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#####phiP#####
# Compute the phiP criterion
# (Lp norm of the sum of the inverses of the design inter-point distances)
# Reference: Pronzato, L. and Muller, W.,2012, Design of computer experiments:
# space filling and beyond, Statistics and Computing, 22:681-701.
# A higher phiP corresponds to a more regular scaterring of design points
#---------------------------------------------------------------------------|
#args : design : the design |
# p : the "p" in the Lp norm which is taken (default=50) |
#out : the phiP criterion |
#---------------------------------------------------------------------------|
phiP<-function(design,p=50)
{
D<-dist(design)
D<-D^(-p)
fi_p<-(sum(D))^(1/p)
return(fi_p)
}
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