README.md

In pat-alt/fromScratchR: Accompanying package of "From Scratch" book.

fromScratchR

fromScratchR is the accompanying package of fromScratch - a book that collects ideas, notes, exercises and code that students of the MSc in Data Science at Barcelona GSE were exposed and/or came up with during their studies. Both the book and this package are meant for educational purposes and cover a broad range of topics. The package primarily serves the purpose of making it easier for readers of the book to engage with relevant R code. Most if not all functions implemented in this package have already been implemented in established packages. Coding them up from scratch is an educational exercise for the authors and hopefully interacting with the code is beneficial to readers.

Installation

You can install the development version from GitHub with:

# install.packages("devtools")
devtools::install_github("pat-alt/fromScratchR")

Example

Below is a simple example of a function from the book. rorthogonal generates a random orthogonal matrix through singular value decomposition.

library(fromScratchR)
## basic example code
X <- rorthogonal(n=100,5)
crossprod(X)
#>               [,1]          [,2]          [,3]          [,4]          [,5]
#> [1,]  1.000000e+00 -3.474732e-16 -6.028164e-17 -3.021671e-16 -7.432206e-17
#> [2,] -3.474732e-16  1.000000e+00 -8.500145e-17 -1.812786e-16 -1.057639e-16
#> [3,] -6.028164e-17 -8.500145e-17  1.000000e+00  1.769418e-16  1.925543e-16
#> [4,] -3.021671e-16 -1.812786e-16  1.769418e-16  1.000000e+00  1.045171e-16
#> [5,] -7.432206e-17 -1.057639e-16  1.925543e-16  1.045171e-16  1.000000e+00

pat-alt/fromScratchR documentation built on Dec. 31, 2020, 1:14 a.m.