[commons-statistics] 06/08: Use static methods if possible

[aherbert]

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

commit 35bda464bb4cf3353586c17497e46b3f11c1ab94
Author: aherbert <aherb...@apache.org>
AuthorDate: Mon Feb 22 13:46:46 2021 +0000

    Use static methods if possible
---
 .../commons/statistics/distribution/HypergeometricDistribution.java | 6 +++---
 .../apache/commons/statistics/distribution/ZipfDistribution.java    | 2 +-
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git 
a/commons-statistics-distribution/src/main/java/org/apache/commons/statistics/distribution/HypergeometricDistribution.java
 
b/commons-statistics-distribution/src/main/java/org/apache/commons/statistics/distribution/HypergeometricDistribution.java
index 22b8895..cdeab67 100644
--- 
a/commons-statistics-distribution/src/main/java/org/apache/commons/statistics/distribution/HypergeometricDistribution.java
+++ 
b/commons-statistics-distribution/src/main/java/org/apache/commons/statistics/distribution/HypergeometricDistribution.java
@@ -94,7 +94,7 @@ public class HypergeometricDistribution extends 
AbstractDiscreteDistribution {
      * @return a two element array containing the lower and upper bounds of the
      * hypergeometric distribution.
      */
-    private int[] getDomain(int n, int m, int k) {
+    private static int[] getDomain(int n, int m, int k) {
         return new int[] {getLowerDomain(n, m, k), getUpperDomain(m, k)};
     }
 
@@ -107,7 +107,7 @@ public class HypergeometricDistribution extends 
AbstractDiscreteDistribution {
      * @param k Sample size.
      * @return the lowest domain value of the hypergeometric distribution.
      */
-    private int getLowerDomain(int n, int m, int k) {
+    private static int getLowerDomain(int n, int m, int k) {
         return Math.max(0, m - (n - k));
     }
 
@@ -146,7 +146,7 @@ public class HypergeometricDistribution extends 
AbstractDiscreteDistribution {
      * @param k Sample size.
      * @return the highest domain value of the hypergeometric distribution.
      */
-    private int getUpperDomain(int m, int k) {
+    private static int getUpperDomain(int m, int k) {
         return Math.min(k, m);
     }
 
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 c104438..389feb3 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
@@ -171,7 +171,7 @@ public class ZipfDistribution extends 
AbstractDiscreteDistribution {
      * @param m Exponent (special case {@code m = 1} is the harmonic series).
      * @return the n<sup>th</sup> generalized harmonic number.
      */
-    private double generalizedHarmonic(final int n, final double m) {
+    private static double generalizedHarmonic(final int n, final double m) {
         double value = 0;
         for (int k = n; k > 0; --k) {
             value += 1 / Math.pow(k, m);