1. Load code to R
(1) copy code to console
(2) put file into working directory, then source(“____.R”)
2. Operators
(1) <- : assignment operator
(2) # : hash symbol(comment)
(3) : : colon operator(integer sequence)
(4)+-*/^ : arithmetic operator
(5)> < ==: logical operator
>= <=
& | !
&& ||
3. R Objects
(1) classes: character, numeric, integer, complex, logical
(2) vector: class of elements must be same
(3) list: class of elements can be different
4. Sequence number
(1): create a sequence of numbers
(2)seq(from,to,by/length=,along.with=take the length from the length of this argument)
(3)seq_along()
(4)rep(,times/each=)
5. Vector
(1) c/vector()
List
(1) list()
6. Matrix </
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