Articles by Christian Chapman

  1. Some Naive Thoughts on Bitcoin Gambling: Hold or Sell?

    I own some bitcoin and I intend to hold for a really long time. The total value of my crypto holdings is small enough that I would be OK with it losing all of it, but I would really prefer it to grow instead.

    There are moments when I believe …

  2. Modifying a Plustek 8100 to Scan Medium Format

    The Plustek 8100 is a relatively cheap but good quality film scanner. It produces much nicer scans than most flatbed-type scanners, but it can only capture small format film. In this page I show how to modify a Plustek 8100 to scan medium format (120 film) by stitching together multiple …

  3. Hypersphere Cap Volumes in Matlab

    The volume of a height-h cap of a ball of radius r in dimension n can be derived:

    \begin{equation} \operatorname{vol}(\operatorname{cap}) = \frac{1}{2} \cdot \frac{\pi^{n/2}}{\Gamma\left(1+n/2\right)} \cdot r^n \cdot I_{(2rh-h^2)/r …

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