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% File src/library/base/man/Syntax.Rd
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% File src/library/base/man/Syntax.Rd
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% Part of the R package, http://www.R-project.org
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% Part of the R package, http://www.R-project.org
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% Copyright 1995-2011 R Core Team
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% Copyright 1995-2012 R Core Team
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% Distributed under GPL 2 or later
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% Distributed under GPL 2 or later
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% = is treated specially in the parser: see PR#14595
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\name{Syntax}
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\name{Syntax}
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\alias{Syntax}
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\alias{Syntax}
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\title{Operator Syntax and Precedence}
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\title{Operator Syntax and Precedence}
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\description{
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\description{
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  Outlines \R syntax and gives the precedence of operators
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  Outlines \R syntax and gives the precedence of operators.
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}
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}
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\details{
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\details{
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  The following unary and binary operators are defined.  They are listed
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  The following unary and binary operators are defined.  They are listed
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  in precedence groups, from highest to lowest.
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  in precedence groups, from highest to lowest.
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  \tabular{ll}{
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  \tabular{ll}{
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    \code{!}\tab negation\cr
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    \code{!}\tab negation\cr
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    \code{&  &&}\tab and\cr
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    \code{&  &&}\tab and\cr
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    \code{| ||}\tab or\cr
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    \code{| ||}\tab or\cr
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    \code{~}\tab as in formulae\cr
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    \code{~}\tab as in formulae\cr
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    \code{-> ->>}\tab rightwards assignment\cr
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    \code{-> ->>}\tab rightwards assignment\cr
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    \code{=}\tab assignment (right to left)\cr
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    \code{<- <<-}\tab assignment (right to left)\cr
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    \code{<- <<-}\tab assignment (right to left)\cr
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    \code{=}\tab assignment (right to left)\cr
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    \code{?}\tab help (unary and binary)\cr
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    \code{?}\tab help (unary and binary)\cr
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  }
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  }
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  Within an expression operators of equal precedence are evaluated
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  Within an expression operators of equal precedence are evaluated
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  from left to right except where indicated.
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  from left to right except where indicated.  (Note that \code{=} is not
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  necessarily an operator.)
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  The binary operators \code{::}, \code{:::}, \code{$} and \code{@} require
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  The binary operators \code{::}, \code{:::}, \code{$} and \code{@} require
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  names or string constants on the right hand side, and the first two
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  names or string constants on the right hand side, and the first two
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  also require them on the left.
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  also require them on the left.
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