# atan {#atan}

**Parent topic:**[Functions](../../Functions/category.md)

## Syntax {#syntax}

`atan(X)`

## Arguments {#arguments}

**X** is a scalar/vector/matrix/table.

## Details {#details}

The inverse tangent \(arctan\) function.

## Examples {#examples}

```
atan 0.000000 1.557408 -2.185040;
// output: [0,1,-1.141593]
```

Related functions: [asin](asin.md), [acos](acos.md), [sin](../s/sin.md), [cos](../c/cos.md), [tan](../t/tan.md), [asinh](asinh.md), [acosh](acosh.md), [atanh](atanh.md), [sinh](../s/sinh.md), [cosh](../c/cosh.md), [tanh](../t/tanh.md)

