| e02agc | Least-squares polynomial fit, values and derivatives may be constrained, arbitrary data points |
| e02bac | Least-squares curve cubic spline fit (including interpolation), one variable |
| e02bec | Least-squares cubic spline curve fit, automatic knot placement, one variable |
| e02cac | Least-squares surface fit by polynomials, data on lines |
| e02dcc | Least-squares bicubic spline fit with automatic knot placement, two variables (rectangular grid) |
| e02ddc | Least-squares bicubic spline fit with automatic knot placement, two variables (scattered data) |
| e04ncc | Solves linear least-squares and convex quadratic programming problems (non-sparse) |
| e04unc | Solves nonlinear least-squares problems using the sequential QP method |
| e04yac | Least-squares derivative checker for use with e04gbc |
| e04ycc | Covariance matrix for nonlinear least-squares |