From eeb0661f0671c3ff2c4fb9ce8da14d12ff788ef2 Mon Sep 17 00:00:00 2001
From: Christian Mollekopf <chrigi_1@fastmail.fm>
Date: Mon, 16 Oct 2017 09:42:48 +0200
Subject: Share variance/maxDifference implementation

---
 tests/utils.cpp | 38 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)
 create mode 100644 tests/utils.cpp

(limited to 'tests/utils.cpp')

diff --git a/tests/utils.cpp b/tests/utils.cpp
new file mode 100644
index 0000000..dfaab17
--- /dev/null
+++ b/tests/utils.cpp
@@ -0,0 +1,38 @@
+#include "utils.h"
+
+#include <QList>
+#include <math.h>
+
+double variance(const QList<double> &values)
+{
+    //The variance of a single value is 0
+    if (values.size() == 1) {
+        return 0;
+    }
+    double mean = 0;
+    for (auto value : values) {
+        mean += value;
+    }
+    mean = mean / static_cast<double>(values.size());
+    double variance = 0;
+    for (auto value : values) {
+        variance += pow(static_cast<double>(value) - mean, 2);
+    }
+    variance = variance / static_cast<double>(values.size() - 1);
+    return variance;
+}
+
+double maxDifference(const QList<double> &values)
+{
+    auto max = values.first();
+    auto min = values.first();
+    for (auto value : values) {
+        if (value > max) {
+            max = value;
+        }
+        if (value < min) {
+            min = value;
+        }
+    }
+    return max - min;
+}
-- 
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