Experimenting with random walks

Root 2 in visual form

Based on this image created by Matt Henderson, I decided to write something for myself that would explore other possible random walks, although mine are generated in a slightly different way than what Matt did.

Each of these images (which will only appear in Chrome, Safari or Firefox, sorry people still using Internet Explorer) is a visual representation of the first 100, 000 digits of the number where each digit of the number corresponds to a different rotation. They may take a while to calculate, depending on the speed of your computer.

Note that for the last "random walk", I increased the scale significantly over the other random walks so that it made the pattern more obvious.

Facebooktwittergoogle_plusredditpinterestlinkedinmail

5 Comments

  • The links for “phi” points to the image for “e”…

  • David Wees wrote:

    Fixed. Thanks!

  • Nathan Clisby wrote:

    Hi David,

    Thanks for this!

    You might be interested in the work of Fran Aragón Artacho and colleagues in producing walks using digits of pi, e etc., by converting them to base 4 and using the different digits to give the step direction. Apart from being beautiful, it is a powerful technique (I think) for visually identifying randomness in decimal (well, base 4) expansions.

    Links:

    http://walks.carma.newcastle.edu.au/index.html (main project page)
    http://walks.carma.newcastle.edu.au/walks.html (images of walks)
    http://walks.carma.newcastle.edu.au/publications.html (link to paper describing the main idea and its applications)

    Cheers,

    Nathan

  • Carl Oliver wrote:

    The image for 1/7th is surprising! It looks like the spiral pieces that Christopher Danielson makes. Did you try it with any other fractions that have a longer repeating cycle?

  • David Wees wrote:

    Hi Carl,

    I don’t remember actually. I do remember choosing 1/7 because the cycle was more likely to be visible. It would be interesting to use something like 123456789/9999999999.

    Actually, in the long run it would be nice to be able to allow the user to just enter in a number instead of me needing to hard-code in the numbers.

    David

Leave a Reply

Your email is never shared.Required fields are marked *