Rcpp_matrixVectorMultiplication_byCol

C++ Function Reference

1 Signature

Eigen::MatrixXd BigDataStatMeth::Rcpp_matrixVectorMultiplication_byCol(Eigen::MatrixXd X, Eigen::VectorXd v)

2 Description

Matrix-vector multiplication by columns.

3 Parameters

X (Eigen::MatrixXd): Input matrix
v (Eigen::VectorXd): Input vector

4 Returns

Result of column-wise multiplication

5 Details

Multiplies each column of a matrix by a vector element-wise.

6 Caller Graph

7 Source Code

Implementation

File: inst/include/hdf5Algebra/vectormatrix.hpp • Lines 123-126

inline Eigen::MatrixXd Rcpp_matrixVectorMultiplication_byCol(Eigen::MatrixXd X, Eigen::VectorXd v) {
    X = X.array().rowwise() * v.transpose().array();    
    return(X);
}

8 Usage Example

#include "BigDataStatMeth.hpp"

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

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

## Signature

```cpp
Eigen::MatrixXd BigDataStatMeth::Rcpp_matrixVectorMultiplication_byCol(Eigen::MatrixXd X, Eigen::VectorXd v)
```

## Description

Matrix-vector multiplication by columns.

## Parameters

- `X` (`Eigen::MatrixXd`): Input matrix
- `v` (`Eigen::VectorXd`): Input vector

## Returns

Result of column-wise multiplication

## Details

Multiplies each column of a matrix by a vector element-wise.

## Caller Graph

::: {.diagram-section}
<object type="image/svg+xml" data="images/namespace_big_data_stat_meth_ac767afbcae7ea9b90fe7ffa805badf06_icgraph.svg" class="class-diagram">
  <img src="images/namespace_big_data_stat_meth_ac767afbcae7ea9b90fe7ffa805badf06_icgraph.svg" alt="Function dependencies"/>
</object>
:::

## Source Code

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

**File:** `inst/include/hdf5Algebra/vectormatrix.hpp` • **Lines 123-126**

```cpp
inline Eigen::MatrixXd Rcpp_matrixVectorMultiplication_byCol(Eigen::MatrixXd X, Eigen::VectorXd v) {
    X = X.array().rowwise() * v.transpose().array();    
    return(X);
}
```
:::

## Usage Example

```cpp
#include "BigDataStatMeth.hpp"

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