R/nums.R

In okgreece/OBeU: Cluster Analysis 'OpenBudgets.eu'

#' @title 
#' Select the numeric columns of a given dataset
#'  
#' @description
#' Extract and return a data frame with the columns that include only numeric values
#' 
#' @usage nums(data)
#' 
#' @param data The input data frame, matrix
#' 
#' @return This function returns a data frame with the numeric columns of the input dataset.
#' @examples 
#' nums(city_data)
#' @author Kleanthis Koupidis
#' @rdname nums
#' 
#' @export
#' 

nums <- function(data) {
  
  data <- as.data.frame(data)
  
  if(ncol(data) >= 2) {
    num <- sapply(data, is.numeric)
    data.num <- data[num]
    data.num <- as.data.frame(data.num)
    
  } else {
    data.num <- data
  }
  return(data.num)
}