# Error Propagation Library

This python project implements arbitrary arithmetic on random variables numerically. As a short illustrative example, suppose $$x$$ and $$y$$ are random variables representing the measurement of two tiles on the floor. We sample $$x$$ to be 30.1 cm and $$y$$ to be 30.3 cm. Say we use a meter stick which gives some error $$\sigma$$ to both measurements. We can model $$x$$ as a normal distribution with center at 30.1 and standard deviation $$\sigma$$ and $$y$$ as a similar distribution centered at 30.3. Then the random variable $$x+y$$ gives the probability distribution for the actual combined length of the two tiles.

This library allows arithmetic on arbitrary expressions.

# Koval's 3D Grapher

Koval's 3D Grapher is a WebGL accellerated function plotter in 3D. It has a few features:

• Support for Cartesian, spherical and cylindrical coordinate systems
• Integrated parametric plotting
• Support for vector operations through the Math.js library
• Customizable plot quality, color, and transparency
• Intuitive mouse zoom and rotation mechanics # Pixel Physics

Ever wanted to try out your latest cellular automaton idea but don't want to spend the time coding it?

If the answer is yes then you are a total nerd. Luckly so am I, and today's your lucky day. It's not blazing fast but it's a great tool for prototyping.

For some quick eye-candy, click the options button (the gear) and scroll down to the examples pop-down menu. # Brainfuck Interpreter

Brainfuck is what we call an esoteric programming language. It is aptly named. You can get some quick (visible) output with the program -[.-].

You can pause and step forward and backward while seeing your spot in the code in real time.