[commons-statistics] 01/04: Sonar fix: Create double from sum of integers for power function

[aherbert]

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aherbert pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/commons-statistics.git

commit b774694323f271c0deaf10e9848edb575fa8250c
Author: Alex Herbert <aherb...@apache.org>
AuthorDate: Wed Oct 27 12:31:30 2021 +0100

    Sonar fix: Create double from sum of integers for power function
---
 .../org/apache/commons/statistics/distribution/ZipfDistribution.java  | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git 
a/commons-statistics-distribution/src/main/java/org/apache/commons/statistics/distribution/ZipfDistribution.java
 
b/commons-statistics-distribution/src/main/java/org/apache/commons/statistics/distribution/ZipfDistribution.java
index addc503..08d1c3a 100644
--- 
a/commons-statistics-distribution/src/main/java/org/apache/commons/statistics/distribution/ZipfDistribution.java
+++ 
b/commons-statistics-distribution/src/main/java/org/apache/commons/statistics/distribution/ZipfDistribution.java
@@ -143,10 +143,10 @@ public final class ZipfDistribution extends 
AbstractDiscreteDistribution {
         // See http://www.math.wm.edu/~leemis/chart/UDR/PDFs/Zipf.pdf
         // S(x) = P(X > x) = ((x+1)^a Hn,a - (x+1)^a Hx+1,a + 1) / ((x+1)^a 
Hn,a)
         // where a = exponent and Hx,a is the generalized harmonic for x with 
exponent a.
-        final double z = Math.pow(x + 1, exponent);
+        final double z = Math.pow(x + 1.0, exponent);
         // Compute generalizedHarmonic(x, exponent) and 
generalizedHarmonic(x+1, exponent)
         final double hx = generalizedHarmonic(x, exponent);
-        final double hx1 = hx + Math.pow(x + 1, -exponent);
+        final double hx1 = hx + Math.pow(x + 1.0, -exponent);
         // Compute the survival function
         final double p = (z * (nthHarmonic - hx1) + 1) / (z * nthHarmonic);
         // May overflow for large exponent so validate the probability.