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(Come in under the shadow of this red rock)

Derrick Turk derrickturk

(Come in under the shadow of this red rock)
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derrickturk / qc_plots.R
Created Jan 8, 2014
Here's a simple but useful function for quickly reviewing distributions and missing data. Suitable for preliminary data QC and exploratory analysis.
View qc_plots.R
# (c) 2013 dwt | terminus data science, LLC
# freely licensed for non-commercial use
qc.plots <- function(df, max.levels=25, ask=TRUE, col="white")
old.par <- par(ask=ask)
for (var in names(df)) {
vals <- df[[var]]
derrickturk /
Created Jan 8, 2014
A simple generic simulated annealing solver, and basic implementations of the "standard" acceptance probability function and exponential-decay temperature schedules.
from random import Random
import math
def anneal(initial, energyfn, candidatefn, acceptancefn, temperaturefn, tmax):
rand = Random()
t = 0
solution = initial
s_best = initial
e_best = energyfn(initial)
derrickturk / fork_and_pipes.cpp
Created Jan 8, 2014
Some didactic example code, intended to help my brother through a poorly-taught "C++" class. I was a little hamstrung by the fact that the class taught (bad C + "new" and "delete" + bad Java) and called it C++...
View fork_and_pipes.cpp
#include <cstdio>
#include <cstdlib>
#include <csignal>
#include "unistd.h"
#include "sys/wait.h"
#include "sys/types.h"
#include "sys/time.h"
// I can never remember this...
derrickturk /
Created Jan 29, 2014
In the game of web scraping, you win... or you die.
from urllib import request
from sys import argv, stdout, stderr
from time import sleep
from random import randrange
import re
def main(argv):
if len(argv) == 1:
with open(argv[0], 'r') as f:
derrickturk / hsv_scale.R
Last active Aug 29, 2015
Handy function for HSV-scale-izing real-valued data.
View hsv_scale.R
hsv.scale <- function (var, hmin, hmax=hmin, smin=1, smax=smin, vmin=1, vmax=vmin,
na.col=rgb(0.75, 0.75, 0.75))
var.min <- min(var, na.rm=TRUE)
var.max <- max(var, na.rm=TRUE)
h.f <- approxfun(c(var.min, var.max), c(hmin, hmax))
s.f <- approxfun(c(var.min, var.max), c(smin, smax))
v.f <- approxfun(c(var.min, var.max), c(vmin, vmax))
tmp <- var
derrickturk / iife.R
Created Feb 6, 2014
Javascript style "immediately invoked function expressions" plus on.exit for scope guards in R. Cleanup actions get carried out regardless of clean or error exit from block.
View iife.R
(function() {
View columns.html
<!DOCTYPE html>
<meta charset="utf-8">
<style type="text/css">
body {
-moz-columns: 20em;
-webkit-columns: 20em;
columns: 20em;
-moz-column-gap: 2em;
derrickturk / build.bat
Created Feb 25, 2014
Dinking around with building windows DLLs with MinGW again. And figured out where the [[gnu::stdcall]] goes.
View build.bat
g++ -std=c++11 -Wall -Wextra -c dlltest.cpp
g++ -shared -static-libgcc -static-libstdc++ -o dlltest.dll dlltest.o -Wl,--add-stdcall-alias
View fun_with_c++11.cpp
#include <iostream>
constexpr int fac(int n)
return n <= 0 ? 1 : n * fac(n - 1);
struct [[weenie]] C {
void f() && { std::cout << "dying C's last gasp!\n"; }
void f() & { std::cout << "living, breathing C\n"; }
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