Copilot commented on code in PR #673:
URL: https://github.com/apache/datasketches-java/pull/673#discussion_r2205908917
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src/main/java/org/apache/datasketches/tdigest/TDigestDouble.java:
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@@ -246,40 +247,41 @@ public double getQuantile(final double rank) {
// at least 2 centroids
final double weight = rank * centroidsWeight_;
if (weight < 1) { return minValue_; }
- if (weight > centroidsWeight_ - 1.0) { return maxValue_; }
+ if (weight > (centroidsWeight_ - 1.0)) { return maxValue_; }
final double firstWeight = centroidWeights_[0];
- if (firstWeight > 1 && weight < firstWeight / 2.0) {
- return minValue_ + (weight - 1.0) / (firstWeight / 2.0 - 1.0) *
(centroidMeans_[0] - minValue_);
+ if ((firstWeight > 1) && (weight < (firstWeight / 2.0))) {
+ return minValue_ + (((weight - 1.0) / ((firstWeight / 2.0) - 1.0)) *
(centroidMeans_[0] - minValue_));
}
final double lastWeight = centroidWeights_[numCentroids_ - 1];
- if (lastWeight > 1 && centroidsWeight_ - weight <= lastWeight / 2.0) {
- return maxValue_ + (centroidsWeight_ - weight - 1.0) / (lastWeight / 2.0
- 1.0) * (maxValue_ - centroidMeans_[numCentroids_ - 1]);
+ if ((lastWeight > 1) && ((centroidsWeight_ - weight) <= (lastWeight /
2.0))) {
+ return maxValue_ + (((centroidsWeight_ - weight - 1.0) / ((lastWeight /
2.0) - 1.0))
+ * (maxValue_ - centroidMeans_[numCentroids_ - 1]));
}
// interpolate between extremes
double weightSoFar = firstWeight / 2.0;
- for (int i = 0; i < numCentroids_ - 1; i++) {
+ for (int i = 0; i < (numCentroids_ - 1); i++) {
final double dw = (centroidWeights_[i] + centroidWeights_[i + 1]) / 2.0;
- if (weightSoFar + dw > weight) {
+ if ((weightSoFar + dw) > weight) {
// the target weight is between centroids i and i+1
double leftWeight = 0;
if (centroidWeights_[i] == 1) {
- if (weight - weightSoFar < 0.5) { return centroidMeans_[i]; }
+ if ((weight - weightSoFar) < 0.5) { return centroidMeans_[i]; }
leftWeight = 0.5;
}
double rightWeight = 0;
if (centroidWeights_[i + 1] == 1) {
- if (weightSoFar + dw - weight <= 0.5) { return centroidMeans_[i +
1]; }
+ if (((weightSoFar + dw) - weight) <= 0.5) { return centroidMeans_[i
+ 1]; }
rightWeight = 0.5;
}
final double w1 = weight - weightSoFar - leftWeight;
- final double w2 = weightSoFar + dw - weight - rightWeight;
+ final double w2 = (weightSoFar + dw) - weight - rightWeight;
return weightedAverage(centroidMeans_[i], w1, centroidMeans_[i + 1],
w2);
}
weightSoFar += dw;
}
- final double w1 = weight - centroidsWeight_ -
centroidWeights_[numCentroids_ - 1] / 2.0;
- final double w2 = centroidWeights_[numCentroids_ - 1] / 2.0 - w1;
+ final double w1 = weight - centroidsWeight_ -
(centroidWeights_[numCentroids_ - 1] / 2.0);
+ final double w2 = (centroidWeights_[numCentroids_ - 1] / 2.0) - w1;
return weightedAverage(centroidWeights_[numCentroids_ - 1], w1, maxValue_,
w2);
Review Comment:
The first argument to weightedAverage should be the last centroid mean
(centroidMeans_) rather than the centroid weight. Using the weight here will
produce incorrect quantile values.
```suggestion
return weightedAverage(centroidMeans_[numCentroids_ - 1], w1, maxValue_,
w2);
```
##########
src/main/java/org/apache/datasketches/tdigest/TDigestDouble.java:
##########
@@ -99,7 +100,7 @@ public short getK() {
*/
public void update(final double value) {
if (Double.isNaN(value)) { return; }
- if (numBuffered_ == centroidsCapacity_ * BUFFER_MULTIPLIER) { compress(); }
+ if (numBuffered_ == (centroidsCapacity_ * BUFFER_MULTIPLIER)) {
compress(); }
Review Comment:
[nitpick] The parentheses around the multiplication are redundant. Consider
simplifying to `if (numBuffered_ == centroidsCapacity_ * BUFFER_MULTIPLIER) {
compress(); }` for improved readability.
```suggestion
if (numBuffered_ == centroidsCapacity_ * BUFFER_MULTIPLIER) {
compress(); }
```
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