=TRUE)
data.frame(pos=1:length(z),z)  # for demonstration only
changesPos(z)
z1 <- z[order(z)]
data.frame(pos=1:length(z1),z1)  # for demonstration only
changesPos(z1)

droglenc/FSAmisc documentation built on Jan. 8, 2023, 12:59 a.m.