| 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 parallel to one independent coordinate axis |
| e02dac | Least squares surface fit, bicubic splines |
| 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) |
| e02dhc | Evaluation of spline surface at mesh of points with derivatives |
| 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 |
| f08bac | Computes the minimum-norm solution to a real linear least squares problem |
| f08bnc | Computes the minimum-norm solution to a complex linear least squares problem |
| f08kac | Computes the minimum-norm solution to a real linear least squares problem using singular value decomposition |
| f08kcc | Computes the minimum-norm solution to a real linear least squares problem using singular value decomposition (divide-and-conquer) |
| f08knc | Computes the minimum-norm solution to a complex linear least squares problem using singular value decomposition |
| f08kqc | Computes the minimum-norm solution to a complex linear least squares problem using singular value decomposition (divide-and-conquer) |
| f08zac | Solves the real linear equality-constrained least squares (LSE) problem |
| f08znc | Solves the complex linear equality-constrained least squares (LSE) problem |