R語言-檢視變數及資料型態所佔記憶體容量，零成本提高計算效率

原始文章

來吧，直接複製貼上

check_file_size <- function(name){



  size <- object.size(get(name))



  # 4496535920 bytes = 4496 mb

  if(size >= 1000000){

    unit_size <- 1000000

    unit <- "mb"

  }else if(size >= 1000){

    unit_size <- 1000

    unit <- "kb"

  }else{

    unit_size <- 1

    unit <- "byte"

  }



  size <- size / unit_size

  size <- round(size)

  cat(paste0(name, " ", size, " ", unit))

}

檢查資料型態(Data Type)的容量大小

# Compare Date and Number

> t1 <- Sys.Data()

> t2 <- 20200101

> check_file_size("t1", unit = "byte")

t1 256 byte

> check_file_size("t2",unit = "byte")

t2 48 byte



# Compare numeric and character for ID

> test <- as.numeric(870576)

> test2 <- as.character(870576)

> check_file_size("test", unit = "byte")

test 48 byte

> check_file_size("test2", unit = "byte")

test2 96 byte