Module utils 

Shared statistical utilities for anomaly detection window functions.

Functions

anomaly_ratio

Compute a non-negative anomaly score ratio with stable zero-denominator semantics.

cast_to_f64

Cast an ArrayRef to Float64. Returns the array as-is if already Float64.

collect_window_values

Collect valid f64 values from a Float64Array within the given range, skipping NULL, NaN, and ±Inf values.

median_f64

Compute median of a mutable slice using O(n) selection algorithm.

percentile_sorted

Compute percentile on a sorted slice using linear interpolation.