Function linearized_dwt53_row 

pub fn linearized_dwt53_row(
    sample_len: usize,
    band: Dwt53Band,
    output_index: usize,
) -> Option<Dwt53LinearRow>

Derive one conventional linearized 5/3 analysis row in constant work.

Returns None when output_index is outside the selected band’s output extent. Symmetric boundary extension is folded into the returned weights.