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Fix comment

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Alexey Milovidov 2021-09-12 09:09:57 +03:00
parent 53f4d10d8c
commit 6802010c9f
1 changed files with 1 additions and 1 deletions
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src/Common/ExponentiallySmoothedCounter.h
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@ -11,7 +11,7 @@ namespace DB
* *
* Exponentially smoothed average over time is weighted average with weight proportional to negative exponent of the time passed. * Exponentially smoothed average over time is weighted average with weight proportional to negative exponent of the time passed.
* For example, the last value is taken with weight 1/2, the value one second ago with weight 1/4, two seconds ago - 1/8, etc. * For example, the last value is taken with weight 1/2, the value one second ago with weight 1/4, two seconds ago - 1/8, etc.
* It can be understand as an average over sliding window, but with different kernel. * It can be understood as an average over sliding window, but with different kernel.
* *
* As an advantage, it is easy to update. Instead of collecting values and calculating a series of x1/2 + x2/4 + x3/8... * As an advantage, it is easy to update. Instead of collecting values and calculating a series of x1/2 + x2/4 + x3/8...
* just calculate x_old * weight + x_new * (1 - weight), where weight is and exponent of time passed. * just calculate x_old * weight + x_new * (1 - weight), where weight is and exponent of time passed.