swirl 1: Basic Building Blocks
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swirl 1 Basic Building Blocks
help.start() 帮助命令
?c 查询特定函数sqrt()
abs()
If the length of the shorter vector does not divide evenly into the length of the longer vector, R will still
| apply the 'recycling' method, but will throw a warning to let you know something fishy might be going on.
两个vector运算,短的不能被长的整除,短的补长至跟长的vector一致。
You can type the first two letters of the variable name, then hit the Tab key (possibly more than once). Most
| programming environments will provide a list of variables that you've created that begin with 'my'. This is called
| auto-completion and can be quite handy when you have many variables in your workspace.
自动补全,输入first two letters,单击/双击Tab
另,补充数据类型
0 0
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