//! some linear algebra functions used throughout the code
/// diagnostics for linear systems and matrices: if it is singular
/// or poorly conditioned
/// Safe Rust interface to the optional, dynamically loaded SuperLU backend.
/// Shared safe API for optional SuperLU sparse factorizations.
/// Experimental reusable sparse LU kernel isolated for BVP_sci work.
pub
/// Dense column-pivoted QR and diagonal least-squares kernels.