mathjs/docs/reference/functions/floor.md

Math.js is an extensive math library for JavaScript and Node.js. It features a flexible expression parser and offers an integrated solution to work with numbers, big numbers, complex numbers, units, and matrices.

# Function floor

Round a value towards minus infinity.
For matrices, the function is evaluated element wise.


## Syntax

```js
math.floor(x)
```

### Parameters

Parameter | Type | Description
--------- | ---- | -----------
`x` | Number | BigNumber | Boolean | Complex | Array | Matrix | null | Number to be rounded

### Returns

Type | Description
---- | -----------
Number | BigNumber | Complex | Array | Matrix | Rounded value


## Examples

```js
math.floor(3.2);              // returns Number 3
math.floor(3.8);              // returns Number 3
math.floor(-4.2);             // returns Number -5
math.floor(-4.7);             // returns Number -5

var c = math.complex(3.2, -2.7);
math.floor(c);                // returns Complex 3 - 3i

math.floor([3.2, 3.8, -4.7]); // returns Array [3, 3, -5]
```


## See also

[ceil](ceil.md),
[fix](fix.md),
[round](round.md)


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