# lowDouble {#lowdouble}

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

## Syntax {#syntax}

`lowDouble(X)`

## Arguments {#arguments}

**X** is a vector/scalar which must be 16-byte data type.

## Details {#details}

It returns the low-order 8-byte double data of *X*.

## Example {#example}

```
x=1 2 3 4
y=4 3 2 1
points = point(x, y)
x1 = lowDouble(points)
// output: [1,2,3,4]
```

Get the real part of the complex number:

```
a=complex(2, 5)
lowDouble(a)
// output: 2
```

