# NOT
URL: https://docs.valsight.ai/not/
Description: Inverts the input values with the logical NOT operation. If the input is true (non-zero), false (0) is returned, and true (1) otherwise. Use when you want to invert an existing logical condition so true becomes false and false becomes true.
**Category:** [Logical functions](/logical-functions/)

## Overview

The **NOT** function **inverts the input values with the logical NOT operation**. If the input is true (non-zero), false (0) is returned, and true (1) otherwise.

Use this function when you want to invert an existing logical condition so true becomes false and false becomes true.

## Syntax

`NOT('Node')`

## Parameters

| Parameter | Description                                                                   | Type           | Required |
| --------- | ----------------------------------------------------------------------------- | -------------- | -------- |
| **Node**  | Input node, specified using the node name in single quotes (e.g. `'Profit'`). | Node reference | Yes      |

## Example

### Typical use

This example shows that `NOT` turns non-zero values into 0 and turns 0 into 1.

**Input node:** `'A'`

| Year | Value |
| ---- | ----- |
| 2025 | 400   |
| 2026 | 0     |
| 2027 | 850   |
| 2028 | 500   |

**Formula:** `NOT('A')`

| Year | NOT Result |
| ---- | ---------- |
| 2025 | 0          |
| 2026 | 1          |
| 2027 | 0          |
| 2028 | 0          |

## Related Functions

| Function          | When to use instead                                                                      |
| ----------------- | ---------------------------------------------------------------------------------------- |
| [TRUE](/true/)    | When you need a constant true condition instead of inverting an existing logical result. |
| [IS\_NA](/is-na/) | When you want to detect undefined values instead of inverting true and false results.    |