| c02akc | Zeros of a cubic polynomial with real coefficients |
| e01bac | Interpolating function, cubic spline interpolant, one variable |
| e01bec | Interpolating function, monotonicity-preserving, piecewise cubic Hermite, one variable |
| e02bac | Least-squares curve cubic spline fit (including interpolation), one variable |
| e02bbc | Evaluation of fitted cubic spline, function only |
| e02bcc | Evaluation of fitted cubic spline, function and derivatives |
| e02bdc | Evaluation of fitted cubic spline, definite integral |
| e02bec | Least-squares cubic spline curve fit, automatic knot placement, one variable |
| g10abc | Fit cubic smoothing spline, smoothing parameter given |
| g10acc | Fit cubic smoothing spline, smoothing parameter estimated |