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use ndarray::*;
use super::convert::*;
use super::operator::*;
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<'a>(&'a self) -> Diagonal<ViewRepr<&'a 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<'a>(&'a self) -> Diagonal<ViewRepr<&'a A>> {
Diagonal { diag: self.view() }
}
}
impl<A, S, Sr> OperatorInplace<Sr, Ix1> for Diagonal<S>
where
A: LinalgScalar,
S: Data<Elem = A>,
Sr: DataMut<Elem = A>,
{
fn op_inplace<'a>(&self, mut a: &'a mut ArrayBase<Sr, Ix1>) -> &'a mut ArrayBase<Sr, Ix1> {
for (val, d) in a.iter_mut().zip(self.diag.iter()) {
*val = *val * *d;
}
a
}
}
impl<A, S, Sr> Operator<A, Sr, Ix1> for Diagonal<S>
where
A: LinalgScalar,
S: Data<Elem = A>,
Sr: Data<Elem = A>,
{
fn op(&self, a: &ArrayBase<Sr, Ix1>) -> Array1<A> {
let mut a = replicate(a);
self.op_inplace(&mut a);
a
}
}
impl<A, S, Sr> OperatorInto<Sr, Ix1> for Diagonal<S>
where
A: LinalgScalar,
S: Data<Elem = A>,
Sr: DataOwned<Elem = A> + DataMut,
{
fn op_into(&self, mut a: ArrayBase<Sr, Ix1>) -> ArrayBase<Sr, Ix1> {
self.op(&mut a);
a
}
}
impl<A, S, Sr> OperatorInplace<Sr, Ix2> for Diagonal<S>
where
A: LinalgScalar,
S: Data<Elem = A>,
Sr: DataMut<Elem = A>,
{
fn op_inplace<'a>(&self, mut a: &'a mut ArrayBase<Sr, Ix2>) -> &'a mut ArrayBase<Sr, Ix2> {
let ref d = self.diag;
for ((i, _), val) in a.indexed_iter_mut() {
*val = *val * d[i];
}
a
}
}
impl<A, S, Sr> Operator<A, Sr, Ix2> for Diagonal<S>
where
A: LinalgScalar,
S: Data<Elem = A>,
Sr: Data<Elem = A>,
{
fn op(&self, a: &ArrayBase<Sr, Ix2>) -> Array2<A> {
let mut a = replicate(a);
self.op_inplace(&mut a);
a
}
}
impl<A, S, Sr> OperatorInto<Sr, Ix2> for Diagonal<S>
where
A: LinalgScalar,
S: Data<Elem = A>,
Sr: DataOwned<Elem = A> + DataMut,
{
fn op_into(&self, mut a: ArrayBase<Sr, Ix2>) -> ArrayBase<Sr, Ix2> {
self.op(&mut a);
a
}
}