62 lines
1.2 KiB
C++
62 lines
1.2 KiB
C++
#pragma once
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#include <cstdint> //uint64_t
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#include <cmath> // std::abs
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#include "utils/vector.h"
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#include "utils/matrix.h"
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#include "numerics/mean.h"
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namespace numerics::detail{
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template <typename T>
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inline T standard_deviation_serial(const utils::Vector<T>& v) {
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const uint64_t n = v.size();
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if (n == 0){
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throw std::runtime_error("std_serial: empty vector");
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}
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const T mean_value = numerics::mean(v);
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T sum_squared_diff = T{0};
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for (uint64_t i = 0; i < n; ++i){
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const T diff = v[i] - mean_value;
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sum_squared_diff += diff * diff;
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}
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const T variance = sum_squared_diff / static_cast<T>(n);
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return numerics::sqrt(variance);
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}
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template <typename T>
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inline T standard_deviation_serial(const utils::Matrix<T>& A) {
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const uint64_t rows = A.rows();
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const uint64_t cols = A.cols();
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const T mean_value = numerics::mean(A);
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T sum_squared_diff = T{0};
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for (uint64_t i = 0; i < rows; ++i){
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for (uint64_t j = 0; j < cols; ++j){
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const T diff = A(i,j) - mean_value;
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sum_squared_diff += diff * diff;
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}
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}
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const T variance = sum_squared_diff / static_cast<T>(rows*cols);
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return numerics::sqrt(variance);
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}
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} // namespace numerics
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