pub fn cov_f<T>(
a: &ChunkedArray<T>,
b: &ChunkedArray<T>
) -> Option<<T as PolarsNumericType>::Native> where
T: PolarsFloatType,
<T as PolarsNumericType>::Native: Float,
<<T as PolarsNumericType>::Native as Simd>::Simd: Add<<<T as PolarsNumericType>::Native as Simd>::Simd>,
<<T as PolarsNumericType>::Native as Simd>::Simd: Sum<<T as PolarsNumericType>::Native>,
<<T as PolarsNumericType>::Native as Simd>::Simd: SimdOrd<<T as PolarsNumericType>::Native>,
<<<T as PolarsNumericType>::Native as Simd>::Simd as Add<<<T as PolarsNumericType>::Native as Simd>::Simd>>::Output == <<T as PolarsNumericType>::Native as Simd>::Simd, Expand description
Compute the covariance between two columns.