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use no_nulls::{rolling_apply_agg_window, RollingAggWindowNoNulls};
use super::sum::SumWindow;
use super::*;
pub struct MeanWindow<'a, T> {
sum: SumWindow<'a, T>,
}
impl<
'a,
T: NativeType + IsFloat + std::iter::Sum + AddAssign + SubAssign + Div<Output = T> + NumCast,
> RollingAggWindowNoNulls<'a, T> for MeanWindow<'a, T>
{
fn new(slice: &'a [T], start: usize, end: usize) -> Self {
Self {
sum: SumWindow::new(slice, start, end),
}
}
unsafe fn update(&mut self, start: usize, end: usize) -> T {
let sum = self.sum.update(start, end);
sum / NumCast::from(end - start).unwrap()
}
}
pub fn rolling_mean<T>(
values: &[T],
window_size: usize,
min_periods: usize,
center: bool,
weights: Option<&[f64]>,
) -> ArrayRef
where
T: NativeType + Float + std::iter::Sum<T> + SubAssign + AddAssign + IsFloat,
{
match (center, weights) {
(true, None) => rolling_apply_agg_window::<MeanWindow<_>, _, _>(
values,
window_size,
min_periods,
det_offsets_center,
),
(false, None) => rolling_apply_agg_window::<MeanWindow<_>, _, _>(
values,
window_size,
min_periods,
det_offsets,
),
(true, Some(weights)) => {
let weights = no_nulls::coerce_weights(weights);
no_nulls::rolling_apply_weights(
values,
window_size,
min_periods,
det_offsets_center,
no_nulls::compute_mean_weights,
&weights,
)
}
(false, Some(weights)) => {
let weights = no_nulls::coerce_weights(weights);
no_nulls::rolling_apply_weights(
values,
window_size,
min_periods,
det_offsets,
no_nulls::compute_mean_weights,
&weights,
)
}
}
}