#' knots2kmh
#'
#' Conversion from knot per second to kilometers per hour.
#'
#' @param knots numeric Speed in knots per second.
#' @return kilometers per hour
#'
#'
#' @author Istituto per la Bioeconomia CNR Firenze Italy Alfonso Crisci \email{alfonso.crisci@@ibe.cnr.it}
#' @keywords knots2kmh
#'
#' @export
#'
#'
#'
#'
knots2kmh=function(knots) {
ct$assign("knots", as.array(knots))
ct$eval("var res=[]; for(var i=0, len=knots.length; i < len; i++){ res[i]=knots2kmh(knots[i])};")
res=ct$get("res")
return(ifelse(res==9999,NA,res))
}
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