| E01BAF | Interpolating functions, cubic spline interpolant, one variable |
| E01DAF | Interpolating functions, fitting bicubic spline, data on rectangular grid |
| E02BAF | Least-squares curve cubic spline fit (including interpolation) |
| E02BBF | Evaluation of fitted cubic spline, function only |
| E02BCF | Evaluation of fitted cubic spline, function and derivatives |
| E02BDF | Evaluation of fitted cubic spline, definite integral |
| E02BEF | Least-squares cubic spline curve fit, automatic knot placement |
| E02DEF | Evaluation of fitted bicubic spline at a vector of points |
| E02DFF | Evaluation of fitted bicubic spline at a mesh of points |
| G10ABF | Fit cubic smoothing spline, smoothing parameter given |
| G10ACF | Fit cubic smoothing spline, smoothing parameter estimated |