Function malachite_base::vecs::random::random_vecs_length_range
source · pub fn random_vecs_length_range<I: Iterator>(
seed: Seed,
a: u64,
b: u64,
xs_gen: &dyn Fn(Seed) -> I
) -> RandomVecs<I::Item, RandomUnsignedRange<u64>, I> ⓘ
Expand description
Generates random Vec
s with lengths in $[a, b)$, using elements from an iterator.
The lengths of the Vec
s are sampled from a uniform distribution on $[a, b)$. $a$ must be
less than $b$.
$$ P((x_i)_{i=0}^{n-1}) = \begin{cases} \frac{1}{b-a}\prod_{i=0}^{n-1}P(x_i) & \text{if} \quad a \leq n < b, \\ 0 & \text{otherwise}. \end{cases} $$
xs_gen
must be infinite.
Panics
Panics if $a \geq b$.
Examples
use itertools::Itertools;
use malachite_base::num::random::random_primitive_ints;
use malachite_base::random::EXAMPLE_SEED;
use malachite_base::vecs::random::random_vecs_length_range;
let xs = random_vecs_length_range(EXAMPLE_SEED, 2, 5, &random_primitive_ints::<u8>);
let values = xs.take(20).collect_vec();
assert_eq!(
values.iter().map(Vec::as_slice).collect_vec().as_slice(),
&[
&[85, 11, 136][..],
&[200, 235, 134, 203],
&[223, 38, 235],
&[217, 177, 162, 32],
&[166, 234, 30, 218],
&[90, 106, 9],
&[216, 204],
&[151, 213, 97],
&[253, 78],
&[91, 39, 191, 175],
&[170, 232, 233, 2],
&[35, 22, 217],
&[198, 114, 17, 32],
&[173, 114, 65],
&[121, 222, 173, 25],
&[144, 148, 79, 115],
&[52, 73, 69, 137],
&[91, 153],
&[178, 112, 34, 95],
&[106, 167]
]
);