#' Compute p-value of two distributions not centered at zero
#' @param dens1 density 1
#' @param dens2 density 2
#' @param alternative alternative pdf
#' @export
#' @return compared pdf
compareTwoDistsFaster <-function(dens1=runif(256*8,0,1), dens2=runif(256*8,0,1),alternative="two.sided"){
if(length(dens1)>1 & length(dens2)>1 ){
dens1<-dens1/sum(dens1)
dens2<-dens2/sum(dens2)
cum2 <- cumsum(dens2)-dens2/2
tmp<- sum(sapply(1:length(dens1),function(i)return(dens1[i]*cum2[i])))
if(alternative=="two.sided"){
if(tmp>0.5)tmp<-tmp-1
return( tmp*2 )
}
if(alternative=="less"){return(1-tmp)}
return(tmp)
}
else {
return(NA)
}
}
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