| e02bac | nag_1d_spline_fit_knots Least-squares curve cubic spline fit (including interpolation), one variable |
| e02bec | nag_1d_spline_fit Least-squares cubic spline curve fit, automatic knot placement, one variable |
| g10abc | nag_smooth_spline_fit Fit cubic smoothing spline, smoothing parameter given |
| g10acc | nag_smooth_spline_estim Fit cubic smoothing spline, smoothing parameter estimated |