# \#eval-function

**URL:** https://forum.encoord.com/tag/eval-function/136.md

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## [Esum function](https://forum.encoord.com/t/esum-function/327)

<div class="topic-metadata">

**Author:** [@emmacooper](https://forum.encoord.com/u/emmacooper)\
**Replies:** 1\
**Last updated:** [April 24, 2025, 6:50pm UTC](https://forum.encoord.com/t/esum-function/327 "2025-04-24T18:50:44Z")

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I am wondering if it is possible to sum VOM costs over the entire network using the esum function, as one can with fuel costs. For example, esum('ENET.FUELCOSTRATE.(%)') returns a float but esum('ENET.VOMCOSTRATE.(%)') …