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\value{
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\value{
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  A character vector of same length as \code{names} with each changed to
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  A character vector of same length as \code{names} with each changed to
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  a syntactically valid name.
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  a syntactically valid name.
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}
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}
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\details{
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\details{
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  A syntactically valid name consists of letters, numbers, and the dot
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  A syntactically valid name consists of letters, numbers and the dot or
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  character and starts with a letter or the dot.  Names such as
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  underline characters and starts with a letter or the dot not followed
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  \code{".2"} are not valid, and neither are the reserved words.
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  by a number.  Names such as \code{".2way"} are not valid, and neither
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  are the reserved words.
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  The character \code{"X"} is prepended if necessary.
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  The character \code{"X"} is prepended if necessary.
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  All invalid characters are translated to \code{"."}.  A missing value
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  All invalid characters are translated to \code{"."}.  A missing value
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  is translated to \code{"NA"}.  Names which match \R keywords have a dot
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  is translated to \code{"NA"}.  Names which match \R keywords have a dot
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  appended to them.  Duplicated values are altered by
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  appended to them.  Duplicated values are altered by