Function polars::functions::pearson_corr

pub fn pearson_corr<T>(
    a: &ChunkedArray<T>, 
    b: &ChunkedArray<T>
) -> Option<<T as ArrowPrimitiveType>::Native> where
    T: PolarsFloatType,
    <T as ArrowPrimitiveType>::Native: Float,
    ChunkedArray<T>: ChunkVar<<T as ArrowPrimitiveType>::Native>,