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cumulative_sum.hpp
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1 #ifndef STAN_MATH_PRIM_MAT_FUN_CUMULATIVE_SUM_HPP
2 #define STAN_MATH_PRIM_MAT_FUN_CUMULATIVE_SUM_HPP
3
4 #include <stan/math/prim/mat/fun/Eigen.hpp>
5 #include <vector>
6
7 namespace stan {
8 namespace math {
9
21 template <typename T>
22 inline std::vector<T>
23 cumulative_sum(const std::vector<T>& x) {
24 std::vector<T> result(x.size());
25 if (x.size() == 0)
26 return result;
27 result[0] = x[0];
28 for (size_t i = 1; i < result.size(); ++i)
29 result[i] = x[i] + result[i-1];
30 return result;
31 }
32
47 template <typename T, int R, int C>
48 inline Eigen::Matrix<T, R, C>
49 cumulative_sum(const Eigen::Matrix<T, R, C>& m) {
50 Eigen::Matrix<T, R, C> result(m.rows(), m.cols());
51 if (m.size() == 0)
52 return result;
53 result(0) = m(0);
54 for (int i = 1; i < result.size(); ++i)
55 result(i) = m(i) + result(i-1);
56 return result;
57 }
58 }
59 }
60 #endif
stan::math::cumulative_sum
std::vector< T > cumulative_sum(const std::vector< T > &x)
Return the cumulative sum of the specified vector.
Definition: cumulative_sum.hpp:23
Eigen.hpp

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