factorize {sfsmisc}

Prime Factorization of Integers

Description

Compute the prime factorization(s) of integer(s) n.

Usage

factorize(n, verbose = FALSE)

Arguments

n

vector of integers to factorize.

verbose

logical indicating if some progress information should be printed.

Details

works via primes, currently in a cheap way, sub-optimal for large composite n.

Value

A named list of the same length as n, each element a 2-column matrix with column "p" the prime factors and column~"m" their respective exponents (or multiplities), i.e., for a prime number n, the resulting matrix is cbind(p = n, m = 1).

Author(s)

Martin Maechler, Jan. 1996.

See Also

primes.

For factorization of moderately or really large numbers, see the gmp package, and its factorize().

Examples

 factorize(47)
 factorize(seq(101, 120, by=2))