| C02AKF | All zeros of real cubic equation |
| C02AMF | All zeros of complex cubic equation |
| E01BAF | Interpolating functions, cubic spline interpolant, one variable |
| E01BEF | Interpolating functions, monotonicity-preserving, piecewise cubic Hermite, one variable |
| 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 |
| G10ABF | Fit cubic smoothing spline, smoothing parameter given |
| G10ACF | Fit cubic smoothing spline, smoothing parameter estimated |