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use rand::Rng;
use crate::ArgminRandom;
macro_rules! make_random {
($t:ty) => {
impl ArgminRandom for ndarray::Array1<$t> {
fn rand_from_range(min: &Self, max: &Self) -> ndarray::Array1<$t> {
assert!(!min.is_empty());
assert_eq!(min.len(), max.len());
let mut rng = rand::thread_rng();
ndarray::Array1::from_iter(min.iter().zip(max.iter()).map(|(a, b)| {
#[allow(clippy::float_cmp)]
if a == b {
a.clone()
} else if a < b {
rng.gen_range(a.clone()..b.clone())
} else {
rng.gen_range(b.clone()..a.clone())
}
}))
}
}
impl ArgminRandom for ndarray::Array2<$t> {
fn rand_from_range(min: &Self, max: &Self) -> ndarray::Array2<$t> {
assert!(!min.is_empty());
assert_eq!(min.raw_dim(), max.raw_dim());
let mut rng = rand::thread_rng();
ndarray::Array2::from_shape_fn(min.raw_dim(), |(i, j)| {
let a = min.get((i, j)).unwrap();
let b = max.get((i, j)).unwrap();
#[allow(clippy::float_cmp)]
if a == b {
a.clone()
} else if a < b {
rng.gen_range(a.clone()..b.clone())
} else {
rng.gen_range(b.clone()..a.clone())
}
})
}
}
};
}
make_random!(isize);
make_random!(usize);
make_random!(i8);
make_random!(u8);
make_random!(i16);
make_random!(u16);
make_random!(i32);
make_random!(u32);
make_random!(i64);
make_random!(u64);
make_random!(f32);
make_random!(f64);
#[cfg(test)]
mod tests {
use super::*;
use ndarray::{array, Array1, Array2};
use paste::item;
macro_rules! make_test {
($t:ty) => {
item! {
#[test]
fn [<test_random_vec_ $t>]() {
let a = array![1 as $t, 2 as $t, 4 as $t];
let b = array![2 as $t, 3 as $t, 5 as $t];
let random = Array1::<$t>::rand_from_range(&a, &b);
for i in 0..3usize {
assert!(random[i] >= a[i]);
assert!(random[i] <= b[i]);
}
}
}
item! {
#[test]
fn [<test_random_mat_ $t>]() {
let a = array![
[1 as $t, 2 as $t, 4 as $t],
[2 as $t, 3 as $t, 5 as $t]
];
let b = array![
[2 as $t, 3 as $t, 5 as $t],
[3 as $t, 4 as $t, 6 as $t]
];
let random = Array2::<$t>::rand_from_range(&a, &b);
for i in 0..3 {
for j in 0..2 {
assert!(random[(j, i)] >= a[(j, i)]);
assert!(random[(j, i)] <= b[(j, i)]);
}
}
}
}
};
}
make_test!(i8);
make_test!(u8);
make_test!(i16);
make_test!(u16);
make_test!(i32);
make_test!(u32);
make_test!(i64);
make_test!(u64);
make_test!(isize);
make_test!(usize);
make_test!(f32);
make_test!(f64);
}