---
title: "frob | JavaScript maps SDK"
description: "Documentation for MapTiler SDK"
---

> For AI agents: a documentation index is available at [/llms.txt](https://docs.maptiler.com/llms.txt). Markdown versions of all pages are available by appending .md to any URL.

# Function frob

-   frob(a: [ReadonlyMat4](https://docs.maptiler.com/sdk-js/api-reference/types/Externals.ReadonlyMat4/)): number[](#frob)
    
    Returns Frobenius norm of a mat4
    
    #### Parameters
    
    -   a: [ReadonlyMat4](https://docs.maptiler.com/sdk-js/api-reference/types/Externals.ReadonlyMat4/)
        
        the matrix to calculate Frobenius norm of
        
    
    #### Returns number
    
    Frobenius norm