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Add arcus trigonometry functions to templates #25510

merged 1 commit into from Aug 9, 2019


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commented Jul 27, 2019


This PR adds arcus trigonometry functions asin, acos, atan and atan2 to template functions.

Atan function is required for example to calculate wet bulb temperature, which more closely describes how temperature feels, from (dry bulb) temperature and relative humidity.

For more info about wet bulb temperature:

Related issue (if applicable):

Pull request with documentation for (if applicable): home-assistant/

Example entry for configuration.yaml (if applicable):


  • The code change is tested and works locally.
  • Local tests pass with tox. Your PR cannot be merged unless tests pass
  • There is no commented out code in this PR.
  • I have followed the development checklist

If user exposed functionality or configuration variables are added/changed:

If the code communicates with devices, web services, or third-party tools:

  • The manifest file has all fields filled out correctly. Update and include derived files by running python3 -m script.hassfest.
  • New or updated dependencies have been added to requirements_all.txt by running python3 -m script.gen_requirements_all.
  • Untested files have been added to .coveragerc.

If the code does not interact with devices:

  • Tests have been added to verify that the new code works.

@tomilehto tomilehto requested a review from home-assistant/core as a code owner Jul 27, 2019

@project-bot project-bot bot added this to Needs review in Dev Jul 27, 2019

@tomilehto tomilehto force-pushed the tomilehto:arc-trigonometry branch from 271b80e to ab1b41e Jul 27, 2019


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commented Jul 27, 2019

Hi @tomilehto,

It seems you haven't yet signed a CLA. Please do so here.

Once you do that we will be able to review and accept this pull request.


@tomilehto tomilehto force-pushed the tomilehto:arc-trigonometry branch from ab1b41e to 3529249 Aug 2, 2019


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commented Aug 2, 2019

Rebased and run black

Dev automation moved this from Needs review to Reviewer approved Aug 9, 2019

balloob approved these changes Aug 9, 2019

@balloob balloob merged commit 5b516fc into home-assistant:dev Aug 9, 2019

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Dev automation moved this from Reviewer approved to Done Aug 9, 2019

@tomilehto tomilehto deleted the tomilehto:arc-trigonometry branch Aug 9, 2019

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