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fix for NaN occurring with small values

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This commit is contained in:
Mark Wolters 2023-12-22 13:20:26 -04:00
parent 080849ba3d
commit af5955e108
1 changed files with 3 additions and 1 deletions
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4
nbr/src/main/java/io/nosqlbench/scenarios/simframe/stabilization/StatBucket.java
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@ -51,8 +51,10 @@ public final class StatBucket {
} else {
var meanIncrement = (value - popped) / ringbuf.count();
var newMean = mean + meanIncrement;
var dSquaredIncrement = ((value - popped) * (value - newMean + popped - mean));
// If this value is too small to be interpreted as a double it gets converted to
// zero, which is not what we want. So we use the smallest possible double value
if (dSquaredIncrement == 0) dSquaredIncrement = Double.MIN_VALUE;
var newDSquared = this.dSquared + dSquaredIncrement;
mean = newMean;
dSquared = newDSquared;