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Verify distribution uniformity/Naive: Difference between revisions
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Line 869:
|Distribution is potentially skewed: assert
| errmsg assert(delta*expected)>|expected-{:"1 freqtable</lang>
=={{header|Java}}==
{{trans|D}}
{{works with|Java|8}}
<lang java>import static java.lang.Math.abs;
import java.util.*;
import java.util.function.IntSupplier;
public class Test {
static void distCheck(IntSupplier f, int nRepeats, double delta) {
Map<Integer, Integer> counts = new HashMap<>();
for (int i = 0; i < nRepeats; i++)
counts.compute(f.getAsInt(), (k, v) -> v == null ? 1 : v + 1);
double target = nRepeats / (double) counts.size();
int deltaCount = (int) (delta / 100.0 * target);
counts.forEach((k, v) -> {
if (abs(target - v) >= deltaCount)
System.out.printf("distribution potentially skewed "
+ "for '%s': '%d'%n", k, v);
});
counts.keySet().stream().sorted().forEach(k
-> System.out.printf("%d %d%n", k, counts.get(k)));
}
public static void main(String[] a) {
distCheck(() -> (int) (Math.random() * 5) + 1, 1_000_000, 1);
}
}</lang>
<pre>1 200439
2 201016
3 199406
4 199869
5 199270</pre>
=={{header|JavaScript}}==
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