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我正在计算两个数组的相关性。Commons Maths:Pearsons Correlation会返回NaN。
x = {1,2,3};
y = {1,1,1};
从apache commons数学的PearsonsCorrelation是返回这些数组的NaN。即
PearsonsCorrelation corr = new PearsonsCorrelation();
double result = corr.correlation(x, y); //result = NaN.
为什么不是答案0.0?