#' fts2knots
#'
#' Conversion from feet per second to knots per second.
#'
#' @param fts numeric Speed in feets per second.
#' @return knots per second
#'
#'
#' @author Istituto per la Bioeconomia CNR Firenze Italy Alfonso Crisci \email{alfonso.crisci@@ibe.cnr.it}
#' @keywords fts2knots
#'
#' @export
#'
#'
#'
#'
fts2knots=function(fts) {
ct$assign("fts", as.array(fts))
ct$eval("var res=[]; for(var i=0, len=fts.length; i < len; i++){ res[i]=fts2knots(fts[i])};")
res=ct$get("res")
return(ifelse(res==9999,NA,res))
}
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