Nature-Inspired Optimization Algorithms by Yang Xin-She

Author:Yang, Xin-She
Language: eng
Format: epub
Publisher: Elsevier Science
Published: 2014-10-09T16:00:00+00:00

(8.4)

where is the attractiveness at . Since it is often faster to calculate than an exponential function, this function, if necessary, can conveniently be approximated as

(8.5)

It may be advantageous to use this approximation in some applications. Both (8.4) and (8.5) define a characteristic distance over which the attractiveness changes significantly from to for Eq. (8.4) or for Eq. (8.5).

In the actual implementation, the attractiveness function can be any monotonically decreasing functions such as the following generalized form:

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