Deterministic Chaos

6.R. Kelly Plots of the Tent Map and the Logistic Map

Recall the Kelly plot method for representing data. We take the tent and logistic maps as the generators of our examples.

Here is the color scheme for the bins: left to right for lowest to highest.

Here are some examples with the logisitc and tent maps, for the indicated s.

Logistic
0.9, 0.99
1.5, 1.5
2.4, 2.9
3.1, 3.5
3.55, 3.57
3.6, 3.7
3.8, 3.825
3.826, 3.827
3.828, 3.829
3.846, 3.999
Tent
1.2, 1.32
1.4, 1.5
1.7, 1.8
1.9, 1.999
s = 3.1. The 2-cycle is stable. Note the alternating pattern of black and brown boxes. Click the picture to enlarge. s = 3.5. What do you see? Often the first answer is a 3-cycle, because there are three colors: green, brown, and black. However, it is not the number of colors, so much as the order of colors that is important. Note the pattern: green, brown, black, brown, then repeat. The repeating pattern is of length four, and indeed the s = 3.5 logistic map has a 4-cycle. Click the picture to enlarge.

Here is an illustration of sensitivity to initial conditions by Kelly plots.
Here are some animations of how the Kelly plot varies with the s parameter of the logistic and tent maps.

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