Added test to verify that zero variance in either array leads to NaN.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/math/trunk@1540392 13f79535-47bb-0310-9956-ffa450edef68
2013-11-09 20:31:52 +00:00 · 2013-11-09 20:31:52 +00:00 · eca87abcee
parent d252a811a2
commit eca87abcee
1 changed files with 1 additions and 0 deletions
--- a/src/test/java/org/apache/commons/math3/stat/correlation/PearsonsCorrelationTest.java
+++ b/src/test/java/org/apache/commons/math3/stat/correlation/PearsonsCorrelationTest.java
@ -194,6 +194,7 @@ public class PearsonsCorrelationTest {
        double[] noVariance = new double[] {1, 1, 1, 1};
        double[] values = new double[] {1, 2, 3, 4};
        Assert.assertTrue(Double.isNaN(new PearsonsCorrelation().correlation(noVariance, values)));
+        Assert.assertTrue(Double.isNaN(new PearsonsCorrelation().correlation(values, noVariance)));
    }