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  \item{x}{a numeric or complex vector.}
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  \item{x}{a numeric or complex vector.}
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  \item{base}{a positive or complex number: the base with respect to which
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  \item{base}{a positive or complex number: the base with respect to which
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    logarithms are computed.  Defaults to \eqn{e}=\code{exp(1)}.}
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    logarithms are computed.  Defaults to \eqn{e}=\code{exp(1)}.}
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  }
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  }
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\description{
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\description{
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  \code{log} computes logarithms, by default natural logarithms,
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  \code{log} computes logarithms, by default natural logarithms,
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  \code{log10} computes common (i.e., base 10) logarithms, and
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  \code{log10} computes common (i.e., base 10) logarithms, and
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  \code{log2} computes binary (i.e., base 2) logarithms.
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  \code{log2} computes binary (i.e., base 2) logarithms.
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  The general form \code{log(x, base)} computes logarithms with base
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  The general form \code{log(x, base)} computes logarithms with base
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  \code{base}.
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  \code{base}.
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  \code{log} will be used).
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  \code{log} will be used).
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  \code{logb} is a wrapper for \code{log} for compatibility with S.  If
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  \code{logb} is a wrapper for \code{log} for compatibility with S.  If
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  (S3 or S4) methods are set for \code{log} they will be dispatched.
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  (S3 or S4) methods are set for \code{log} they will be dispatched.
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  Do not set S4 methods on \code{logb} itself.
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  Do not set S4 methods on \code{logb} itself.
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  All except \code{log} are \link{primitive} functions.
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  All except \code{log} are \link{primitive} functions.
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}
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}
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\section{S4 methods}{
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\section{S4 methods}{
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  \code{exp}, \code{expm1}, \code{log}, \code{log10}, \code{log2} and
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  \code{exp}, \code{expm1}, \code{log}, \code{log10}, \code{log2} and
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  \code{log1p} are S4 generic and are members of the
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  \code{log1p} are S4 generic and are members of the