Esteban Zapata Rojas estebanz01

🤓

I'm scared, I see data everywhere.

estebanz01 / bikesharing.R

Created November 13, 2018 02:59

Bike Sharing Dataset - Random Forest basic prediction with validation of variables used at training time

	# I got this working with code from https://datascienceplus.com/random-forests-in-r/
	# It is an excelent resource!
	set.seed(50)
	bikeperday <- read.csv('Bike-Sharing-Dataset/day.csv')

	# Calculate sample
	sample <- sample.int(n = nrow(bikeperday),
	size = floor(.75 * nrow(bikeperday)),
	replace = F)

estebanz01 / newtons_method.rb

Last active March 4, 2019 20:29

Ruby snippet that tries to compute and find the root for a function using the Newton-Raphson method.

	#!/usr/env ruby

	def derivative_of(f:, x:)
	h = 1e-14 # 1 * 10^-14 this is the smallest number ruby can handle in calculations before defaulting result to zero.

	(f.call(x + h) - f.call(x)) / h # This is a naive approach to calculate limit of f(x) in x.
	end

	# Newton's Method, where we calculate f(x), f'(x) and calculate error.
	def find_root(f:, seed:, iterations: nil, error_level: nil)

estebanz01 / integral_aproximation_rules.rb

Created May 3, 2019 20:47

Implementation of the composite rules used to approximate defined integrals, written in ruby.

	def x_sub(index, lower, h)
	x_k = lower + (index * h)
	end

	def booles_rule(lower, upper, &block)
	h = (upper - lower) / 4.0

	sum = 0
	sum += 7 * yield(lower)
	sum += 32 * yield(x_sub(1, lower, h))

estebanz01 / accidentes-envigado.csv

Created May 22, 2019 21:39

We can't make this file beautiful and searchable because it's too large.

	RADICADO,FECHA,HORA,DÍA DE LA SEMANA,CLASE DE VEHICULO,TIPO DE SERVICIO,TIPO DE VICTIMA,SEXO,ESTADO DE BEODEZ,RESULTADO DE BEODEZ,GRAVEDAD,CLASE DE ACCIDENTE,CAUSA,DIRECCIÓN,BARRIO,AREA,Coordenadas
	2181714,06/30/2018,2:55 p.m.,sábado,TRACTOCAMION,PUBLICO,Conductor,Masculino,No,N/A,SOLO DAÑOS,Choque,No mantener distancia de seguridad,Carrera 48 Calle 50 Sur,LAS VEGAS,Urbana,
	2181733,06/30/2018,9:50 a.m.,sábado,BUS,PUBLICO,Conductor,Masculino,No,N/A,SOLO DAÑOS,Choque,Desobedecer senales,Carrera 50 Calle 46 Sur,LAS VEGAS,Urbana,"(6.16131219, -75.603198185)"
	2181733,06/30/2018,9:50 a.m.,sábado,AUTOMOVIL,PARTICULAR,Conductor,Masculino,No,N/A,SOLO DAÑOS,Choque,Desobedecer senales,Carrera 50 Calle 46 Sur,LAS VEGAS,Urbana,"(6.16131219, -75.603198185)"
	2181717,06/30/2018,10:45 p.m.,sábado,MOTOCICLETA,PARTICULAR,Motociclista,Masculino,No,N/A,SOLO DAÑOS,Choque,Desobedecer senales,Calle 37 Sur Carrera 36,MESA,Urbana,"(6.168044613, -75.583236971)"
	2181717,06/30/2018,10:45 p.m.,sábado,AUTOMOVIL,PARTICULAR,Conductor,Mas

estebanz01 / chat.css

Last active March 23, 2024 23:42

A chat with webworkers in it.

estebanz01 / Gemfile

Created December 18, 2021 02:54

Generate a hash with arbitrary depth and keys with fake information. Because why not.

estebanz01 / distances.ex

Last active July 30, 2023 15:29

Some distance metrics implemented in plain Elixir, with tests. Blog in spanish: https://estebanz.co/posts/distance-metrics-in-elixir/

	defmodule Distances do
	def euclidean(a, b) when length(a) > 0 and length(b) > 0 and length(a) == length(b) do
	# We zip both lists into one, then we reduce it to the euclidean calculation.
	# Enum.zip_reduce(a, b, 0, fn) <- as a shortcut.
	Stream.zip(a, b)
	\|> Enum.reduce(0, fn {x, y}, accumulator ->
	accumulator + (x - y) ** 2
	end)
	\|> :math.sqrt()
	end