Dot product

0.1 Introduction

Instance of: algebraic operation

AKA: scalar product; inner product ; projection product ; $ · $

Distinct from:

English:

Formalization:

\[ a \cdot b \]

Cites: Wikipedia ; Wikidata ; Wolfram

3Blue1Brown: Dot products and duality | Chapter 9, Essence of linear algebra

Code

R

Documentation:

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

0.2 Bayesian

English: Formalization:

\[ \]

Cites:

Code