| F04AMF | Least-squares solution of m real equations in n unknowns, rank = n, m ≥ n using iterative refinement (Black Box) |
| F04JAF | Minimal least-squares solution of m real equations in n unknowns, rank ≤ n, m ≥ n |
| F04JDF | Minimal least-squares solution of m real equations in n unknowns, rank ≤ n, m ≥ n |
| F04JGF | Least-squares (if rank = n) or minimal least-squares (if rank < n) solution of m real equations in n unknowns, rank ≤ n, m ≥ n |
| F04JLF | Real general Gauss–Markov linear model (including weighted least-squares) |
| F04KLF | Complex general Gauss–Markov linear model (including weighted least-squares) |
| F04QAF | Sparse linear least-squares problem, m real equations in n unknowns |
| F04YAF | Covariance matrix for linear least-squares problems, m real equations in n unknowns |