CppAD: A C++ Algorithmic Differentiation Package  20171217
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template<class Dvector, class ADvector, class FG_eval>
virtual bool CppAD::ipopt::solve_callback< Dvector, ADvector, FG_eval >::eval_grad_f ( Index  n,
const Number x,
bool  new_x,
Number grad_f 

Evaluate the gradient of f(x).

[in]nis the dimension of the argument space for f(x); i.e., must be equal nx_.
[in]xhas a vector of size nx_ containing the point at which to evaluate the gradient of f(x).
[in]new_xis false if the previous call to any one of the Evaluation Methods used the same value for x.
[out]grad_fis a vector of size nx_. The input value of its elements does not matter. The output value of its elements is the gradient of f(x) at this value of.
The return value is always true; see Evaluation Methods.

Definition at line 664 of file solve_callback.hpp.