r.tar.gz

rcpp-and-armadillo

rcpp-eigen

rcpp-and-armadillo-spa

rcpp-and-armadillo-spa-copy

Matrix algebra is the foundation for machine learning, signal processing, image processing, and many other popular algorithms. It is very important that aspiring computer scientists get a solid understanding of the subject, and there’s no better way to achieve this than coding matrix algebra operations.

The course aims to teach you how to code matrix algebra operations in R, and with main C++ matrix algebra libraries: RcppArmadillo and RcppEigen. Moreover,  to clarify the matrix algebra operations, a simple algorithm is provided to understand the computing implications. The provided matrix algebra operations range from matrix summation and matrix multiplication to LU factorization and eigendecomposition.

The main course outcome is to develop hands-on experience via curated programs to perform the matrix algebra computation in the R and Rcpp ecosystem, also including the ability to develop algorithms for areas such as machine learning, image processing and signal processing.

Computing Matrix Algebra with R and Rcpp

**Matrix multiplication** is defined element by element as:

$$𝐶 = 𝐴∗𝐵$$

$$
c_{ij} = \displaystyle\sum_{k=1}^p𝑎_{𝑖𝑘}𝑏_{𝑘𝑗}
$$

In this equation: 

- $𝐴$ has $(𝑚 \times 𝑝)$ dimensions
- $𝐵$ has $(𝑝 \times 𝑛)$ dimensions

> **Note:** The inner dimensions of matrix multiplication—the number of columns in the first matrix and the number of rows in the second one—must be equal.

Learn how to multiply matrices using R, Rcpp, Armadillo, and Eigen.

Introduction

Assignment Operator

Addition of Matrices

Scalar Multiplication of Matrices

Multiplication of Matrices

Transposition of Matrices

Determinant of a Matrix

Inverse of a Matrix

System of Linear Equations

LU Matrix Factorization

Cholesky Factorization

QR Matrix Factorization

Eigendecomposition

Wrapping It Up

Multiplication Operation on Matrices