# 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 | Boolean | null |  A complex number or array with complex numbers

### Returns

Type | Description
---- | -----------
Number | BigNumber | Array | Matrix | The imaginary part of x


## Examples

```js
var 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)


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