---
title: dfr set
layout: command
version: 0.59.0
---

Sets value where given mask is true

## Signature

```> dfr set (value) --mask```

## Parameters

 -  `value`: value to be inserted in series
 -  `--mask {any}`: mask indicating insertions

## Examples

Shifts the values by a given period
```shell
> let s = ([1 2 2 3 3] | dfr to-df | dfr shift 2);
    let mask = ($s | dfr is-null);
    $s | dfr set 0 --mask $mask
```