What are the knowledge points of R language expressions?
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The structure of the combination expression provided by r:
semicolon
Parenthesis
Curly braces
Separated type expression
X = 1
Y = 2
Z = 3
X = 1; y = 2; z = 3
Parenthesis
Parentheses return the execution result of the expression in parentheses
Curly braces
Curly braces are used to execute some column expressions (separated by line breaks or semicolons) and return the execution result of the last expression
{expression_1; expression_2;...; expression_}
(note: the symbol in the curly braces of the function is equivalent to a local variable)
The underlying operation of curly braces is to call {}
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