Nothing
inClass = function(X,cls){
!is.null(oldClass(X)) && oldClass(X) == cls
}
#' Checks if a given object is a frequency domain matrix.
#'
#' @title Check if a given object is a frequency domain matrix
#' @param X an object
#' @return boolean
#' @export
is.freqdom = function (X){
inClass(X,'freqdom')
}
is.positiveint = function (n){
is.numeric(n) && n > 0
}
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