2.1 类型

x <- "abc" # 数据对象
typeof(x) # 数据类型

## [1] "character"

mode(x) # 存储模式

## [1] "character"

storage.mode(x) # 存储类型

## [1] "character"

表 2.2: R/Rcpp 提供的基本数据类型
Value	R vector	Rcpp vector	Rcpp matrix	Rcpp scalar	C++ scalar
Logical	`logical`	`LogicalVector`	`LogicalMatrix`	-	`bool`
Integer	`integer`	`IntegerVector`	`IntegerMatrix`	-	`int`
Real	`numeric`	`NumericVector`	`NumericMatrix`	-	`double`
Complex	`complex`	`ComplexVector`	`ComplexMatrix`	`Rcomplex`	`complex`
String	`character`	`CharacterVector` (`StringVector`)	`CharacterMatrix` (`StringMatrix`)	`String`	`string`
Date	`Date`	`DateVector`	-	`Date`	-
Datetime	`POSIXct`	`DatetimeVector`	-	`Datetime`	`time_t`