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Posts tagged with waves

Standing waves in 2-D via dhiyamuhammad.
Pretty amazing that if you simply add together oscillations = vibrations = waves = harmonics and constrain them within a box, that all these shapes emerge. (See this video for such waves being constructed in real life). By the way, mathematicians sometimes refer to these as “square drumhead” problems because a drumhead is a real-life 2-D surface that vibrates in exactly these kinds of ways to produce the sounds we associate with various drums.
In the link Muhammad points to—Harmonic Resonance Theory—the mathematics of standing waves are applied to the problem of Gestalt in psychology of sense experience.

Standing waves in 2-D via dhiyamuhammad.

Pretty amazing that if you simply add together oscillations = vibrations = waves = harmonics and constrain them within a box, that all these shapes emerge. (See this video for such waves being constructed in real life). By the way, mathematicians sometimes refer to these as “square drumhead” problems because a drumhead is a real-life 2-D surface that vibrates in exactly these kinds of ways to produce the sounds we associate with various drums.

In the link Muhammad points to—Harmonic Resonance Theory—the mathematics of standing waves are applied to the problem of Gestalt in psychology of sense experience.


hi-res




The classic red/green colouring scheme for trading screens seems too alarmist.

http://media.dailyfx.com/illustrations/2012/04/30/AUDUSD_Trading_the_Reserve_Bank_of_Australia_Interest_Rate_Decision_body_ScreenShot100.png

http://graphics.moneyshow.com/traders/TipsCharts/March2012/daytraders07_1_med.gif

http://i.istockimg.com/file_thumbview_approve/7204532/2/stock-photo-7204532-stock-market-financial-trading-screen-in-green-and-red.jpg

http://accuratestocktrading.com/wp-content/uploads/2010/01/screenshot-when-email-alert5.jpg
http://media.dailyfx.com/illustrations/2012/04/30/AUDUSD_Trading_the_Reserve_Bank_of_Australia_Interest_Rate_Decision_body_ScreenShot100.png
http://4xlounge.com/wp-content/uploads/2011/07/tbconsolelive.png

Conceptually, the red/green distinction makes sense as corresponding to stop/go in traffic signals. But traffic signals need to be neon and striking in a hectic 3-D environment where it’s paramount for everyone to definitely not-miss the stop command.

But in a sheltered 2-D environment where goals commonly include to master emotion, to control passive reactivity, to keep a long-term head in the middle of short-term volatility, and to digest (calmly) massive amounts of information en simultáneo, neon red/green seems too grating.

yellow and blue trading screen (GVZ)

I made the above picture with R of course, like this:

    require(quantmod)
    getSymbols("^GVZ")
    chartSeries(GVZ)
    reChart(up.col="light blue", dn.col="yellow")

(GVZ is the gold volatility index.)

It’s not a perfect colour scheme—I would use Lab to do better—but it already improves on #FF0000 versus #00FF00.

 

One theory of the evolution of trichromacy in primates says that

  • red/green dichotomy tells us whether meat or fruit is rotten or ripe (especially in dappled light)
  • blue/yellow dichotomy tells us how cool/warm something is
  • light/dark (value) is the most basic kind of vision.

If we take that as a starting point, a less alarmist colour scheme for trading software could use the blue/yellow dichotomy to indicate whether a security price went up or down. Use a neutral chroma for “small” moves (this depends upon one’s time-frame, but properly the definition of “big move” should be calibrated to an exponential moving average with some width depending on one’s market telescope). Intensity of the move could be signalled with lightness, so that most figures on a screen are a readable lightness of a neutral colour, but “big moves” are tinged with convexly more chroma and very-convexly more lightness.

XSTRATA

The definition of “up/down” might be refigured as whether the trader is short/long the security in question, or perhaps redness/greenness could be used in conjunction with the “market view” of cold/hot, to indicate whether a security is moving for/against one’s strategy. That too could be seen as overly alarming, but a (pseudo)convex coding of red-ness might again solve the problem again, only invoking the “panic mode” when there’s really something to worry about.

(Source: twitter.com)




water in space —

  • spherical bubbles
  • fizzy Pac Man
  • a hollow sphere (BTW, what’s the topology of a hollow sphere?)
  • surface waves & internal waves
  • momentum and re-action in outer space
  • bubble wars
  • fluid dynamics are sexy
  • um, there’s an international space station. In outer space. And people go there for fun / science.

grâce à Virgil