frank
a22290415e
fixed umbrella header for stats added error-feedback to wifi optimizers improved logging for wifi optimizers adjusted calling-API for wifi-optimizers
49 lines
756 B
C++
49 lines
756 B
C++
#ifndef STATS_VARIANCE_H
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#define STATS_VARIANCE_H
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#include "../../Assertions.h"
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#include "Average.h"
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namespace Stats {
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template <typename Scalar> class Variance {
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Average<Scalar> avg;
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Average<Scalar> avg2;
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public:
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/** ctor */
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Variance() {
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;
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}
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/** contains valid data? */
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bool isValid() const {
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return avg.isValid();
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}
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/** add a new value */
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void add(const Scalar val) {
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avg.add(val);
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avg2.add(val*val);
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}
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/** get the current variance */
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Scalar get() const {
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Assert::isTrue(avg.isValid(), "add() values first!");
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return avg2.get() - (avg.get()*avg.get());
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}
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/** get the current stadard-deviation */
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Scalar getStdDev() const {
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return std::sqrt(get());
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}
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};
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}
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#endif // STATS_VARIANCE_H
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