Tristan Wietsma tristanwietsma
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.
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| 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.
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| 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.
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| 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
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| 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.
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| 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.
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| 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] |
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| 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...
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| 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
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| 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>).
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| package main | |
| import ( | |
| "fmt" | |
| "github.com/vmihailenco/redis" | |
| "net/http" | |
| "strings" | |
| ) | |
| func handler(w http.ResponseWriter, r *http.Request, c *redis.Client) { |
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