Stan Math Library  2.10.0
reverse mode automatic differentiation
inv_sqrt.hpp
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1 #ifndef STAN_MATH_PRIM_SCAL_FUN_INV_SQRT_HPP
2 #define STAN_MATH_PRIM_SCAL_FUN_INV_SQRT_HPP
3 
4 #include <boost/math/tools/promotion.hpp>
5 
6 namespace stan {
7  namespace math {
8 
9  template <typename T>
10  inline
11  typename boost::math::tools::promote_args<T>::type
12  inv_sqrt(const T x) {
13  using std::sqrt;
14 
15  return 1.0 / sqrt(x);
16  }
17 
18  }
19 }
20 
21 #endif
fvar< T > inv_sqrt(const fvar< T > &x)
Definition: inv_sqrt.hpp:15
fvar< T > sqrt(const fvar< T > &x)
Definition: sqrt.hpp:15

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