cumsum

C++ Function Reference

1 Signature

Eigen::VectorXd BigDataStatMeth::cumsum(Eigen::VectorXd x)

2 Description

Compute cumulative sum of a vector.

3 Parameters

x (Eigen::VectorXd): Input vector

4 Returns

Vector containing cumulative sums

5 Details

Calculates the cumulative sum (running sum) of elements in a vector. For a vector [a, b, c], returns [a, a+b, a+b+c].

6 Caller Graph

7 Source Code

Implementation

File: inst/include/memAlgebra/memOtherFunctions.hpp • Lines 55-66

inline Eigen::VectorXd cumsum(Eigen::VectorXd x)
    {
        // initialize an accumulator variable
        double acc = 0;
        // initialize the result vector
        Eigen::VectorXd res = Eigen::VectorXd::Zero(x.size());
        for(int i = 0; i < x.size(); i++){
            acc += x[i];
            res[i] = acc;
        }
        return res;
}

8 Usage Example

#include "BigDataStatMeth.hpp"

// Example usage
auto result = cumsum(...);

---
title: "cumsum"
subtitle: "C++ Function Reference"
---

## Signature

```cpp
Eigen::VectorXd BigDataStatMeth::cumsum(Eigen::VectorXd x)
```

## Description

Compute cumulative sum of a vector.

## Parameters

- `x` (`Eigen::VectorXd`): Input vector

## Returns

Vector containing cumulative sums

## Details

Calculates the cumulative sum (running sum) of elements in a vector. For a vector [a, b, c], returns [a, a+b, a+b+c].

## Caller Graph

::: {.diagram-section}
<object type="image/svg+xml" data="images/namespace_big_data_stat_meth_aee22711cb348213d6d99810104238398_icgraph.svg" class="class-diagram">
  <img src="images/namespace_big_data_stat_meth_aee22711cb348213d6d99810104238398_icgraph.svg" alt="Function dependencies"/>
</object>
:::

## Source Code

::: {.callout-note collapse="true"}
### Implementation

**File:** `inst/include/memAlgebra/memOtherFunctions.hpp` • **Lines 55-66**

```cpp
inline Eigen::VectorXd cumsum(Eigen::VectorXd x)
    {
        // initialize an accumulator variable
        double acc = 0;
        // initialize the result vector
        Eigen::VectorXd res = Eigen::VectorXd::Zero(x.size());
        for(int i = 0; i < x.size(); i++){
            acc += x[i];
            res[i] = acc;
        }
        return res;
}
```
:::

## Usage Example

```cpp
#include "BigDataStatMeth.hpp"

// Example usage
auto result = cumsum(...);
```