| D02UDF | Differentiate a function by the FFT using function values on Chebyshev grid |
| D04AAF | Numerical differentiation, derivatives up to order 14, function of one real variable |
| D04BAF | Numerical differentiation, user-supplied function values, derivatives up to order , derivatives with respect to one real variable |
| E04XAF | Estimate (using numerical differentiation) gradient and/or Hessian of a function |