log1p() [4/7]

double stan::math::log1p ( double  x )

inline

Return the natural logarithm of one plus the specified value.

\[ \mbox{log1p}(x) = \log(1 + x) \]

This version is more stable for arguments near zero than the direct definition. If x == -1, log1p(x) is defined to be negative infinity.

Parameters

[in]

x

Argument.

Returns

Natural log of one plus the argument.

Exceptions

std::domain_error

If argument is less than -1.

Definition at line 29 of file log1p.hpp.