#' Reference function Derivative of Spherical Bessel function .
#'
#' @details The derivative of the Spherical Bessel function \eqn{j_n(x)}.
#' @param x The argument of the function
#' @param n The order of the function
#' @return The derivative \eqn{j_n'(x)}.
#' @include reff.sjn.r
#' @export
reff.sdj<-function(x,n){
a<-n/(2*n+1)
b<-(n+1)/(2*n+1)
return(a*reff.sjn(x,n-1)-b*reff.sjn(x,n+1))
}
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