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sites

• 함수 정리 : https://doublet7411.blog.me/221487333230
• Training and Turning Parameters for Random Forest Using h2o Package
  • https://rpubs.com/chidungkt/449576

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Difference between library and require

• https://www.r-bloggers.com/2016/12/difference-between-library-and-require-in-r/
• require() : used inside functions
  • it gives a warning message and returns a logical value
    • FALSE if the requested package is not found
    • TRUE if the package is loaded
• It is better to use the library() as it gives the error message if the package is not found during the package loading time
  • This will indeed avoid unnecessary headaches of tracking down the errors caused while attempting to use the library routines which are not installed.
• library(xyz)
  • result : Error in library(xyz) : there is no package called ‘xyz’
• require(xyz)
  • result : Loading required package: xyz
  • Warning message:
    • In library(package, lib.loc = lib.loc, character.only = TRUE, logical.return = TRUE, :there is no package called ‘xyz’