Added quadratic mean

kvadrik · web-flow · commit f84d4135bcee · 2026-03-14T23:55:10.000+02:00
Added a quadratic mean of the given numbers, sqrt ((n1^2+n2^2+...+nk^2)/k).
diff --git a/src/main/java/com/thealgorithms/maths/Means.java b/src/main/java/com/thealgorithms/maths/Means.java
@@ -107,6 +107,13 @@ public static Double harmonic(final Iterable<Double> numbers) {
         return size / sumOfReciprocals;
     }
 
+    public static Double quadratic(final Iterable<Double> numbers) {
+        checkIfNotEmpty(numbers);
+        double sum = StreamSupport.stream(numbers.spliterator(), false).reduce(0d, (x, y) -> x * x + y * y);
+        int size = IterableUtils.size(numbers);
+        return Math.sqrt(sum / size);
+    }
+    
     /**
      * Validates that the input iterable is not empty.
      *

Original file line number	Diff line number	Diff line change
`@@ -107,6 +107,13 @@ public static Double harmonic(final Iterable<Double> numbers) {`
`107`	`107`	`return size / sumOfReciprocals;`
`108`	`108`	`}`
`109`	`109`
	`110`	`+ public static Double quadratic(final Iterable<Double> numbers) {`
	`111`	`+ checkIfNotEmpty(numbers);`
	`112`	`+ double sum = StreamSupport.stream(numbers.spliterator(), false).reduce(0d, (x, y) -> x * x + y * y);`
	`113`	`+ int size = IterableUtils.size(numbers);`
	`114`	`+ return Math.sqrt(sum / size);`
	`115`	`+ }`
	`116`	`+`
`110`	`117`	`/**`
`111`	`118`	`* Validates that the input iterable is not empty.`
`112`	`119`	`*`