Description Usage Arguments Details Value

Efficient Fold, Reduce, Accumulate, Combine of a Vector

1 |

`x` |
A vector. |

`f` |
A binary function, i.e. a function take takes two arguments. |

`left` |
If |

`unname` |
If |

`threshold` |
An integer (>= 2) specifying the length where the
recursive divide-and-conquer call will stop and incremental building of
the partial value is performed. Using |

In order for recursive folding to give the same results as non-recursive
folding, binary function `f`

must be *associative* with itself, i.e.
`f(f(x[[1]], x[[2]]), x[[3]])`

equals
`f(x[[1]], f(x[[2]]), x[[3]])`

.

This function is a more efficient (memory and speed) of
`Reduce(f, x, right = !left, accumulate = FALSE)`

,
especially when `x`

is long.

A vector.

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