FracStats

FracStats does R/S analysis and comparison to a normal distribution. It uses a time series, with or without difference processing on the input data. Also does multifractal analysis (f(alpha) curves) on time series or planar data, using either the method of moments or histogram method. Several data sets are supplied, but the main use is to paste in your own data to explore.

July 2012: Fixed pasting-my-data to work again, following Oracle/Java deciding that was a security risk. Now uses signed jars and JWS to bypass new security feature.

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DrivenIFS

DrivenIFS explores data-driven Iterated Function Systems.

July 2012: Fixed pasting-my-data to work again, following Oracle/Java deciding that was a security risk. Now uses signed jars and JWS to bypass new security feature.

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ArchaeoSim

ArchaeoSim explored social and environmental tradeoffs in ancient farming civilizations in ancient Subir (northern Mesopotamia). Includes detailed paleoclimate data and completed archaeological survey data. Used in teaching the Yale course Human Creation and Destruction of Environments.

Replaced by ArchaeoSim 4, an HTML5 incarnation.

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DaisyBall Java

DaisyBall is my custom 3D variation on Lovelock's classic DaisyWorld, with multiple sites around a sphere. Each site is represented by a daisy. Different lattitudes receive different solar input. Daisy color shows the dominant daisy species at each site.

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DaisyWorld Java

DaisyWorld is the classic model in 2D, demonstrating homeostasis via ecosystem feedback loops (daisy albedo). There is no spatial structure. The daisies indicate percent population at a single site.

Used in teaching "Intro to the Earth System" at UCLA, among other non-Yale courses.

Peter Schoch wrote a DaisyWorld Lab for teaching his community college Physics students (Thermodynamics, and Blackbody radiators). Thank you for sharing, Peter!

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Mandelbrot-Julia Sets

Mandelbrot-Julia Sets explores the famous Mandelbrot Set and its associated Julia Sets. Each point on the Mandelbrot set generates a Julia set to the right. Includes Julia orbits, several color schemes, and alternate functions besides the usual z2.

I also have a simpler Flash version. This was written as an ActionScript 3 performance test.

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