exp2() [5/6]

var stan::math::exp2 ( const var &  a )

inline

Exponentiation base 2 function for variables (C99).

The derivative is

$\frac{d}{dx} 2^x = (\log 2) 2^x$.

$$\mbox{exp2}(x) = \begin{cases} 2^x & \mbox{if } -\infty\leq x \leq \infty \\[6pt] \textrm{NaN} & \mbox{if } x = \textrm{NaN} \end{cases}$$

$$\frac{\partial\, \mbox{exp2}(x)}{\partial x} = \begin{cases} 2^x\ln2 & \mbox{if } -\infty\leq x\leq \infty \\[6pt] \textrm{NaN} & \mbox{if } x = \textrm{NaN} \end{cases}$$

Parameters

a	The variable.

Returns

Two to the power of the specified variable.

Definition at line 39 of file exp2.hpp.