Summary  
The chapter explains how to filter an array by creating a boolean mask through logical comparisons and using it to extract only those elements that meet the condition, with an optional fallback if no items qualify.

General domain of usage  
Spreadsheet data filtering

The **FILTER** function in **Excel** is designed to filter a range of data based on specified criteria and return the matching values. This function is highly useful for data analysis, reporting, and data management tasks.

Definition

You have to provide a range you want to filter. The next parameter, as specified above, is a **boolean array**, but where can we find it? A **boolean array** is simply a range of `True` or `False` values. You can take any range and turn it into a **boolean array** with an array formula.

What you’re doing here is applying a **condition** to a range of values using operators like `>`, `<`, or `=`. For example, suppose you have a list of product names in **column A** and their **sales figures in column B**. You want to filter out only the products with **sales greater than 250**.

First, select **column A** (product names). Then, create a **boolean array** to identify which products meet the condition. You can do this separately or **integrate it directly** into your formula.

If no products have a count greater than the specified threshold, you will get a `#CALC!` error. To prevent this, you can specify a third parameter in the formula that will be displayed if there is no match.

Note

What happens if no entries meet the criteria specified in the `FILTER` function and the `if_empty` argument is omitted?

Unlock the full potential of Excel by learning how to use formulas and functions to simplify tasks, analyze data, and work more efficiently. You'll explore everything from basic arithmetic and conditional logic to dynamic arrays and powerful lookup tools like VLOOKUP, MATCH, and INDIRECT. With practical examples and clear explanations, you'll build a solid foundation and discover smarter ways to manage and manipulate your spreadsheets.

Learn how to enter and use Excel formulas for calculations, including basic operations like addition, subtraction, multiplication, division, and exponentiation. Understand the importance of using functions to make your formulas clearer and more efficient.

Learn array formulas in Excel and how they enable multiple calculations on sets of values simultaneously. Explore how to use specific functions like UNIQUE, SORT, FILTER, and TRANSPOSE.

In this section, you will learn about lookup and reference formulas in Excel. These formulas enable you to search for and retrieve specific data from a table or range. You will explore essential functions such as VLOOKUP, HLOOKUP, MATCH, INDEX, and XLOOKUP, which are invaluable for finding and referencing data efficiently.

FILTER Formula in Excel

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FILTER Formula in Excel