output: github_document

knitr::opts_chunk$set(
  collapse = TRUE,
  comment = "#>",
  fig.path = "man/figures/README-",
  out.width = "100%"
)

matricks

Useful tricks for matrix manipulation

Installation

matricks is available on CRAN, so you can install it using simply:

install.packages('matricks')

If you rather want to install dev version, you can do it with devtools.

devtools::install_github('krzjoa/matricks')

Usage

Main matricks functions are m and v, which provide convenient API to create matrices and vectors. Why should we write:

matrix(c(5, 6, 7,
         8, 0, 9,
         3, 7, 1), nrow = 3, byrow = TRUE)

if we can simply create such a matrix like that:

library(matricks)

m(5, 6, 7|
  8, 0, 9|
  3, 7, 1)

v function is an useful shortcut for creating vertical vectors (single columns)

v(1,2,3)
v(1:5)

Setting values in easier with matricks

mat <- matrix(0, 3, 3)
set_values(mat, c(1, 2) ~ 0.5, c(3, 1) ~ 7)