Split a Vector at Given Positions

Splits a vector into consecutive segments at specified positions.

Usage

splitAt(x, pos)

Arguments

x

a vector to be split.

pos

an integer vector of positions at which to split x. Positions refer to indices in x where a new segment should start.

Value

a list of vectors, each representing a segment of x.

Details

The function splits x into consecutive chunks defined by pos. Internally, positions are sorted, duplicates are removed, and values that would not produce a non-empty segment (pos < 2 or pos > length(x)) are ignored. Empty segments are never returned.

Each element of the returned list corresponds to a contiguous subset of x. The first segment always starts at position 1.

See also

split()

Other data.reshape: collapseTable(), long-wide-reshape, splitX(), untable()

Examples

x <- 1:10

# split at positions 4 and 7
splitAt(x, c(4, 7))
#> [[1]]
#> [1] 1 2 3
#> 
#> [[2]]
#> [1] 4 5 6
#> 
#> [[3]]
#> [1]  7  8  9 10
#> 

# unsorted and duplicate positions are handled
splitAt(x, c(7, 4, 4, 20))
#> [[1]]
#> [1] 1 2 3
#> 
#> [[2]]
#> [1] 4 5 6
#> 
#> [[3]]
#> [1]  7  8  9 10
#>