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词汇 Logistic map
分类 英语词汇 英语翻译词典
释义

Logistic map

中文百科

单峰镜像

r=4的单峰镜像,二维及三维的相图,其中可看出其拉伸及折叠的特性

单峰镜像logistic map)是种二次的多项式映射(递归关系式),是一个由简单非线性方程序产生混沌现象的经典范例。这种映射因生物学家Robert May在1976年发表的一篇论文而著名。单峰镜像原本被Pierre François Verhulst用作一个人口学模型,后来应用在物种受到限制因素之下的数目。数学上可写成

其中

单峰镜像是根据以下两个现象:

可是在特定初始条件及参数时,单峰镜像的人口模型会出现负的人口数,较早期使用的Ricker模型也有混沌现象,但没有这种问题。

r=4的单峰镜像是比特移动映射及参数μ=2的帐篷映射的非线性变换。

英语百科

Logistic map 单峰映象

Bifurcation diagram for the logistic map.
The attractor for any value of the parameter r is shown on the vertical line at that r.
Two- and three-dimensional  Poincaré plots show the stretching-and-folding structure of the logistic map
A cobweb diagram of the logistic map, showing chaotic behaviour for most values of r > 3.57

The logistic map is a polynomial mapping (equivalently, recurrence relation) of degree 2, often cited as an archetypal example of how complex, chaotic behaviour can arise from very simple non-linear dynamical equations. The map was popularized in a seminal 1976 paper by the biologist Robert May, in part as a discrete-time demographic model analogous to the logistic equation first created by Pierre François Verhulst. Mathematically, the logistic map is written

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