# Circadian rhythm function

**URL:** <https://forum.certara.com/t/circadian-rhythm-function/2606>\
**Category:** Modelling and Simulation\
**Created:** [July 26, 2013, 1:06pm UTC](https://forum.certara.com/t/circadian-rhythm-function/2606 "2013-07-26T13:06:01Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![teresaacollins](https://avatars.discourse-cdn.com/v4/letter/t/977dab/32.png) [@teresaacollins](https://forum.certara.com/u/teresaacollins)\
**Post date:** [July 26, 2013, 1:06pm UTC](https://forum.certara.com/t/circadian-rhythm-function/2606/1 "2013-07-26T13:06:01Z")

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Hi all, I want to know how to code for a cosine function in PML, has anyone attempted this? Many Thanks Teresa

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**Author:** ![minhaj](https://avatars.discourse-cdn.com/v4/letter/m/a698b9/32.png) [@minhaj](https://forum.certara.com/u/minhaj)\
**Post date:** [July 26, 2013, 5:33pm UTC](https://forum.certara.com/t/circadian-rhythm-function/2606/2 "2013-07-26T17:33:50Z")

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cos(value in radian) for example cos(22/7) will return -1 . best regards; Serge