A

### References C.J.F. Ridders, Accurate computation of F'(x) and F'(x) F"(x), Advances in Engineering Software (1978), Volume 4, Issue 2, April 1982, Pages 75-76, ISSN 0141-1195, http://dx.doi.org/10.1016/S0141-1195(82)80057-0. ### Example ```IPOpt:...

Add support for a derivatives checker via finite differences to test, Jacobian and Hessian Also add a feature to see/check if user is providing J^T instead of J and the...

Part 1 just committed to `box-logic` branch.

@tyronerees while updating the Jacobian, it is also convenient to update the error list and remove error -9 which is no longer possible (n>m)

Doc also needs to be updated with: for `nlls_options` 1. All the `box_*` options 2. New covariance storage option `options%save_covm`. for `nlls_inform` 1. New elements where the covariance (J^T *J)...