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R (workingdir (getwd(), File Change Dir, dir()), sequence (x<1:20),…

- - - - default
    - - Put L to say number
      - Inf
        
        Infinity
      - NAn
        
        Not a number
    - - object of same class
      - list - element can contain different objects
        
        x<-list(1,"a",TRUE,1+3i)
      - vector()
        
        class of obj
        
        length of arg
      - vector(class, length)
      - c()
      - mixing objects -LCD
        
        coercion happens
        
        as.type()
        
        explicit coercion
        
        as.numeric(vector)
        
        as.character(x)