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8193 ripley 1 
\name{abs}
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\title{Miscellaneous Mathematical Functions}
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\usage{
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abs(x)
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sqrt(x)
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}
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\alias{abs}
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\alias{sqrt}
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\description{
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These functions compute miscellaneous mathematical functions.
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The naming follows the standard for computer languages
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such as C or Fortran.
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}
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\arguments{
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  \item{x}{a numeric vector}
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}
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\details{
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  These are generic functions: methods can be defined for them
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  individually or via the \code{\link{Math}} group generic.
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}
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\seealso{
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\code{\link{Arithmetic}} for simple, \code{\link{log}} for logarithmic,
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\code{\link{sin}} for trigonometric, and \code{\link{Special}} for
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special mathematical functions.
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}
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\references{
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  Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988)
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  \emph{The New S Language}.
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  Wadsworth \& Brooks/Cole.
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}
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\examples{
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require(stats) # for spline
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xx <- -9:9
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plot(xx, sqrt(abs(xx)),  col = "red")
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lines(spline(xx, sqrt(abs(xx)), n=101), col = "pink")
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}
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\keyword{math}