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  (\eqn{ = \max vec}{ = max(vec)}), is \code{N - 1} as for all other
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  (\eqn{ = \max vec}{ = max(vec)}), is \code{N - 1} as for all other
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  values in the last interval.
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  values in the last interval.
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  \code{left.open = TRUE} is occasionally useful, e.g., for survival data.
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  \code{left.open = TRUE} is occasionally useful, e.g., for survival data.
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  For (anti-)symmetry reasons, it is equivalent to using
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  For (anti-)symmetry reasons, it is equivalent to using
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  \dQuote{mirrored} data, i.e., the following is always true: \preformatted{
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  \dQuote{mirrored} data, i.e., the following is always true:
- 
 
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  \preformatted{
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    identical(
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    identical(
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          findInterval( x,  v,      left.open= TRUE, ...) ,
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          findInterval( x,  v,      left.open= TRUE, ...) ,
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      N - findInterval(-x, -v[N:1], left.open=FALSE, ...) )
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      N - findInterval(-x, -v[N:1], left.open=FALSE, ...) )
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    }
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  }
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    where \code{N <- length(vec)} as above.
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  where \code{N <- length(vec)} as above.
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}
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}
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\value{
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\value{
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  vector of length \code{length(x)} with values in \code{0:N} (and
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  vector of length \code{length(x)} with values in \code{0:N} (and
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  \code{NA}) where \code{N <- length(vec)}, or values coerced to
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  \code{NA}) where \code{N <- length(vec)}, or values coerced to
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  \code{1:(N-1)} if and only if \code{all.inside = TRUE} (equivalently coercing all
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  \code{1:(N-1)} if and only if \code{all.inside = TRUE} (equivalently coercing all