Multiplication

0.1 Introduction

Instance of: operation of arithmetic

0.2 Frequentist

AKA: * ; × ; ⋅ ; multiply

Distinct from:

English:

Formalization:

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Cites: Wikipedia ; Wikidata ; Wolfram

3Blue1Brown: Matrix multiplication as composition | Chapter 4, Essence of linear algebra 3Blue1Brown: Cross products in the light of linear transformations | Chapter 11, Essence of linear algebra

Code

R

Documentation: mean: Arithmetic Mean

Examples:

Python

Documentation: numpy.mean

Examples:

SQL

Documentation: PostgreSQL AVG Function

library(DBI)
# Create an ephemeral in-memory RSQLite database
#con <- dbConnect(RSQLite::SQLite(), dbname = ":memory:")
#dbListTables(con)
#dbWriteTable(con, "mtcars", mtcars)
#dbListTables(con)

#Configuration failed because libpq was not found. Try installing:
#* deb: libpq-dev libssl-dev (Debian, Ubuntu, etc)
#install.packages('RPostgres')
#remotes::install_github("r-dbi/RPostgres")
#Took forever because my file permissions were broken
#pg_lsclusters
require(RPostgres)

Loading required package: RPostgres

# Connect to the default postgres database
#I had to follow these instructions and create both a username and database that matched my ubuntu name
#https://www.digitalocean.com/community/tutorials/how-to-install-postgresql-on-ubuntu-20-04-quickstart
con <- dbConnect(RPostgres::Postgres())

Torch

import torch

0.3 Bayesian

English: Formalization:

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Cites:

Code