trend
Input Stack:
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⇨ | Output Stack:
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Warning
Deprecated: Use :rolling-mean instead.
Computes a moving average over the input window. Until there is at least one sample
for the whole window it will emit NaN. If the input line has NaN values, then they
will be treated as zeros. Example:
| Input | 2m,:trend | 5m,:trend |
|---|---|---|
| 0 | NaN | NaN |
| 1 | 0.5 | NaN |
| -1 | 0.0 | NaN |
| NaN | -0.5 | NaN |
| 0 | 0.0 | 0.0 |
| 1 | 0.5 | 0.2 |
| 2 | 1.5 | 0.4 |
| 1 | 1.5 | 0.8 |
| 1 | 1.0 | 1.0 |
| 0 | 0.5 | 1.0 |
The window size is specified as a range of time. If the window size is not evenly divisible by the step size, then the window size will be rounded down. So a 5m window with a 2m step would result in a 4m window with two datapoints per average. A step size larger than the window will result in the trend being a no-op.
Examples:
| 5 Minutes | 20 Minutes |
 |  |
:random, PT5M,:trend | :random, 20m,:trend |