DETVSF: Scale factor with time dependent linear decay.

In xegaDfGene: Gene Operations for Real-Coded Genes

Scale factor with time dependent linear decay.

Description

The scale factor is linear decaying from an upper bound to a lower bound with the number of generations. The scale factor is computed by UB-(UB-LB)*(t/T). See section 16.2 of Sharma et al. (2019), p.941 and Das et al. (2005).

Usage

DETVSF(lF)

Arguments

lF	Local configuration.

Details

The parameters are constant functions defined in lF:

1. UB is the upper bound of the scale factor (lF$ScaleFactor1).

2. LB is lower upper bound of the scale factor (lF$ScaleFactor2).

3. t is the current iteration (lF$cGeneration).

4. T is the total number of generations (lF$Generations).

A simple check shows that the formulas given in both papers are not correct.

Value

A scale factor.

References

Sharma, Prashant; Sharma, Harish; Kumar, Sandeep; Bansal, Jagdish Chand (2019): A Review on Scale Factor Strategies in Differential Evolution Algorithm. pp. 925-934. In: Bansal, Jagdish Chand et al. (2019) Soft Computing for Problem Solving. Advances in Intelligent Systems and Computing, Vol. 817. Springer, Singapore, 2019. (ISBN:978-981-13-1594-7)

Das, Swagatam; Konar, Amit; Chakraborty, Uday K. (2005): Two Improved Differential Evolution Schemes for Faster Global Search. pp. 991-998. In: Proceedings of the 7th Annual Conference on Genetic and Evolutionary Computation, Association for Computing Machinery, New York. (doi:10.1145/1068009.1068177)

See Also

Other Scale Factor: CauchySF(), ConstScaleFactor(), FitnessBasedSelfAdaptiveSF(), RandomGaussianSF(), UniformRandomScaleFactor(), UniformRandomScaleFactorDERSF()

Examples

parm<-function(x){function() {return(x)}}
lF<-list()
lF$ScaleFactor1<-parm(1.10)
lF$ScaleFactor2<-parm(0.5)
lF$Generations<-parm(4)
lF$cGeneration<-parm(0)
DETVSF(lF)
lF$cGeneration<-parm(1)
DETVSF(lF)
lF$cGeneration<-parm(2)
DETVSF(lF)
lF$cGeneration<-parm(3)
DETVSF(lF)
lF$cGeneration<-parm(4)
DETVSF(lF)

xegaDfGene documentation built on Aug. 22, 2025, 5:12 p.m.