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51 lines
1.3 KiB
Markdown
51 lines
1.3 KiB
Markdown
# Function round
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Round a value towards the nearest integer. When `n` is specified, the value is rounded to `n` decimals. If `x` is complex, both real and imaginary part are rounded towards the nearest integer. For matrices, the function is evaluated element wise.
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## Syntax
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```js
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math.round(x)
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math.round(x, n)
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```
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### Parameters
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Parameter | Type | Description
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--------- | ---- | -----------
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`x` | Number | BigNumber | Boolean | Complex | Array | Matrix | Number to be rounded
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`n` | Number | BigNumber | Boolean | Array | Number of decimals. Optional, 0 by default.
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### Returns
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Type | Description
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---- | -----------
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Number | BigNumber | Complex | Array | Matrix | Rounded value
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## Examples
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```js
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var math = mathjs();
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math.round(3.2); // returns Number 3
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math.round(3.8); // returns Number 4
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math.round(-4.2); // returns Number -4
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math.round(-4.7); // returns Number -5
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math.round(math.pi, 3); // returns Number 3.14
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math.round(123.45678, 2); // returns Number 123.46
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var c = math.complex(3.2, -2.7);
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math.round(c); // returns Complex 3 - 3i
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math.round([3.2, 3.8, -4.7]); // returns Array [3, 4, -5]
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```
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## See also
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[ceil](ceil.md),
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[floor](floor.md),
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[fix](fix.md)
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