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Add more math functions to templates (#5186)

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Document usage of `sin`, `cos`, `tan`, and `sqrt`, and the `e`, `pi`,
and `tau` constants.
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Benedict Aas 2018-04-15 17:52:21 +01:00 committed by Fabian Affolter
parent 36a385b5b7
commit ce53c0e9f0
1 changed files with 11 additions and 0 deletions
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source/_docs/configuration/templating.markdown
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@ -80,6 +80,13 @@ Home Assistant adds extensions to allow templates to access all of the current s
- `float` will format the output as float.
- `strptime(string, format)` will parse a string to a datetime based on a [format][strp-format].
- `log(value, base)` will take the logarithm of the input. When the base is omitted, it defaults to `e` - the natural logarithm. Can also be used as a filter.
- `sin(value)` will return the sine of the input. Can be used as a filter.
- `cos(value)` will return the cosine of the input. Can be used as a filter.
- `tan(value)` will return the tangent of the input. Can be used as a filter.
- `sqrt(value)` will return the square root of the input. Can be used as a filter.
- `e` mathematical constant, approximately 2.71828.
- `pi` mathematical constant, approximately 3.14159.
- `tau` mathematical constant, approximately 6.28318.
- Filter `round(x)` will convert the input to a number and round it to `x` decimals.
- Filter `timestamp_local` will convert an UNIX timestamp to local time/data.
- Filter `timestamp_utc` will convert an UNIX timestamp to UTC time/data.
@ -274,6 +281,10 @@ The following overview contains a couple of options to get the needed values:
{% raw %}{{ float(value_json) * (2**10) }}{% endraw %}
{% raw %}{{ value_json | log }}{% endraw %}
{% raw %}{{ log(1000, 10) }}{% endraw %}
{% raw %}{{ sin(pi / 2) }}{% endraw %}
{% raw %}{{ cos(tau) }}{% endraw %}
{% raw %}{{ tan(pi) }}{% endraw %}
{% raw %}{{ sqrt(e) }}{% endraw %}
# Timestamps
{% raw %}{{ value_json.tst | timestamp_local }}{% endraw %}