use ndarray::*;
use super::operator::*;
use super::types::*;
pub struct Diagonal<S: Data> {
diag: ArrayBase<S, Ix1>,
}
pub trait IntoDiagonal<S: Data> {
fn into_diagonal(self) -> Diagonal<S>;
}
pub trait AsDiagonal<A> {
fn as_diagonal(&self) -> Diagonal<ViewRepr<&A>>;
}
impl<S: Data> IntoDiagonal<S> for ArrayBase<S, Ix1> {
fn into_diagonal(self) -> Diagonal<S> {
Diagonal { diag: self }
}
}
impl<A, S: Data<Elem = A>> AsDiagonal<A> for ArrayBase<S, Ix1> {
fn as_diagonal(&self) -> Diagonal<ViewRepr<&A>> {
Diagonal { diag: self.view() }
}
}
impl<A, Sa> LinearOperator for Diagonal<Sa>
where
A: Scalar,
Sa: Data<Elem = A>,
{
type Elem = A;
fn apply_mut<S>(&self, a: &mut ArrayBase<S, Ix1>)
where
S: DataMut<Elem = A>,
{
for (val, d) in a.iter_mut().zip(self.diag.iter()) {
*val *= *d;
}
}
}