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use crate::{List, Vectors};
use itertools::multizip;
use na::base::storage::Storage;
use na::{convert, Dim, Matrix, Matrix1xX, RealField};
pub fn slice<N, R, C, S1>(matrix: &Matrix<N, R, C, S1>) -> crate::Slice<'_, N, R, C, S1>
where
N: RealField,
R: Dim,
C: Dim,
S1: Storage<N, R, C>,
{
let shape = matrix.shape();
matrix.slice((0, 0), shape)
}
pub fn number_vectors<T>(vectors: &Vectors<T>) -> usize
where
T: RealField,
{
vectors.ncols()
}
pub fn size_range_with_step(start: f64, end: f64, step: f64) -> usize {
let mut size = ((end - start) / step) as usize;
if start + size as f64 * step < end {
size += 1;
}
size + 1
}
pub fn linspace<T>(start: f64, end: f64, step: f64) -> Matrix1xX<T>
where
T: RealField,
{
let size = size_range_with_step(start, end, step);
let mut vector = Matrix1xX::from_fn(size, |_, j| convert(start + step * j as f64));
if vector[size - 1] > convert(end) {
vector[size - 1] = convert(end);
}
vector
}
pub fn dot_products<T>(vectors_1: &Vectors<T>, vectors_2: &Vectors<T>) -> List<T>
where
T: RealField,
{
let size = crate::number_vectors(vectors_1);
let mut dot_products = List::<T>::zeros(size);
for (res, vector_1, vector_2) in multizip((
dot_products.iter_mut(),
vectors_1.row_iter(),
vectors_2.row_iter(),
)) {
*res = vector_1.dot(&vector_2);
}
dot_products
}
pub fn clip<T>(list: &List<T>, min: Option<T>, max: Option<T>) -> List<T>
where
T: RealField,
{
let mut work_list = list.clone();
for element in work_list.iter_mut() {
if let Some(mini) = min {
if *element < mini {
*element = mini
};
}
if let Some(max) = max {
if *element > max {
*element = max
};
}
}
work_list
}
pub fn pows<T>(list: &List<T>, power: i32) -> List<T>
where
T: RealField,
{
List::from_iterator(list.len(), list.iter().map(|x| x.powi(power)))
}