# Getting the masks for NMF

**URL:** https://discourse.flucoma.org/t/getting-the-masks-for-nmf/682
**Category:** Usage Questions
**Created:** [October 23, 2020, 12:38pm UTC](https://discourse.flucoma.org/t/getting-the-masks-for-nmf/682 "2020-10-23T12:38:38Z")
**Posts on this page:** 1
**Showing post:** 2

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### Author: ![a.harker](https://discourse.flucoma.org/user_avatar/discourse.flucoma.org/a.harker/32/18_2.png) [@a.harker](https://discourse.flucoma.org/u/a.harker)
#### Post date: [October 23, 2020, 12:47pm UTC](https://discourse.flucoma.org/t/getting-the-masks-for-nmf/682/2 "2020-10-23T12:47:11Z")

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OK - brain now engaged:

Mask[t][k] = (Basis[k] \* Activation[t]) / Sum(Bases[c][k] \* Activations[c][k])

where c is the component (t and k more obviously are time and bins) and the summing is for all c.

Is that right?

Also - am I correct that these masks are totally page for other objects like the HPSS? I’m interested in both being able to analyses them, and potentially process and then apply them, but right now it feels like that isn’t very possible with the tools as they are - have I missed something?

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