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#' @title Check whether a list contains NA or not.
#'
#' @param alist A list constructed by numeric vectors, which possibly contained in NAs.
#'
#' @return A logical, if list contains NA, then TRUE. And False for the others.
#' @export
#'
#' @examples
#'
#'#========================================================================================
#'# If a list does not contain NAs, then return TRUE
#'#========================================================================================
#'
#'#'d <- list(a=c(1,1),aa = c(2,2),aaa =c(3,3,3))
#'is_na_list(d)
#'
#'
#'
#'
#'
#'
#'
#'
#'#========================================================================================
#'# If a list contains NAs, then return TRUE
#'#========================================================================================
#'
#'d <- list(a=c(NA,1),aa = c(2,2),aaa =c(3,3,3))
#'is_na_list(d)
#'
#'
#'
#'
#'
#'#========================================================================================
#'# Note that a data frame is a list of equal-length vectors
#'#========================================================================================
#'
#'d <- is_na_list(data.frame(c(1,1)))
#'is_na_list(d)
#'
#'
#'d <- is_na_list(data.frame(c(1,NA)))
#'is_na_list(d)
#'
#'
#'
#'
#'
#'
#'
#'
is_na_list <- function(alist){
!as.logical(prod(!is.na(unlist( alist ))))
}
#
# d <- list(a=c(1,1),aa = c(2,2))
# is_na_list(d)
#
# d <- list(a=c(NA,1),aa = c(2,2))
# is_na_list(d)
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