gregfjohnson.com

gregfjohnson.com

Welcome to Greg Johnson's web site. Some thoughts on Danny Hillis's mechanical binary adder. Rules of the road for high-quality software. Yet another attempt at developing intuition for the Fast Fourier Transform. A really small Ruby implementation of the Fast Fourier Transform algorithm. A fresh look at red-black trees. A handy interactive tool for experimenting with red-black trees. The infamous predecessor function for Church Numerals in the Lambda Calculus. 2-3 Trees in Ruby.

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Welcome to Greg Johnson's web site. Some thoughts on Danny Hillis's mechanical binary adder. Rules of the road for high-quality software. Yet another attempt at developing intuition for the Fast Fourier Transform. A really small Ruby implementation of the Fast Fourier Transform algorithm. A fresh look at red-black trees. A handy interactive tool for experimenting with red-black trees. The infamous predecessor function for Church Numerals in the Lambda Calculus. 2-3 Trees in Ruby.

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gregfjohnson.com | gregfjohnson.com Reviews

https://gregfjohnson.com

Welcome to Greg Johnson's web site. Some thoughts on Danny Hillis's mechanical binary adder. Rules of the road for high-quality software. Yet another attempt at developing intuition for the Fast Fourier Transform. A really small Ruby implementation of the Fast Fourier Transform algorithm. A fresh look at red-black trees. A handy interactive tool for experimenting with red-black trees. The infamous predecessor function for Church Numerals in the Lambda Calculus. 2-3 Trees in Ruby.

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gregfjohnson.com

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Some thoughts and speculations on Danny Hillis's mechanical binary adder

http://www.gregfjohnson.com/binaryadder

Some thoughts and speculations on Danny Hillis's mechanical binary adder. There are all kinds of wonderful mechanical devices that represent digital operations, ranging from puzzles such as the Chinese Rings to the Babbage differential analyzer. The Hillis mechanical binary adder is in this tradition. In Spring 2000 I visited the Long Now Foundation offices in the Presidio in San Francisco. Alexander and Camille graciously welcomed a couple of friends and me. Any and all mistakes, errors, gaffes, etc&#46...

2

A quine program written in awk

http://www.gregfjohnson.com/quine.awk

A quine program written in awk.

3

Rules of the road for developing high-quality software

http://www.gregfjohnson.com/software

Rules of the road for developing high-quality software. All code follows the Porthole Principle. The fundamental issue in programming is that we all look at the universe through finite brain-sized portholes. Therefore, systems must be structured so that they can be understood completely, at all levels, even though we are only allowed to investigate them piecemeal, through our own small, limited, and at times idiosyncratic cognitive windows. Be considerate to the readers of your code (including your futur...

4

The Foucault Pendulum

http://www.gregfjohnson.com/foucault

Some Fun and Intuition about the Foucault Pendulum. This is just what happens as you stand there in your parka feeding the polar bears watching the pendulum swing back and forth at the north pole. After about 24 hours, the pendulum will appear to have rotated an entire 360 degrees. But if you watch the stars (say it's winter so you can watch the stars for the entire 24 hours), you may notice that the pendulum is maintaining its orientation relative to the stars. Why might this be? For a cone of a given s...

5

ASCII art trees

http://www.gregfjohnson.com/asciitree.html

Enter a functional expression such as f(g(string, 4), h('string with sp', 5) :. Try a really interesting expression, the Y combinator from lambda calculus:. Lambda(f, apply(lambda(x, apply(f, apply(x, x) ), lambda(x, apply(f, apply(x, x) ) ).

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Welcome to Greg Johnson's web site. Some thoughts on Danny Hillis's mechanical binary adder. Rules of the road for high-quality software. Yet another attempt at developing intuition for the Fast Fourier Transform. A really small Ruby implementation of the Fast Fourier Transform algorithm. A fresh look at red-black trees. A handy interactive tool for experimenting with red-black trees. The infamous predecessor function for Church Numerals in the Lambda Calculus. 2-3 Trees in Ruby.

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