operator*() [14/20]

var stan::math::operator* ( const var &  a, const var &  b  )

inline

Multiplication operator for two variables (C++).

The partial derivatives are

$\frac{\partial}{\partial x} (x * y) = y$, and

$\frac{\partial}{\partial y} (x * y) = x$.

$$\mbox{operator*}(x, y) = \begin{cases} xy & \mbox{if } -\infty\leq x, y \leq \infty \\[6pt] \textrm{NaN} & \mbox{if } x = \textrm{NaN or } y = \textrm{NaN} \end{cases}$$

$$\frac{\partial\, \mbox{operator*}(x, y)}{\partial x} = \begin{cases} y & \mbox{if } -\infty\leq x, y \leq \infty \\[6pt] \textrm{NaN} & \mbox{if } x = \textrm{NaN or } y = \textrm{NaN} \end{cases}$$

$$\frac{\partial\, \mbox{operator*}(x, y)}{\partial y} = \begin{cases} x & \mbox{if } -\infty\leq x, y \leq \infty \\[6pt] \textrm{NaN} & \mbox{if } x = \textrm{NaN or } y = \textrm{NaN} \end{cases}$$

Parameters

a	First variable operand.
b	Second variable operand.

Returns

Variable result of multiplying operands.

Definition at line 76 of file operator_multiplication.hpp.