Calculates rolling sums of length k for all contiguous subsequences
around a circular vector. Returns sums for each valid k-element window
that wraps around the vector as if arranged in a circle.
Usage
circsum(x, size, step = size)
Arguments
- x
A numeric vector to compute circular sums over.
- size
Integer; the window size (number of consecutive elements to sum).
- step
Integer; the step size (the increment in starting index for each sum).
Value
A numeric vector containing the sum of each contiguous subsequence
around the circle. The length of the resulting vector is the number of
combinations until the pattern between x and step repeats
Examples
# Simple circular sum with window of 2
circsum(c(1, 2, 3, 4), 2)
#> [1] 3 7
# Returns: 3 7 (1+2, 3+4)
# Window of 3 elements
circsum(c(1, 2, 3, 4, 5), 3)
#> [1] 6 10 9 8 12
# Returns: 6 10 9 8 12 (1+2+3, 4+5+1, 2+3+4, 5+1+2, 3+4+5)
