1 #ifndef STAN_MATH_FWD_MAT_FUNCTOR_GRADIENT_HPP
2 #define STAN_MATH_FWD_MAT_FUNCTOR_GRADIENT_HPP
42 template <
typename T,
typename F>
45 const Eigen::Matrix<T, Dynamic, 1>& x,
47 Eigen::Matrix<T, Dynamic, 1>& grad_fx) {
48 Eigen::Matrix<fvar<T>, Dynamic, 1> x_fvar(x.size());
49 grad_fx.resize(x.size());
50 for (
int i = 0; i < x.size(); ++i) {
51 for (
int k = 0; k < x.size(); ++k)
52 x_fvar(k) =
fvar<T>(x(k), k == i);
54 if (i == 0) fx = fx_fvar.
val_;
55 grad_fx(i) = fx_fvar.
d_;
void gradient(const F &f, const Eigen::Matrix< T, Dynamic, 1 > &x, T &fx, Eigen::Matrix< T, Dynamic, 1 > &grad_fx)
Calculate the value and the gradient of the specified function at the specified argument.