every_nth: Select every n'th element

In AkselA/R-ymse: Ymse (Various)

Description

Select every second, third, fourth etc. element (or slice/hyperplane) of an object

Usage

every_nth(...)

## Default S3 method:
every_nth(x, n = 2, start = 1, ...)

## S3 method for class 'matrix'
every_nth(x, n = 2, start = 1, margin = 1, ...)

## S3 method for class 'array'
every_nth(x, n = 2, start = 1, margin = 1, ...)

## S3 method for class 'data.frame'
every_nth(x, n = 2, start = 1, margin = 1, ...)

## S3 method for class 'list'
every_nth(x, n = 2, start = 1, ...)

Arguments

...	further arguments passed to methods
x	an object to be selected from
n	selection "step size"
start	integer in [1:n] specifying the start of selection
margin	what margin to select along

Examples

m <- matrix(1:64, 8)
every_nth(m, n=3, start=3, margin=2)

d <- data.frame(A=1:8, B=2:9, Q=letters[rep(1:3, length.out=8)])
every_nth(d, start=2)

a <- array(1:6^4, rep(6, 4))
every_nth(a)

l <- list(a=1:3, b=2:6, c=8:5, d=9:7, e=list(ea=1:2, eb=1), f=2:6)
every_nth(l, n=2, start=2)

AkselA/R-ymse documentation built on March 21, 2020, 9:52 a.m.