log10() [8/9]

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

auto stan::math::log10 ( const var_value< T > &  a )

inline

Return the base 10 log of the specified variable (cmath).

The derivative is defined by

$\frac{d}{dx} \log_{10} x = \frac{1}{x \log 10}$.

$$\mbox{log10}(x) = \begin{cases} \textrm{NaN} & \mbox{if } x < 0\\ \log_{10}(x) & \mbox{if } x \geq 0 \\[6pt] \textrm{NaN} & \mbox{if } x = \textrm{NaN} \end{cases}$$

$$\frac{\partial\, \mbox{log10}(x)}{\partial x} = \begin{cases} \textrm{NaN} & \mbox{if } x < 0\\ \frac{1}{x \ln10} & \mbox{if } x\geq 0 \\[6pt] \textrm{NaN} & \mbox{if } x = \textrm{NaN} \end{cases}$$

Template Parameters

T	Arithmetic or a type inheriting from EigenBase.

Parameters

a	Variable whose log is taken.

Returns

Base 10 log of variable.

Definition at line 48 of file log10.hpp.