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Add more math functions to templates #5186

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Apr 15, 2018
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Add more math functions to templates #5186

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11 changes: 11 additions & 0 deletions source/_docs/configuration/templating.markdown
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Expand Up @@ -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.
Expand Down Expand Up @@ -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 %}
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