tree f3bb526c67edb5348e2ea40584e2bb76d3cbb22d
parent 03d64141ae437f7b686ca3501b744cdc4d403858
author Sameer Agarwal <sameeragarwal@google.com> 1631632641 -0700
committer Sameer Agarwal <sameeragarwal@google.com> 1631712062 -0700

Add NumericDiffFirstOrderFunction

This has been a long requested feature so that users can minimize
functions using numeric differentiation.

As part of this, I have also redone rosenbrock.cc, which now has three
variants.

rosenbrock.cc now uses automatic differentiation.
rosenbrock_numeric_diff.cc uses numeric differentiation.
rosenbrock_analytic_diff.cc uses analytic derivatives.

This is analogus to how the helloworld example code is structured.

The tutorial for GradientProblemSolver has also been updated to reflect
this.

https://github.com/ceres-solver/ceres-solver/issues/691

Change-Id: Ib0fb9e35127fe4c8299d4793bea3558722c70dd7