log1p() [7/7]

template<typename T , require_stan_scalar_or_eigen_t< T > * = nullptr>

auto stan::math::log1p ( const var_value< T > &  a )

inline

The log (1 + x) function for variables (C99).

The derivative is given by

\(\frac{d}{dx} \log (1 + x) = \frac{1}{1 + x}\).

Template Parameters

T	Arithmetic or a type inheriting from EigenBase.

Parameters

a	The variable.

Returns

The log of 1 plus the variable.

Definition at line 23 of file log1p.hpp.