Jay created MATH-1431:
-------------------------
Summary: EmpiricalDistribution cumulativeProbability can return
NaN when evaluated within an empty bin.
Key: MATH-1431
URL: https://issues.apache.org/jira/browse/MATH-1431
Project: Commons Math
Issue Type: Bug
Affects Versions: 3.6.1
Reporter: Jay
The NaN can be reproduced by the following program. Evaluating at x = 0.3, it
appeared that getkernel returned a NormalDistribution with mean of NaN and
standardDeviation of NaN.
final int len = 240000;
double[] data = new double[len];
for (int i = 0; i < len / 2; ++i) {
data[i] = 0;
}
for (int i = len / 2 + 1; i < len ; ++i) {
data[i] = 1;
}
int binCnt = Math.max(1, data.length / 10);
EmpiricalDistribution edist = new EmpiricalDistribution(binCnt);
edist.load(data);
double x = 0.3;
double y = edist.cumulativeProbability(x);
System.out.println("y is " + y);
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