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HillP<-function(rasterm, w, alpha, na.tolerance,debugging){
#
## Reshape values
#
values<-as.numeric(as.factor(rasterm))
rasterm_1<-matrix(data=values,nrow=dim(rasterm)[1],ncol=dim(rasterm)[2])
#
## Add additional columns and rows to match moving window
#
hor<-matrix(NA,ncol=dim(rasterm)[2],nrow=w)
ver<-matrix(NA,ncol=w,nrow=dim(rasterm)[1]+w*2)
trasterm<-cbind(ver,rbind(hor,rasterm_1,hor),ver)
window = 2*w+1
rm(hor,ver,rasterm_1,values); gc()
#
## Progression bar
#
pb <- txtProgressBar(min = (1+w), max = dim(rasterm)[2], style = 3)
progress <- function(n) setTxtProgressBar(pb, n)
opts <- list(progress = progress)
#
## Start the parallelized loop over iter
#
HillOP <- foreach(cl=(1+w):(dim(rasterm)[2]+w),.options.parallel = opts,.verbose = F) %dopar% {
if(debugging) {
cat(paste(cl))
}
HillOut <- sapply((1+w):(dim(rasterm)[1]+w), function(rw) {
if( length(!which(!trasterm[c(rw-w):c(rw+w),c(cl-w):c(cl+w)]%in%NA)) < window^2-((window^2)*na.tolerance) ) {
vv<-NA
return(vv)
}
else {
tw <- summary(as.factor(trasterm[c(rw-w):c(rw+w),c(cl-w):c(cl+w)]),maxsum=10000)
if( "NA's"%in%names(tw) ) {
tw <- tw[-length(tw)]
}
if( debugging ) {
message("Hill - parallelized\nWorking on coords ",rw,",",cl,". classes length: ",length(tw),". window size=", window)
}
tw_labels <- names(tw)
tw_values <- as.vector(tw)
p <- tw_values/sum(tw_values)
vv <- drop(sum(p^alpha))^(1/(1-alpha))
return(vv)
}
})
return(HillOut)
}
return(HillOP)
}
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