# Function im Get the imaginary part of a complex number. For a complex number `a + bi`, the function returns `b`. For matrices, the function is evaluated element wise. ## Syntax ```js math.im(x) ``` ### Parameters Parameter | Type | Description --------- | ---- | ----------- `x` | number | BigNumber | Complex | Array | Matrix | A complex number or array with complex numbers ### Returns Type | Description ---- | ----------- number | BigNumber | Array | Matrix | The imaginary part of x ## Examples ```js const a = math.complex(2, 3) math.re(a) // returns number 2 math.im(a) // returns number 3 math.re(math.complex('-5.2i')) // returns number -5.2 math.re(math.complex(2.4)) // returns number 0 ``` ## See also [re](re.md), [conj](conj.md), [abs](abs.md), [arg](arg.md)