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  A vector of the same length as \code{x} containing the transformed
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  A vector of the same length as \code{x} containing the transformed
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  values.  \code{log(0)} gives \code{-Inf}, and \code{log(x)} for
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  values.  \code{log(0)} gives \code{-Inf}, and \code{log(x)} for
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  negative values of \code{x} is \code{NaN}.  \code{exp(-Inf)} is \code{0}.
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  negative values of \code{x} is \code{NaN}.  \code{exp(-Inf)} is \code{0}.
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  For complex inputs to the log functions, the value is a complex number
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  For complex inputs to the log functions, the value is a complex number
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  with imaginary part in the range \eqn{[-\pi, \pi]}{[-pi, pi]}: which
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  with imaginary part in the range \eqn{[-\pi, \pi]}: which
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  end of the range is used might be platform-specific.
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  end of the range is used might be platform-specific.
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}
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}
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\details{
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\details{
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  All except \code{logb} are generic functions: methods can be defined
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  All except \code{logb} are generic functions: methods can be defined
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  for them individually or via the \code{\link[=S3groupGeneric]{Math}}
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  for them individually or via the \code{\link[=S3groupGeneric]{Math}}