演算子

> 1+2
[1] 3

用法の不明な演算子は、

> ?"+"

のようにすることで、ヘルプを確認できます。

算術演算子 (Arithmetic Operators)

演算子 機能
+ Plus, can be unary or binary
- Minus, can be unary or binary
* Multiplication, binary
/ Division, binary
%% Modulus, binary
%/% Integer divide, binary
^ Exponentiation, binary

関係演算子 (Relational Operators)

演算子 機能
== Equal to, binary
!=  
< Less than, binary
> Greater than, binary
>= Greater than or equal to, binary
<= Less than or equal to, binary

論理演算子 (Logical Operators)

演算子 機能
& And, binary, vectorized
| Or, binary, vectorized
! Unary not
&& And, binary, not vectorized
|| Or, binary, not vectorized

代入演算子 (Assignment Operator)

演算子 機能
<- Left assignment, binary
<<-
= ※1
-> Right assignment, binary
->>
※1 only allowed at the top level (e.g., in the complete expression typed at the command prompt) or as one of the subexpressions in a braced list of expressions. 
> a = 1 #
> print(a)
[1] 1

> b <- 2 #
> print(b)
[1] 2

> 3 -> c #
> print(c)
[1] 3
Variable Assignment - R Variables | TutorialsPoint

行列の乗法 (Matrix multiplication)

演算子 機能
%*% Matrix product, binary [行列積]
%o% Outer product, binary [外積]
%x% Kronecker product, binary [クロネッカー積]

X %o% Yは、outer(X, Y, FUN = "*", ...)と同等です。

X %x% Yは、kronecker(X, Y, FUN = "*", make.dimnames = FALSE, ...)と同等です。

その他

演算子 機能
~ Tilde, used for model formulae, can be either unary or binary
: Sequence, binary (in model formulae: interaction)
%x% Special binary operators, x can be replaced by any valid name
%in% Matching operator, binary (in model formulae: nesting)
$ List subset, binary
? Help

特殊演算子 (Special operators)

「%」で囲まれた演算子の総称で、ユーザー定義の中置演算子 (infix operators) を表します。

次の演算子は、baseパッケージで定義されています。

  • %%
  • %*%
  • %/%
  • %in%
  • %o%
  • %x%
10.3.4 Special operators - R Language Definition

magrittr

演算子 機能
%>% Pipe an object forward into a function or call expression.
%<>% Pipe an object forward into a function or call expression and update the lhs object with the resulting value.
%T>% Pipe a value forward into a function- or call expression and return the original value instead of the result.
%$% Expose the names in lhs to the rhs expression.

参考