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From Gilles Sadowski <gil...@harfang.homelinux.org>
Subject Re: [math] Pearson Correaltion NaNs
Date Tue, 06 Nov 2012 12:17:04 GMT
Hello.

> 
> I am having difficulties using the Pearson Correlation because it
> seems that it does not work if some cell is NaN. Is that intended?

Very likely. [When NaN appears in a computation, it propagates and the
result is NaN.]

> Here is some code:
> 
> public static void main(String[] args) {
>         double [] row1 = new double[]{3,4};
>         double [] row2 = new double[]{1,8};
>         double [] row3 = new double[]{Double.NaN,4};
>         double[][] data = new double[][]{row1,row2,row3};
>         System.out.println(Arrays.deepToString(data));
> 
>         PearsonsCorrelation coefMatrixP = new PearsonsCorrelation(data);
> 
> System.out.println(coefMatrixP.getCorrelationMatrix().toString());
>     }
> 

What would you suggest should happen?


Regards,
Gilles

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