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# Copyright (C) 2008-2009 - INRIA - Michael Baudin
# Copyright (C) 2009-2010 - DIGITEO - Michael Baudin
# Copyright (C) 2010-2022 - Sebastien Bihorel
#
# This file must be used under the terms of the CeCILL.
# This source file is licensed as described in the file COPYING, which
# you should have received as part of this distribution. The terms
# are also available at
# http://www.cecill.info/licences/Licence_CeCILL_V2-en.txt
#
# This source code is a R port of the optimsimplex component
# originally written by Michael Baudin for Scilab.
optimsimplex.size <- function(this=NULL,method=NULL){
n <- this$n
nv <- this$nbve
if (is.null(method)) method <- 'sigmaplus'
if (!any(method==c('Nash','sigmaplus','sigmaminus')))
stop(sprintf('optimsimplex.size: Unknown simplex size method %s', method))
if (method=='Nash'){
v1 <- matrix(rep(this$x[1,],nv-1),nrow=nv-1,byrow=TRUE)
edges <- this$x[2:nv,,drop=FALSE] - v1
abedges <- abs(edges)
n1 <- apply(abedges,1,sum)
ssize <- sum (n1)
}
if (method=='diameter'){
ssize <- 0.0
for (i in 1:nv){
vi <- matrix(rep(this$x[i,],nv),nrow=nv,byrow=TRUE)
edges <- vi - this$x[1:nv,,drop=FALSE]
n2 <- sqrt(apply(edges^2,1,sum))
ssize <- max(c(max(n2),ssize))
}
}
if (method=='sigmaplus'){
v1 <- matrix(rep(this$x[1,],nv-1),nrow=nv-1,byrow=TRUE)
edges <- this$x[2:nv,,drop=FALSE] - v1
n2 <- sqrt(apply(edges^2,1,sum))
ssize <- max(n2)
}
if (method=='sigmaminus'){
v1 <- matrix(rep(this$x[1,],nv-1),nrow=nv-1,byrow=TRUE)
edges <- this$x[2:nv,,drop=FALSE] - v1
n2 <- sqrt(apply(edges^2,1,sum))
ssize <- min(n2)
}
return(ssize)
}
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