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partial_derivative.hpp
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1 #ifndef STAN_MATH_MIX_MAT_FUNCTOR_PARTIAL_DERIVATIVE_HPP
2 #define STAN_MATH_MIX_MAT_FUNCTOR_PARTIAL_DERIVATIVE_HPP
3 
4 #include <stan/math/fwd/core.hpp>
6 #include <stan/math/rev/core.hpp>
7 #include <vector>
8 
9 namespace stan {
10 
11  namespace math {
12 
13  using Eigen::Dynamic;
14 
27  template <typename T, typename F>
28  void
29  partial_derivative(const F& f,
30  const Eigen::Matrix<T, Dynamic, 1>& x,
31  int n,
32  T& fx,
33  T& dfx_dxn) {
34  Eigen::Matrix<fvar<T>, Dynamic, 1> x_fvar(x.size());
35  for (int i = 0; i < x.size(); ++i)
36  x_fvar(i) = fvar<T>(x(i), i == n);
37  fvar<T> fx_fvar = f(x_fvar);
38  fx = fx_fvar.val_;
39  dfx_dxn = fx_fvar.d_;
40  }
41 
42  } // namespace math
43 } // namespace stan
44 #endif
void partial_derivative(const F &f, const Eigen::Matrix< T, Dynamic, 1 > &x, int n, T &fx, T &dfx_dxn)
Return the partial derivative of the specified multiivariate function at the specified argument...

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