Nushell
Get Nu!
Getting Started
  • The Nushell Book
  • Command Reference
  • Cookbook
  • Language Reference Guide
  • Contributing Guide
Blog
  • English
  • 中文
  • Deutsch
  • Français
  • Español
  • 日本語
  • Português do Brasil
  • Русский язык
GitHub
Get Nu!
Getting Started
  • The Nushell Book
  • Command Reference
  • Cookbook
  • Language Reference Guide
  • Contributing Guide
Blog
  • English
  • 中文
  • Deutsch
  • Français
  • Español
  • 日本語
  • Português do Brasil
  • Русский язык
GitHub
  • Categories

    • Bits
    • Bytes
    • Chart
    • Conversions
    • Core
    • Database
    • Dataframe
    • Dataframe Or Lazyframe
    • Date
    • Debug
    • Default
    • Env
    • Experimental
    • Expression
    • Filesystem
    • Filters
    • Formats
    • Generators
    • Hash
    • History
    • Lazyframe
    • Math
    • Misc
    • Network
    • Path
    • Platform
    • Plugin
    • Prompt
    • Random
    • Removed
    • Shells
    • Strings
    • System
    • Viewers

polars is-null for dataframe

Creates mask where value is null.

This command requires a plugin

The polars is-null command resides in the polars plugin. To use this command, you must install and register nu_plugin_polars. See the Plugins chapter in the book for more information.

Signature

> polars is-null {flags}

Input/output types:

inputoutput
anyany

Examples

Create mask where values are null

> let s = ([5 6 0 8] | polars into-df);
    let res = ($s / $s);
    $res | polars is-null
╭───┬─────────╮
│ # │ is_null │
├───┼─────────┤
│ 0 │ false   │
│ 1 │ false   │
│ 2 │ true    │
│ 3 │ false   │
╰───┴─────────╯

Creates a is null expression from a column

> polars col a | polars is-null