#' kmh2fts
#'
#' Conversion from kilometer per hour to feets per second.
#'
#' @param kmh numeric Speed in kilometer per hour.
#' @return feets per second
#'
#'
#' @author Istituto per la Bioeconomia CNR Firenze Italy Alfonso Crisci \email{alfonso.crisci@@ibe.cnr.it}
#'
#' @export
#'
#'
#'
#'
kmh2fts=function(kmh) {
ct$assign("kmh", as.array(kmh))
ct$eval("var res=[]; for(var i=0, len=kmh.length; i < len; i++){ res[i]=kmh2fts(kmh[i])};")
res=ct$get("res")
return(ifelse(res==9999,NA,res))
}
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