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  subexpressions in a braced list of expressions.
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  subexpressions in a braced list of expressions.
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  The operators \code{<<-} and \code{->>} cause a search to made through
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  The operators \code{<<-} and \code{->>} cause a search to made through
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  the environment for an existing definition of the variable being
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  the environment for an existing definition of the variable being
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  assigned.  If such a variable is found then its value is redefined,
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  assigned.  If such a variable is found then its value is redefined,
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  otherwise assignment takes place globally. Note that their semantics
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  otherwise assignment takes place globally.  Note that their semantics
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  differ from that in the S language, but is useful in conjunction with
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  differ from that in the S language, but are useful in conjunction with
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  the scoping rules of \R.
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  the scoping rules of \R.
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  In all the assignment operator expressions, \code{x} can be a name
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  In all the assignment operator expressions, \code{x} can be a name
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  or an expression defining a part of an object to be replaced (e.g.,
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  or an expression defining a part of an object to be replaced (e.g.,
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  \code{z[[1]]}).  The name does not need to be quoted, though it can
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  \code{z[[1]]}).  The name does not need to be quoted, though it can