yytInHfut commented on issue #395:
URL:
https://github.com/apache/datasketches-cpp/issues/395#issuecomment-1754218186
Thanks for your reply.
The Java code and results:
```java
final static int commonSizes = 50000;
final static double[] DUM = new double[] {0};
public static void main(String[] args) {
for (int j = 0; j < 10; j++) {
ArrayOfDoublesUpdatableSketch sketchA = new
ArrayOfDoublesUpdatableSketchBuilder().setNominalEntries(1<<14).build();
for (int i = 0; i < 2 * commonSizes; i++) {
sketchA.update(i , DUM);
}
ArrayOfDoublesUpdatableSketch sketchB = new
ArrayOfDoublesUpdatableSketchBuilder().setNominalEntries(1<<14).build();
for (int i = commonSizes; i < 3 * commonSizes; i++) {
sketchB.update(i, DUM);
}
System.out.println(sketchA);
ArrayOfDoublesCompactSketch skA = sketchA.compact();
ArrayOfDoublesCompactSketch skB = sketchB.compact();
ArrayOfDoublesSetOperationBuilder builder = new
ArrayOfDoublesSetOperationBuilder();
ArrayOfDoublesIntersection intersection =
builder.buildIntersection();
long start = System.currentTimeMillis();
intersection.intersect(skA, (a, b) -> a);
intersection.intersect(skB, (a, b) -> a);
ArrayOfDoublesCompactSketch result = intersection.getResult();
System.out.println("iteration: " + j);
System.out.println("common_size: " + commonSizes);
System.out.println("run time: " + (System.currentTimeMillis() -
start) + "ms");
System.out.println("Intersection unique count estimate: " +
result.getEstimate());
System.out.println("Intersection unique count estimate lower
bound 95% confidence: " + result.getLowerBound(2));
System.out.println("Intersection unique count estimate upper
bound 95% confidence: " + result.getUpperBound(2));
System.out.println();
}
}
```
Outputs:
```
iteration: 9
common_size: 50000
run time: 2ms
Intersection unique count estimate: 49500.199335479825
Intersection unique count estimate lower bound 95% confidence:
48801.65021039344
Intersection unique count estimate upper bound 95% confidence:
50208.70802304575
```
```
iteration: 9
common_size: 500000
run time: 1ms
Intersection unique count estimate: 501314.8477448015
Intersection unique count estimate lower bound 95% confidence:
492069.85049213597
Intersection unique count estimate upper bound 95% confidence:
510733.10167792573
```
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