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use crate::{List, VectorsGeneric};
use na::{
storage::Storage, ClosedAdd, ClosedDiv, ClosedMul, ClosedSub, Dim, Dynamic, Matrix, Matrix1xX,
MatrixSlice, RealField, Scalar, U3,
};
use num_traits::{cast, NumCast, Signed, Zero};
use std::cmp::PartialOrd;
pub fn slice<T, R, C, S>(
matrix: &Matrix<T, R, C, S>,
) -> MatrixSlice<'_, T, Dynamic, Dynamic, S::RStride, S::CStride>
where
T: Scalar,
R: Dim,
C: Dim,
S: Storage<T, R, C>,
{
matrix.slice((0, 0), matrix.shape())
}
pub fn number_vectors<T, S>(vectors: &VectorsGeneric<T, S>) -> usize
where
T: Scalar,
S: Storage<T, U3, Dynamic>,
{
vectors.ncols()
}
pub fn size_range_with_step<T>(start: T, end: T, step: T) -> usize
where
T: Scalar + NumCast + Copy + ClosedAdd + ClosedSub + ClosedDiv + ClosedMul + PartialOrd,
{
if Zero::is_zero(&cast::<T, f64>(step).unwrap())
|| Zero::is_zero(&cast::<T, f64>(end - start).unwrap())
|| (Signed::is_positive(&cast::<T, f64>(end - start).unwrap())
&& Signed::is_negative(&cast::<T, f64>(step).unwrap()))
|| (Signed::is_negative(&cast::<T, f64>(end - start).unwrap())
&& Signed::is_positive(&cast::<T, f64>(step).unwrap()))
{
return 1;
}
let mut size: usize = cast((end - start) / step).unwrap();
if start + cast::<usize, T>(size).unwrap() * step < end {
size += 1;
}
size + 1
}
pub fn linspace<T>(start: T, end: T, step: T) -> List<T>
where
T: Scalar + NumCast + ClosedSub + ClosedDiv + ClosedMul + ClosedAdd + PartialOrd + Copy,
{
let size = size_range_with_step(start, end, step);
let mut vector = Matrix1xX::from_fn(size, |_, j| start + step * cast(j).unwrap());
if vector[size - 1] > end {
vector[size - 1] = end;
}
vector
}
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)))
}