tristanwietsma’s gists

tristanwietsma / animals.txt

Last active December 16, 2015 18:29

Go file I/O example This shows how to read a text file in Go, line-by-line. The file is supplied via command-line. A list of lines is built using a slice and the append function. Duplicate lines are prevented using a map. The resulting list of lines is sorted and displayed.

	Aardvark
	Elephant
	Albatross
	Alligator
	Alpaca
	Anaconda
	Ant
	Anteater
	Antelope
	Armadillo

tristanwietsma / adaboost.py

Created April 30, 2013 01:13

AdaBoost Python implementation of the AdaBoost (Adaptive Boosting) classification algorithm.

	from __future__ import division
	from numpy import *

	class AdaBoost:

	def __init__(self, training_set):
	self.training_set = training_set
	self.N = len(self.training_set)
	self.weights = ones(self.N)/self.N
	self.RULES = []

tristanwietsma / batchjobs.py

Created April 30, 2013 01:15

Batch execution Given an list of shell commands, this script batches them out according to user-defined batch size or default CPU count.

	import threading, os, sys
	from multiprocessing import cpu_count

	NUM_CPUS = cpu_count()

	def batch_process(command_list, batch_size=NUM_CPUS):
	iteratorlock = threading.Lock()
	exceptions = []
	cmd = command_list.__iter__()

tristanwietsma / eurodollar_exdates.py

Created April 30, 2013 01:26

CME Eurodollar futures expiration date calculator

	from datetime import datetime, date, timedelta

	def EurodollarExpirations():
	start = datetime.now().date()
	n = 20
	ex = [date(2008,12,15)]
	for i in range(120):
	x = ex[-1]
	x += timedelta(days=91)
	if x.day <= 12: x += timedelta(days=7)

tristanwietsma / simplex_algo.py

Created April 30, 2013 01:34

Simplex solver I include an example from Wikipedia page on the topic. This version shows the tableau after each pivot.

	from __future__ import division
	from numpy import *

	class Tableau:

	def __init__(self, obj):
	self.obj = [1] + obj
	self.rows = []
	self.cons = []

tristanwietsma / aws-empty-bucket.py

Created April 30, 2013 01:42

AWS S3 administration scripts Some administration scripts for Amazon Web Services' S3 using Boto.

	import os, sys
	from boto.s3.connection import S3Connection
	from boto.s3.bucket import Bucket

	AWS_ACCESS_KEY = os.getenv('AWS_ACCESS_KEY')
	AWS_SECRET_KEY = os.getenv('AWS_SECRET_KEY')

	conn = S3Connection(AWS_ACCESS_KEY, AWS_SECRET_KEY)

	bucket_name = sys.argv[1]

tristanwietsma / crypto.py

Created April 30, 2013 01:55

Public-Private key encryption example

	import rsa

	(pubkey, privkey) = rsa.newkeys(512, poolsize=8)

	print pubkey

	print privkey

	msg = "this is a secret message!"

tristanwietsma / mercsettles.py

Created April 30, 2013 02:15

CME settlement price fetcher Ugly, but effective, script for getting CME settlement prices off their FTP side. Could use a clean up...

	import sys, string, urllib

	GROUPS = dict([('ags','ftp://ftp.cmegroup.com/pub/settle/stlags'),
	('rates','ftp://ftp.cmegroup.com/pub/settle/stlint'),
	('fx','ftp://ftp.cmegroup.com/pub/settle/stlcur'),
	('nymex','ftp://ftp.cmegroup.com/pub/settle/stlnymex'),
	('comex','ftp://ftp.cmegroup.com/settle/stlcomex'),
	('clearport','ftp://ftp.cmegroup.com/settle/stlcpc')])

	# month codes

tristanwietsma / helloworld.pyx

Created April 30, 2013 02:51

Cython example To compile into a shared library, execute: python setup.py build_ext --inplace

	cdef extern from "math.h":
	double sin(double)

	cdef double f(double x) except *:
	return sin(x**2)

	def integrate(double a, double b, int N):
	cdef int i
	cdef double s, dx
	s = 0

tristanwietsma / restful.go

Created April 30, 2013 03:16

RESTful service interface example RESTful service example in Go. Parses URI of form "localhost:8080/key'/value" into Redis (publishes <value> to channel <key>).

	package main

	import (
	"fmt"
	"github.com/vmihailenco/redis"
	"net/http"
	"strings"
	)

	func handler(w http.ResponseWriter, r http.Request, c redis.Client) {

Tristan Wietsma tristanwietsma