#' random forest cv
#'
#' fonisce le previsioni della cv, da utilizzare dentro sapply(1:k,...)
#'
#' @param i i-esimo fold
#' @param formula formula del modello
#' @param folds prodotto da kfold function
#' @param y vettore. variabile risposta
#' @param mtry
#' @param x matrice variabili esplicative
#'
#' @export
randomforest_crossvalidation<-function(i,formula=NULL,y,x,folds,mtry=if (!is.null(y) && !is.factor(y))
max(floor(ncol(x)/3), 1) else floor(sqrt(ncol(x)))){
if(class(formula)=='NULL'){
m<- randomForest(x= x[-folds[[i]],],y=y[-folds[[i]]], mtry=mtry)
}
else
{
formula<-as.formula(formula)
m<- randomForest(formula,data=x[-folds[[i]],], mtry=mtry)
}
pred <- predict(m, newdata = x[folds[[i]],],type='prob')[,2]
pred
}
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