# BLL Math js expression

**URL:** <https://community.homey.app/t/bll-math-js-expression/140429>\
**Category:** 🇳🇱 Nederlands (Dutch)\
**Created:** [July 26, 2025, 12:15pm UTC](https://community.homey.app/t/bll-math-js-expression/140429 "2025-07-26T12:15:39Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Henny\_Karreman](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/henny_karreman/32/9581_2.png) [@Henny\_Karreman](https://community.homey.app/u/Henny_Karreman)\
**Post date:** [July 26, 2025, 12:15pm UTC](https://community.homey.app/t/bll-math-js-expression/140429/1 "2025-07-26T12:15:39Z")

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Ik zie regelmatig voorbeelden van BLL waarin Execute Mathjs Expression wordt gebruikt .  
Ik zie deze optie niet als ik een BLL kaart wil gebruiken.  
Moet ik nog iets installeren ?

 ![IMG_0373.HEIC](https://us1.discourse-cdn.com/flex025/uploads/athom/original/3X/5/a/5adeeae4aa840d94823fa2fe301f6ad33223d22b.jpeg)

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<div class="post-metadata">

**Author:** ![Peter\_Kawa](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/peter_kawa/32/173848_2.png) [@Peter\_Kawa](https://community.homey.app/u/Peter_Kawa)\
**Post date:** [July 26, 2025, 12:28pm UTC](https://community.homey.app/t/bll-math-js-expression/140429/2 "2025-07-26T12:28:41Z")

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Niet dat ik weet.

Ik heb je getoonde kaart ook niet trouwens, _wel “set [variabele] to [mathjs expression]”_

 ![Screenshot_20250726_142651_Firefox](https://us1.discourse-cdn.com/flex025/uploads/athom/original/3X/b/5/b5ed8e9f606f1e4cc32f06dcfe80f0d944ae3bed.jpeg)  
 ![Screenshot_20250726_142707_Firefox](https://us1.discourse-cdn.com/flex025/uploads/athom/original/3X/5/d/5d43b67dd81ff7f688c03448562d9c57ba6809d5.jpeg)