R class() function
kodingwindow@kw:~$ R
...
> class(1)
[1] "numeric"

> class(TRUE)
[1] "logical"

> class(F)
[1] "logical"

> class(matrix())
[1] "matrix"

> class("Kodingwindow")
[1] "character"

> class(Sys.time())
[1] "POSIXct" "POSIXt" 

> class(15L)
[1] "integer"

> class(15+9i)
[1] "complex"

> class(charToRaw("Hello World"))
[1] "raw"
R typeof() function
> typeof(1)
[1] "double"

> typeof(1.1)
[1] "double"

> typeof("Kodingwindow")
[1] "character"

> typeof(1L)
[1] "integer"

> typeof(TRUE)
[1] "logical"

> typeof(F)
[1] "logical"

> typeof(-3+4i)
[1] "complex"

> typeof(raw())
[1] "raw"

> typeof(NULL)
[1] "NULL"
R round() function
> round(3.14)
[1] 3

> round(9.87)
[1] 10

> round(3.141492,digits=3)
[1] 3.141

> raw(10)
[1] 00 00 00 00 00 00 00 00 00 00
R sample() function
> sample(1:36)
 [1]  9 15 20 16  3 30 26  4  5 10 33 36 24 32 12 19 22  8 13 34  2 35 23 18 29
[26]  1 14 17  6  7 28 31 11 27 25 21

> sample(1:36,size=1)
[1] 2

> sample(1:36,size=1)
[1] 16

> sample(1:36,size=1)
[1] 5

> sample(1:36,size=5)
[1]  7 13 33  6 22
R replicate() function
> replicate(3,'Kodingwindow')
[1] "Kodingwindow" "Kodingwindow" "Kodingwindow"

> replicate(3,1:6)
     [,1] [,2] [,3]
[1,]    1    1    1
[2,]    2    2    2
[3,]    3    3    3
[4,]    4    4    4
[5,]    5    5    5
[6,]    6    6    6
R format() function
> format(3.141492,digits=3)
[1] "3.14"

> format("Kodingwindow",width=20)
[1] "Kodingwindow        "

> format("Kodingwindow",width=20,justify="")
Error in match.arg(justify) : 
  'arg' should be one of “left”, “right”, “centre”, “none”

> format("Kodingwindow",width=20,justify="l")
[1] "Kodingwindow        "

> format("Kodingwindow",width=20,justify="c")
[1] "    Kodingwindow    "

> format("Kodingwindow",width=20,justify="r")
[1] "        Kodingwindow"

> format("Kodingwindow",width=20,justify="n")
[1] "Kodingwindow"
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