Function low_rank_approx_ndarray 

pub fn low_rank_approx_ndarray<T>(
    a: &Array2<T>,
    k: usize,
) -> LapackResult<Array2<T>>
where
    T: Field + Clone + Zeroable + Real,

Computes a low-rank approximation of a matrix.

Returns A_k = U_k Σ_k V_k^T, the best rank-k approximation in Frobenius norm.

Arguments

• a - The input matrix (m×n)
• k - Target rank

Returns

The rank-k approximation as a matrix