TheRayTracer’s gists

TheRayTracer / main.cpp

Last active August 29, 2015 14:00

This code sample parses the results from a machine learning algorithm to produce receiver operating characteristic (ROC) curves. The curve plot points must be manually charted in an external application such as a spreadsheet application.

	#include <iostream>
	#include <fstream>
	#include <iomanip>
	#include <cmath>
	#include <algorithm>
	#include <string>
	#include <vector>
	#include <set>
	#include <cassert>

TheRayTracer / main.cpp

Created April 30, 2014 10:38

Computes epsilon - the smallest value such that, when added to 1, is still distinguishable from 1.

	#include <iostream>
	#include <limits>
	#include <cassert>

	namespace std { }
	using namespace std;

	/* Computes the smallest value such that, when added to 1, is still distinguishable from 1. */
	template<typename T>
	int epsilon(T& eps)

TheRayTracer / iris_classification_results.png

Last active August 14, 2017 09:44

This R script demonstrates Machine Learning and classification using the Caret package. First, the Iris set is divided into a training set and a test set. Secondly, the model is trained. Then, predictions are queried and accuracy is calculated. Lastly, RoC curves are plotted for evaluation. Plots are generated for each step.

TheRayTracer / cpuid.h

Last active August 29, 2015 14:06

Utility of functions that help to determine specific CPU features, including determining the vendor of the CPU.

	#ifndef CPUID_H
	#define CPUID_H

	#include <memory.h>

	#define FAMILY_ID 0x0000F00
	#define EXT_FAMILY_ID 0x0F00000

	#define PENTIUM4_ID 0x0000F00

TheRayTracer / chart.png

Last active August 29, 2015 14:10

A small collection of scripts to simulate and analyse a game of Monopoly.

TheRayTracer / main

Last active August 29, 2015 14:19

Two puzzles solved using Python. 1. The classic "Make 4 litres from only a 3 litre and 5 litre jug without markings except of a total volume" problem. Two methods are illustrated using a simple Jug class. 2. Maximising the profit by buying low and selling high from yesterday's stock prices.

	class jug:
	def __init__(self, size):
	self.size = size
	self.volume = 0
	self.waste = 0

	def empty(self):
	self.waste = self.waste + self.volume
	self.volume = 0

TheRayTracer / lm75a.sh

Created November 8, 2015 11:20

This entry contributes a simple Bash script to query and control a LM75 Digital Temperature Sensor via I2C. The second Bash script is a utility to interact with a real-time clock (RTC). The third entry is a Python script for a mini web server to retrieve the temperature in either Celsius (default) or Fahrenheit. These were a few very fun weekend…

	#!/bin/bash

	readonly lm75=0x48 # Slave address with A0, A1, and A2 set to 0v (ground).

	while [ $# -gt 0 ]
	do
	if [ "$1" == "-debug" ]
	then
	debug=true
	fi

TheRayTracer / SSD1306.py

Last active August 4, 2019 00:03

The below Python source controls an OLED display (size 128 x 64) using a SSD1306 chipset and the SPI interface. The source code initialises the chipset setting the 2 orange pages at the top of the display, and includes functions for drawing primitive shapes and a full ASCII set.

	import struct
	import spidev
	import sys
	import time
	import random
	import RPi.GPIO as gpio

	ascii = [
	[ 0x55, 0x00, 0x55, 0x00, 0x55 ],
	[ 0x55, 0x00, 0x55, 0x00, 0x55 ],

TheRayTracer / SSD1331.py

Last active March 12, 2020 13:18

The below Python source files control an OLED display (size 96 x 64, 65K colours) using a SSD1331 chipset and the SPI interface. The source code initialises the chipset and includes hardware accelerated functions for drawing primitive shapes and a non-hardware accelerated full ASCII set. Examples include a basic Space Invaders game, and a clock.

	import struct
	import spidev
	import sys
	import time
	import random
	import RPi.GPIO as gpio

	ascii = [
	[ 0x55, 0x00, 0x55, 0x00, 0x55 ],
	[ 0x55, 0x00, 0x55, 0x00, 0x55 ],

TheRayTracer / mushrooms_explore_a.png

Last active October 6, 2022 20:30

Using R to explore the UCI mushroom dataset reveals excellent KNN prediction results.

Simon Flannery TheRayTracer