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Signed-off-by: Levi Harrison <git@leviharrison.dev>
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Levi Harrison 2021-08-23 20:15:32 -04:00
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docs/querying/functions.md
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@ -434,3 +434,45 @@ over time and return an instant vector with per-series aggregation results:
Note that all values in the specified interval have the same weight in the Note that all values in the specified interval have the same weight in the
aggregation even if the values are not equally spaced throughout the interval. aggregation even if the values are not equally spaced throughout the interval.
## Trigonometric Functions
- `acos(v instant-vector)`: calculates the arccosine, in radians, of all elements in `v`. Special cases are:
- `acos(x) = NaN if x < -1 or x > 1`
- `asin(v instant-vector)`: calculates the arcsine, in radians, of all elements in `v`. Special cases are:
- `asin(±0) = ±0`
- `atan(v instant-vector)`: calculates the arctangent, in radians, of all elements in `v`. Special cases are:
- `atan(±0) = ±0`
- `atan(±Inf) = ±Pi/2`
- `atan2(y, x instant-vector)`: calculates the arctangent of `y`/`x` for all elements, in radians, using the signs of the two to determine the quadrant of the result ([from the package](https://pkg.go.dev/math#Atan2)). Special cases are:
- `atan2(y, NaN) = NaN`
- `atan2(NaN, x) = NaN`
- `atan2(+0, x>=0) = +0`
- `atan2(-0, x>=0) = -0`
- `atan2(+0, x<=-0) = +Pi`
- `atan2(-0, x<=-0) = -Pi`
- `atan2(y>0, 0) = +Pi/2`
- `atan2(y<0, 0) = -Pi/2`
- `atan2(+Inf, +Inf) = +Pi/4`
- `atan2(-Inf, +Inf) = -Pi/4`
- `atan2(+Inf, -Inf) = 3Pi/4`
- `atan2(-Inf, -Inf) = -3Pi/4`
- `atan2(y, +Inf) = 0`
- `atan2(y>0, -Inf) = +Pi`
- `atan2(y<0, -Inf) = -Pi`
- `atan2(+Inf, x) = +Pi/2`
- `atan2(-Inf, x) = -Pi/2`
- `cos(v instant-vector)`: calculates the cosine, in radians, of all elements in `v`. Special cases are:
- `cos(±Inf) = NaN`
- `cos(NaN) = NaN`
- `deg(v instant-vector)`: converts radians to degrees for all elements in `v`.
- `pi()`: returns the first 16 digits of Pi.
- `rad(v instant-vector)`: converts degrees to radians for all elements in `v`.
- `sin(v instant-vector)`: calculates the sine, in radians, of all elements in `v`. Special cases are:
- `sin(±0) = ±0`
- `sin(±Inf) = NaN`
- `Sin(NaN) = NaN`
- `tan(v instant-vector)`: calculates the tangent, in radians, of all elements in `v`. Special cases are:
- `tan(±0) = ±0`
- `tan(±Inf) = NaN`
- `tan(NaN) = NaN`