logb()

template<typename T , typename = require_autodiff_t<T>>

double stan::math::logb

(

const T &

x

)

Returns the value of the unbiased radix-independent exponent from the floating-point argument.

Implementation note: This implementation works for all autodiff types because it is a step function, so can return a double which will produce the correct zero derivative if promoted to an autodiff variable.

Template Parameters

T	floating-point type

Parameters

[in]

x

floating-point argument

Returns

unbiased radix-independent exponent of the argument

Definition at line 24 of file logb.hpp.