in reply to [OT] Displaying 4D data in a 2D image.

how to represent the frequency at that point
Netscape gave a solution for that in the 1990s: <BLINK>. There's got to be at least some useragent that has a CSS property that allows to set the frequency of the blinking.

A more serious note, one way to visualize 6D data in 2D is to use coloured disks: 3 dimensions for its colour, 2 dimensions for the position of its center, and using the radius gives you a sixth.

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Re^2: [OT] Displaying 4D data in a 2D image.
by choroba (Cardinal) on Dec 10, 2011 at 00:35 UTC
    Nice. The circular sector can give you the seventh :)