Intermediate R

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R语言Intermediate level指令,主要参考datacamp练习和Coursera上JHU课程

some useful instructions

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tab可以补全之前输入的命令
上箭头可以返回上一次输入的命令
## logical operator
&:and # && only test the first element;3 < x < 7 to check if x is between 3 and 7 will not work; you'll need 3 < x & x < 7 for that.
|:or #|| only test the first element
!:not #!!only test the first element

conditional statements

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if(condition) {
  expr
} else if(condition2) {
  expr2
} else {
  expr3
}