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#' Estimated densities (PN)
#'
#' @description Plot the estimated density or log-density (PN)
#'
#' @usage pn.dens(x, model, log=FALSE, ylab=NULL, xlab = NULL, main = NULL, ...)
#'
#'@param x the response vector
#'@param model a variable returned by \code{\link{pn.mle}}
#'@param log Logical, plot log-density if TRUE (default = FALSE)
#'@param ylab Title of the ylab, if NULL default is selected
#'@param xlab Title of the xlab, if NULL default is selected
#'@param main Main Title, if NULL default is selected
#'@param ... further arguments to \cite{\link{plot}}
#'
#' @export
pn.dens <- function(x, model, log=FALSE, ylab=NULL, xlab = NULL, main = NULL, ...){
alpha <- model$alpha
dados <- as.matrix(x)
if (dim(dados)[2] != 1) stop("The pn.dens function is only appropriate for the univariate analysis.\n")
if(length(ylab) == 0) ylab = "Density"
if(length(xlab) == 0) xlab = "x"
if(length(main) == 0){
main <- "Density plot"
if(log) main <- "log-density plot"
}
lim <- -9
xx=seq(min(dados),max(dados),(max(dados)-min(dados))/1000)
if(!log) plot(xx,pn.d(xx, alpha ),type="l",ylab=ylab, xlab = xlab, main = main, ...)
else{
aux <- log(pn.d(xx, alpha))
aux[which(aux < lim)] <- NA
plot(xx,aux,type="l",ylab=ylab, xlab = xlab, main = main, ...)
}
}
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